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Genetic trends for fertility, udder health and protein yield in Swedish red cattle estimated with different models
Summary The aim of this study was to estimate and compare genetic trends in Swedish Red cattle using a full multiple‐trait (MT) model and trait‐group‐wise models for female fertility, udder health and protein yield. Field data for maiden heifers from 1989 and cows with a first and second lactation between 1990 and 2007 were included. (Co)variance components were estimated prior to prediction of breeding values. The estimated genetic trends were clearly favourable for protein yield and udder conformation, and in most cases neutral to favourable for clinical mastitis and calving to first insemination. In maiden heifers...
Source: Journal of Animal Breeding and Genetics - February 1, 2017 Category: Genetics & Stem Cells Authors: S. Eriksson, K. Johansson, H. Hansen Axelsson, W.F. Fikse Tags: ORIGINAL ARTICLE Source Type: research

The legacy of Columbus in American horse populations assessed by microsatellite markers
In this study, 25 autosomal microsatellites were genotyped in 50 horse breeds representing Criollo populations from 12 American countries (27 breeds), breeds from the Iberian Peninsula (19), one breed each from France and Morocco and two cosmopolitan horse breeds (Thoroughbred and Arabian). The genetic relationships among breeds identified five clusters: Celtic; Iberian; North American with Thoroughbred influence; most Colombian breeds; and nearly all other Criollo breeds. The group of “all other Criollo breeds” had the closest genetic relationship with breeds originating from the Iberian Peninsula, specifically with t...
Source: Journal of Animal Breeding and Genetics - February 1, 2017 Category: Genetics & Stem Cells Authors: O. Cort és, S. Dunner, L.T. Gama, A.M. Martínez, J.V. Delgado, C. Ginja, L.M. Jiménez, J. Jordana, C. Luis, M.M. Oom, D.P. Sponenberg, P. Zaragoza, , J.L. Vega‐Pla Tags: ORIGINAL ARTICLE Source Type: research

Performance of genomic selection under a single ‐step approach in autochthonous Spanish beef cattle populations
This study evaluated different strategies for implementing a single‐step genomic selection programme in two autochthonous Spanish beef cattle populations (Pirenaica—Pi and Rubia Gallega—RG). The strategies were compared in terms of accuracy attained under different scenarios by simulating genomic data over the known genealogy. Several genotyping approaches were tested, as well as, other factors like marker density, effective population size, mutation rate and heritability of the trait. The results obtained showed gains in accuracy with respect to pedigree BLUP evaluation in all cases. The greatest benefit was obtaine...
Source: Journal of Animal Breeding and Genetics - February 1, 2017 Category: Genetics & Stem Cells Authors: E. ‐F. Mouresan, J. Altarriba, C. Moreno, S. Munilla, A. González‐Rodríguez, L. Varona Tags: ORIGINAL ARTICLE Source Type: research

Daniel Gianola's contributions to animal breeding and quantitative genetics, a vuelo de p ájaro
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - January 30, 2017 Category: Genetics & Stem Cells Authors: D. Sorensen, G. Campos Tags: ORIGINAL ARTICLE Source Type: research

Effective breeding programmes down under
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - January 10, 2017 Category: Genetics & Stem Cells Authors: J. Werf, R. Banks Tags: EDITORIAL Source Type: research

Mitochondrial DNA D ‐loop haplogroup contributions to the genetic diversity of East European domestic chickens from Russia
Summary To elucidate geographical and historical aspects of chicken dispersal across Eastern Europe, we analysed the complete mitochondrial DNA D‐loop sequence of 86 representatives from chicken breeds traditionally raised in the territory of the East European Plain (Orloff, Pavlov, Russian White, Yurlov Crower, Uzbek Game and Naked Neck). From the 1231–1232 bp D‐loop sequence, 35 variable sites that defined 22 haplotypes were identified in modern chicken. All populations, except Uzbek Game, exhibited high values of haplotype and nucleotide diversity suggesting a wide variation in maternal diversity. Inclusion of mt...
Source: Journal of Animal Breeding and Genetics - December 18, 2016 Category: Genetics & Stem Cells Authors: A.G. Dyomin, M.I. Danilova, J.M. Mwacharo, A.E. Masharsky, A.V. Panteleev, A.S. Druzhkova, V.A. Trifonov, S.A. Galkina Tags: Original Article Source Type: research

Genetic diversity of the Mexican Lidia bovine breed and its divergence from the Spanish population
In conclusion, as the Mexican Lidia population had initially a small number of founders and its current population has been reared isolated from their Spanish ancestors since a long time, these bottleneck effects and a combination of mixed cattle origin are the factors that might erase any trace of the Spanish origin of this population. (Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - December 1, 2016 Category: Genetics & Stem Cells Authors: P.G. Eusebi, O. Cort és, S. Dunner, J. Cañón Tags: ORIGINAL ARTICLE Source Type: research

Improving production efficiency in the presence of genotype by environment interactions in pig genomic selection breeding programmes
Summary We simulated a genomic selection pig breeding schemes containing nucleus and production herds to improve feed efficiency of production pigs that were cross‐breed. Elite nucleus herds had access to high‐quality feed, and production herds were fed low‐quality feed. Feed efficiency in the nucleus herds had a heritability of 0.3 and 0.25 in the production herds. It was assumed the genetic relationships between feed efficiency in the nucleus and production were low (rg = 0.2), medium (rg = 0.5) and high (rg = 0.8). In our alternative breeding schemes, different proportion of production animals were recorded ...
Source: Journal of Animal Breeding and Genetics - December 1, 2016 Category: Genetics & Stem Cells Authors: K.G. Nirea, T.H.E. Meuwissen Tags: Original Article Source Type: research

Genomic evaluation of regional dairy cattle breeds in single ‐breed and multibreed contexts
Summary An important prerequisite for high prediction accuracy in genomic prediction is the availability of a large training population, which allows accurate marker effect estimation. This requirement is not fulfilled in case of regional breeds with a limited number of breeding animals. We assessed the efficiency of the current French routine genomic evaluation procedure in four regional breeds (Abondance, Tarentaise, French Simmental and Vosgienne) as well as the potential benefits when the training populations consisting of males and females of these breeds are merged to form a multibreed training population. Genomic ev...
Source: Journal of Animal Breeding and Genetics - December 1, 2016 Category: Genetics & Stem Cells Authors: D. J ónás, V. Ducrocq, S. Fritz, A. Baur, M.‐P. Sanchez, P. Croiseau Tags: Original Article Source Type: research

Genetic parameter estimates for prenatal and postnatal mortality in Nellore cattle
Summary The aim of this study was to estimate genetic parameters for prenatal (PRE) and postnatal (POS) mortality in Nellore cattle. A total of 13 141 (PRE) and 17 818 (POS) records from Nellore females were used. PRE and POS were recorded using binary scale scores: a score of ‘1’ was given to calves that were born alive (PRE) and those that were alive at weaning (POS), and a score of ‘0’ was given to calves that were not alive at or around birth (PRE), as well as to those weighed at birth but not at weaning (POS). The relationship matrix included 698 sires, 107 paternal grandsires and 69 maternal grandsires. Dat...
Source: Journal of Animal Breeding and Genetics - December 1, 2016 Category: Genetics & Stem Cells Authors: L.C. Magalh ães Silva, F. Baldi, C. Aboujaoude, G.C. Venturini, L.G. Albuquerque, M.J.R. Paranhos da Costa Tags: Original Article Source Type: research

Estimation of total genetic effects for survival time in crossbred laying hens showing cannibalism, using pedigree or genomic information
Summary Mortality of laying hens due to cannibalism is a major problem in the egg‐laying industry. Survival depends on two genetic effects: the direct genetic effect of the individual itself (DGE) and the indirect genetic effects of its group mates (IGE). For hens housed in sire‐family groups, DGE and IGE cannot be estimated using pedigree information, but the combined effect of DGE and IGE is estimated in the total breeding value (TBV). Genomic information provides information on actual genetic relationships between individuals and might be a tool to improve TBV accuracy. We investigated whether genomic information of...
Source: Journal of Animal Breeding and Genetics - November 23, 2016 Category: Genetics & Stem Cells Authors: T. Brinker, B. Raymond, P. Bijma, A. Vereijken, E.D. Ellen Tags: Original Article Source Type: research

Acknowledgements to referees
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - November 16, 2016 Category: Genetics & Stem Cells Tags: Acknowledgements to Referees Source Type: research

The frontier spirit and reproducible research in animal breeding
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - November 16, 2016 Category: Genetics & Stem Cells Authors: R. J. Tempelman Tags: Editorial Source Type: research

Merging pedigree databases to describe and compare mating practices and gene flow between pedigree dogs in France, Sweden and the UK
In conclusion, the potential to reduce inbreeding within purebred dog populations through exchanging breeding animals across countries was confirmed by an improved effective population size when merging populations from different countries. (Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - October 1, 2016 Category: Genetics & Stem Cells Authors: S. Wang, G. Leroy, S. Malm, T. Lewis, E. Strandberg, W.F. Fikse Tags: Original Article Source Type: research

Genetic correlations between dressage, show jumping and studbook ‐entry inspection traits in a process of specialization in Dutch Warmblood horses
This study aimed to estimate genetic parameters to support decision‐making on specialization of breeding horses for dressage and show jumping in Dutch warmblood horses. Genetic correlations between performance of horses in dressage and show jumping were estimated as well as the genetic correlation between traits recorded during studbook‐entry inspections and performance in dressage and show jumping competitions. The information on competition comprised the performance of 82 694 horses in dressage and 62 072 horses in show jumping, recorded in the period 1993–2012. For 26 056 horses, information was available for b...
Source: Journal of Animal Breeding and Genetics - September 28, 2016 Category: Genetics & Stem Cells Authors: G. Rovere, B.J. Ducro, J.A.M. Arendonk, E. Norberg, P. Madsen Tags: Original Article Source Type: research

Estimates of the actual relationship between half ‐sibs in a pig population
Summary Genomic relationships based on markers capture the actual instead of the expected (based on pedigree) proportion of genome shared identical by descent (IBD). Several methods exist to estimate genomic relationships. In this research, we compare four such methods that were tested looking at the empirical distribution of the estimated relationships across 6704 pairs of half‐sibs from a cross‐bred pig population. The first method based on multiple marker linkage analysis displayed a mean and standard deviation (SD) in close agreement with the expected ones and was robust to changes in the minor allele frequencies (...
Source: Journal of Animal Breeding and Genetics - September 27, 2016 Category: Genetics & Stem Cells Authors: C.A. Garc ía‐Baccino, S. Munilla, A. Legarra, Z.G. Vitezica, N.S. Forneris, R.O. Bates, C.W. Ernst, N.E. Raney, J.P. Steibel, R.J.C. Cantet Tags: Original Article Source Type: research

Use of molecular markers to improve relationship information in the genetic evaluation of beef cattle tick resistance under pedigree ‐based models
Summary The selection of genetically superior individuals is conditional upon accurate breeding value predictions which, in turn, are highly depend on how precisely relationship is represented by pedigree. For that purpose, the numerator relationship matrix is essential as a priori information in mixed model equations. The presence of pedigree errors and/or the lack of relationship information affect the genetic gain because it reduces the correlation between the true and estimated breeding values. Thus, this study aimed to evaluate the effects of correcting the pedigree relationships using single‐nucleotide polymorphism...
Source: Journal of Animal Breeding and Genetics - September 23, 2016 Category: Genetics & Stem Cells Authors: V.S. Junqueira, F.F. Cardoso, M.M. Oliveira, B.P. Sollero, F.F. Silva, P.S. Lopes Tags: Original Article Source Type: research

Estimation of genetic (co)variances of Gompertz growth function parameters in pigs
The objective of this study was to estimate genetic (co)variances for the Gompertz growth function parameters, asymptotic mature weight (A), the ratio of mature weight to birthweight (B) and rate of maturation (k), using alternative modelling approaches. The data set consisted of 51 893 live weight records from 10 201 growing pigs. The growth of each pig was modelled using the Gompertz model employing either a two‐step fixed effect or mixed model approach or a one‐step mixed model approach using restricted maximum likelihood for the estimation of genetic (co)variance. Heritability estimates for the Gompertz growth fu...
Source: Journal of Animal Breeding and Genetics - September 14, 2016 Category: Genetics & Stem Cells Authors: J.M. Coyne, K. Matilainen, D.P. Berry, M. – L. Sevon‐Aimonen, E.A. Mäntysaari, J. Juga, T. Serenius, N. McHugh Tags: Original Article Source Type: research

Novel harmful recessive haplotypes for reproductive traits in pigs
Summary Harmful recessive haplotypes for reproductive and fertility traits have previously been detected in cattle, but so far, no studies have been published for pigs. The aim of this study was to locate chromosomal regions with putative lethal haplotypes and estimate the effects of the identified haplotypes on reproductive traits in the Finnish Yorkshire pig breed. We used marker genotypes of 871 Finnish Yorkshire AI boars, genotyped with Illumina's PorcineSNP60 BeadChip. The analysed traits were number of stillborn piglets in first (NSB1) and later (NSB2) parities, total number of piglets born in first and later paritie...
Source: Journal of Animal Breeding and Genetics - September 13, 2016 Category: Genetics & Stem Cells Authors: J. H äggman, P. Uimari Tags: Original Article Source Type: research

Estimation of genetic variance in the age of genomics
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - September 12, 2016 Category: Genetics & Stem Cells Authors: J. Jensen Tags: Editorial Source Type: research

Genome ‐wide association study for milk somatic cell score in holstein cattle using copy number variation as markers
Summary Mastitis, the most common and expensive disease in dairy cows, implies significant losses in the dairy industry worldwide. Many efforts have been made to improve genetic mastitis resistance in dairy populations, but low heritability of this trait made this process not as effective as desired. The purpose of this study was to identify genomic regions explaining genetic variation of somatic cell count using copy number variations (CNVs) as markers in the Holstein population, genotyped with the Illumina BovineHD BeadChip. We found 24 and 47 copy number variation regions significantly associated with estimated breeding...
Source: Journal of Animal Breeding and Genetics - August 1, 2016 Category: Genetics & Stem Cells Authors: M. Dur án Aguilar, S.I. Román Ponce, F.J. Ruiz López, E. González Padilla, C.G. Vásquez Peláez, A. Bagnato, M.G. Strillacci Tags: Original Article Source Type: research

Sensitivity of breeding values for carcass traits of meat ‐type quail to changes in dietary (methionine + cystine):lysine ratio using reaction norm models
Summary Our objective was to evaluate changes in breeding values for carcass traits of two meat‐type quail (Coturnix coturnix) strains (LF1 and LF2) to changes in the dietary (methionine + cystine):lysine ([Met + Cys]:Lys) ratio due to genotype by environment (G × E) interaction via reaction norm. A total of 7000 records of carcass weight and yield were used for analyses. During the initial phase (from hatching to day 21), five diets with increasing (Met + Cys):Lys ratios (0.61, 0.66, 0.71, 0.76 and 0.81), containing 26.1% crude protein and 2900 kcal ME/kg, were evaluated. Analyses were performed using random ...
Source: Journal of Animal Breeding and Genetics - August 1, 2016 Category: Genetics & Stem Cells Authors: J.A. Miranda, A.V. Pires, L.R.A. Abreu, L.F.M. Mota, M.A. Silva, C.M. Bonaf é, H.J.D. Lima, P.G.M.A. Martins Tags: Original Article Source Type: research

Genetic analyses of herding traits in the Border Collie using sheepdog trial data
Summary The aim of this study was to evaluate the quality of the data provided from sheepdog trials in Norway, estimate heritabilities, repeatabilities and genetic correlations for the traits included in the trial and make recommendations on how sheepdog trials best can be utilized in the breeding of Border Collies in Norway. The analyses were based on test results from sheepdog trials carried out in Norway from 1993 to 2012. A total of 45 732 records from 3841 Border Collies were available, but after quality assurance only a third was left. The results demonstrated little information in the data. Heritabilities varied be...
Source: Journal of Animal Breeding and Genetics - August 1, 2016 Category: Genetics & Stem Cells Authors: S. Storteig Horn, G. Steinheim, H. Fjerdingby Olsen, H.F. Gjerjordet, G. Klemetsdal Tags: Original Article Source Type: research

Conservation priorities for the different lines of Dutch Red and White Friesian cattle change when relationships with other breeds are taken into account
This study investigated the genetic diversity in the Dutch Red and White Friesian (DFR) cattle breed and its contribution to the total genetic diversity in the pool of the Dutch dairy breeds. All Dutch cattle breeds are clearly distinct, except for Dutch Friesian breed (DF) and DFR and have their own specific genetic identity. DFR has a small but unique contribution to the total genetic diversity of Dutch cattle breeds and is closely related to the Dutch Friesian breed. Seven different lines are distinguished within the DFR breed and all contribute to the diversity of the DFR breed. Two lines show the largest contributions...
Source: Journal of Animal Breeding and Genetics - July 27, 2016 Category: Genetics & Stem Cells Authors: B. Hulsegge, M.P.L. Calus, J.K. Oldenbroek, J.J. Windig Tags: Original Article Source Type: research

Risk aversion affects economic values of blue fox breeding scheme
Summary The profit and production of an average Finnish blue fox farm was simulated using a deterministic bio‐economic farm model. Risk was included using Arrow‐Prat absolute risk aversion coefficient and profit variance. Risk‐rated economic values were calculated for pregnancy rate, litter loss, litter size, pelt size, pelt quality, pelt colour clarity, feed efficiency and eye infection. With high absolute risk aversion, economic values were lower than with low absolute risk aversion. Economic values were highest for litter loss (18.16 and 26.42 EUR), litter size (13.27 and 19.40 EUR), pregnancy (11.99 and 18.39 EUR...
Source: Journal of Animal Breeding and Genetics - July 19, 2016 Category: Genetics & Stem Cells Authors: J. Peura, R. Kempe, I. Strandén, L. Rydhmer Tags: Original Article Source Type: research

Kalle Maijala 1927 –2016
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - July 14, 2016 Category: Genetics & Stem Cells Authors: Asko M äki‐Tanila Tags: Obituary Source Type: research

Double ‐decker ark of animal breeds
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - July 14, 2016 Category: Genetics & Stem Cells Authors: D. Martin ‐Collado Tags: Book Review Source Type: research

Kalle Maijala 1927–2016
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - July 14, 2016 Category: Genetics & Stem Cells Authors: Asko Mäki‐Tanila Tags: Obituary Source Type: research

Double‐decker ark of animal breeds
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - July 14, 2016 Category: Genetics & Stem Cells Authors: D. Martin‐Collado Tags: Book Review Source Type: research

ICQG 5 on Madison's Isthmus links genomics and statistics of complex traits
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - July 14, 2016 Category: Genetics & Stem Cells Authors: Henner Simianer, Peter Sørensen Tags: Editorial Source Type: research

Use of high ‐density SNP data to identify patterns of diversity and signatures of selection in broiler chickens
Summary The development of broiler chickens over the last 70 years has been accompanied by large phenotypic changes, so that the resulting genomic signatures of selection should be detectable by current statistical techniques with sufficiently dense genetic markers. Using two approaches, this study analysed high‐density SNP data from a broiler chicken line to detect low‐diversity genomic regions characteristic of past selection. Seven regions with zero diversity were identified across the genome. Most of these were very small and did not contain many genes. In addition, fifteen regions were identified with diversity i...
Source: Journal of Animal Breeding and Genetics - June 28, 2016 Category: Genetics & Stem Cells Authors: J.J. Stainton, B. Charlesworth, C.S. Haley, A. Kranis, K. Watson, P. Wiener Tags: Original Article Source Type: research

An evaluation of alternative selection indexes for a non ‐linear profit trait approaching its economic optimum
This study used simulation to evaluate the performance of alternative selection index configurations in the context of a breeding programme where a trait with a non‐linear economic value is approaching an economic optimum. The simulation used a simple population structure that approximately mimics selection in dual purpose sheep flocks in New Zealand (NZ). In the NZ dual purpose sheep population, number of lambs born is a genetic trait that is approaching an economic optimum, while genetically correlated growth traits have linear economic values and are not approaching any optimum. The predominant view among theoretical ...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: D. Martin ‐Collado, T.J. Byrne, B. Visser, P.R. Amer Tags: Original Article Source Type: research

Impact of fitting dominance and additive effects on accuracy of genomic prediction of breeding values in layers
In conclusion, fitting dominance effects did not impact accuracy of genomic prediction of breeding values in this population. (Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: M. Heidaritabar, A. Wolc, J. Arango, J. Zeng, P. Settar, J.E. Fulton, N.P. O'Sullivan, J.W.M. Bastiaansen, R.L. Fernando, D.J. Garrick, J.C.M. Dekkers Tags: Original Article Source Type: research

Use of high‐density SNP data to identify patterns of diversity and signatures of selection in broiler chickens
Summary The development of broiler chickens over the last 70 years has been accompanied by large phenotypic changes, so that the resulting genomic signatures of selection should be detectable by current statistical techniques with sufficiently dense genetic markers. Using two approaches, this study analysed high‐density SNP data from a broiler chicken line to detect low‐diversity genomic regions characteristic of past selection. Seven regions with zero diversity were identified across the genome. Most of these were very small and did not contain many genes. In addition, fifteen regions were identified with diversity i...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: J.J. Stainton, B. Charlesworth, C.S. Haley, A. Kranis, K. Watson, P. Wiener Tags: Original Article Source Type: research

Microsatellite diversity of the Nordic type of goats in relation to breed conservation: how relevant is pure ancestry?
Summary In the last decades, several endangered breeds of livestock species have been re‐established effectively. However, the successful revival of the Dutch and Danish Landrace goats involved crossing with exotic breeds and the ancestry of the current populations is therefore not clear. We have generated genotypes for 27 FAO‐recommended microsatellites of these landraces and three phenotypically similar Nordic‐type landraces and compared these breeds with central European, Mediterranean and south‐west Asian goats. We found decreasing levels of genetic diversity with increasing distance from the south‐west Asian...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: J.A. Lenstra, J. Tigchelaar, I. Biebach, , J.H. Hallsson, J. Kantanen, V.H. Nielsen, F. Pompanon, S. Naderi, H.‐R. Rezaei, N. Sæther, O. Ertugrul, C. Grossen, G. Camenisch, M. Vos‐Loohuis, M. Straten, E.A. Poel, J. Windig, K. Oldenbroek Tags: Original Article Source Type: research

Genome wide association study on beef production traits in Marchigiana cattle breed
Summary A genomewide association study was carried out on a sample of Marchigiana breed cattle to detect markers significantly associated with carcass and meat traits. Four hundred and nine young bulls from 117 commercial herds were genotyped by Illumina 50K BeadChip assay. Eight growth and carcass traits (average daily gain, carcass weight, dressing percentage, body weight, skin weight, shank circumference, head weight and carcass conformation) and two meat quality traits (pH at slaughter and pH 24 h after slaughter) were measured. Data were analysed with a linear mixed model that included fixed effects of herd, slaughte...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: S. Sorbolini, S. Bongiorni, M. Cellesi, G. Gaspa, C. Dimauro, A. Valentini, N.P.P. Macciotta Tags: Original Article Source Type: research

Traditional livestock breeding practices of men and women Somali pastoralists: trait preferences and selection of breeding animals
Summary Somalia, one of the world's poorest countries, has livestock as the mainstay of the economy, with an estimated 65% of the population engaged in the livestock sector. This paper presents a gendered study on the traditional livestock breeding practices of Somali pastoralists for camels, cattle, sheep and goats, with a focus on documenting livestock traits of importance, the criteria used to select male breeding animals and the criteria used to cull female breeding animals. Data for the study were obtained by performing participatory rural appraisals (PRAs) with separate male and female pastoral groups from 20 settlem...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: K. Marshall, N. Mtimet, F. Wanyoike, N. Ndiwa, H. Ghebremariam, L. Mugunieri, R. Costagli Tags: Original Article Source Type: research

Prediction of genetic gain in finite populations with heterogeneous predicted breeding values accuracies
Summary The algebraic expression of the genetic selection differential (expected genetic superiority of breeders after a selection on their Predicted Breeding Values) was derived when a limited number of individuals were selected from a limited sample of candidates on the basis of their predicted genetic value, with heterogeneous reliabilities. A formula is proposed for situations in which these reliabilities can be clustered in a few classes. We show that the expected genetic selection differential increases with the number of classes, the mean reliability being constant. In the panel of cases simulated, this increase rea...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: J.‐M. Elsen Tags: Original Article Source Type: research

An evaluation of alternative selection indexes for a non‐linear profit trait approaching its economic optimum
This study used simulation to evaluate the performance of alternative selection index configurations in the context of a breeding programme where a trait with a non‐linear economic value is approaching an economic optimum. The simulation used a simple population structure that approximately mimics selection in dual purpose sheep flocks in New Zealand (NZ). In the NZ dual purpose sheep population, number of lambs born is a genetic trait that is approaching an economic optimum, while genetically correlated growth traits have linear economic values and are not approaching any optimum. The predominant view among theoretical ...
Source: Journal of Animal Breeding and Genetics - June 1, 2016 Category: Genetics & Stem Cells Authors: D. Martin‐Collado, T.J. Byrne, B. Visser, P.R. Amer Tags: Original Article Source Type: research

Analysis of competition performance in dressage and show jumping of Dutch Warmblood horses
Summary Most Warmblood horse studbooks aim to improve the performance in dressage and show jumping. The Dutch Royal Warmblood Studbook (KWPN) includes the highest score achieved in competition by a horse to evaluate its genetic ability of performance. However, the records collected during competition are associated with some aspects that might affect the quality of the genetic evaluation based on these records. These aspects include the influence of rider, censoring and preselection of the data. The aim of this study was to quantify the impact of rider effect, censoring and preselection on the genetic analysis of competiti...
Source: Journal of Animal Breeding and Genetics - May 30, 2016 Category: Genetics & Stem Cells Authors: G. Rovere, B.J. Ducro, J.A.M. Arendonk, E. Norberg, P. Madsen Tags: Original Article Source Type: research

Inbreeding depression in Zebu cattle traits
Summary The productivity of herds may be negatively affected by inbreeding depression, and it is important to know how intense is this effect on the livestock performance. We performed a comprehensive analysis involving five Zebu breeds reared in Brazil to estimate inbreeding depression in productive and reproductive traits. Inbreeding depression was estimated for 13 traits by including the individual inbreeding rate as a linear covariate in the standard genetic evaluation models. For all breeds and for almost all traits (no effect was observed on gestation length), the performance of the animals was compromised by an incr...
Source: Journal of Animal Breeding and Genetics - May 19, 2016 Category: Genetics & Stem Cells Authors: R.J. Pereira, M.L. Santana, D.R. Ayres, A.B. Bignardi, G.R.O. Menezes, L.O.C. Silva, C.H.C. Machado, L.A. Josahkian, L.G. Albuquerque Tags: Original Article Source Type: research

Genomic data and breeding value estimation in dairy cattle: theory, practice, problems
(Source: Journal of Animal Breeding and Genetics)
Source: Journal of Animal Breeding and Genetics - May 12, 2016 Category: Genetics & Stem Cells Authors: E.A. Mäntysaari, I. Strandén Tags: Editorial Source Type: research

Estimating heritability of wool shedding in a cross ‐bred ewe population
Summary Low wool prices and high production costs in sheep systems have resulted in the introduction of genotypes that shed wool into flocks to reduce shearing costs. Wool shedding occurs naturally in a few breeds and can be incorporated by cross‐breeding. The opportunity to enhance shedding through selection depends on the extent of genetic variability present. Genetic and environmental parameters for wool shedding for ewes from a three‐breed composite population were estimated using Bayesian inference. Data on 2025 cross‐bred ewes, including 3345 wool shedding scores (WS) and 1647 breeding weight (BW) records, were...
Source: Journal of Animal Breeding and Genetics - May 4, 2016 Category: Genetics & Stem Cells Authors: N. Vargas Jurado, K.A. Leymaster, L.A. Kuehn, R.M. Lewis Tags: Original Article Source Type: research

Polymorphism in exon 2 encoding the putative ligand binding pocket of the bovine insulin ‐like growth factor 1 receptor affects milk traits in four different cattle breeds
Summary As a member of the somatotropic axis, insulin‐like growth factor I receptor (IGF1R) seems to be a promising candidate gene. Two silent polymorphisms, identified by MspI and TaqI restriction enzymes, were selected within exon 2, encoding the majority of the putative ligand binding pocket. A total of 1169 cows of four pure breeds (Polish Holstein Friesian, Montbeliarde, Jersey and Holstein Friesian) were genotyped. The T (IGF1R/e2/MspI) and G (IGF1R/e2/TaqI) alleles were found to be prevalent. Three combinations of genotypes (TT/GG, TT/AG and CT/GG) were associated with the highest productivity (milk, protein and f...
Source: Journal of Animal Breeding and Genetics - April 26, 2016 Category: Genetics & Stem Cells Authors: M. Szewczuk Tags: Original Article Source Type: research

Relationship between calving difficulty and fertility traits in first ‐parity Iranian Holsteins under standard and recursive models
Summary The main objective of this study was to estimate the genetic and phenotypic relationships between calving difficulty (CD) and fertility traits, including success at first service (SF), number of inseminations to conception (INS), interval from calving to first service (CTFS), interval between first and last service (IFL) and days open (DO), in first‐parity Iranian Holsteins under standard (SMMs) and recursive (RMMs) mixed models. The data analysed in this paper included 29 950 records on CD and fertility traits, collected in the time period from 1995 to 2014 by the Animal Breeding and Improvement Center of Iran....
Source: Journal of Animal Breeding and Genetics - April 17, 2016 Category: Genetics & Stem Cells Authors: M.S. Mokhtari, M. Moradi Shahrbabak, A. Nejati Javaremi, G.J.M. Rosa Tags: Original Article Source Type: research

Relationship between calving difficulty and fertility traits in first‐parity Iranian Holsteins under standard and recursive models
Summary The main objective of this study was to estimate the genetic and phenotypic relationships between calving difficulty (CD) and fertility traits, including success at first service (SF), number of inseminations to conception (INS), interval from calving to first service (CTFS), interval between first and last service (IFL) and days open (DO), in first‐parity Iranian Holsteins under standard (SMMs) and recursive (RMMs) mixed models. The data analysed in this paper included 29 950 records on CD and fertility traits, collected in the time period from 1995 to 2014 by the Animal Breeding and Improvement Center of Iran....
Source: Journal of Animal Breeding and Genetics - April 17, 2016 Category: Genetics & Stem Cells Authors: M.S. Mokhtari, M. Moradi Shahrbabak, A. Nejati Javaremi, G.J.M. Rosa Tags: Original Article Source Type: research

Estimating heritability of wool shedding in a cross‐bred ewe population
Summary Low wool prices and high production costs in sheep systems have resulted in the introduction of genotypes that shed wool into flocks to reduce shearing costs. Wool shedding occurs naturally in a few breeds and can be incorporated by cross‐breeding. The opportunity to enhance shedding through selection depends on the extent of genetic variability present. Genetic and environmental parameters for wool shedding for ewes from a three‐breed composite population were estimated using Bayesian inference. Data on 2025 cross‐bred ewes, including 3345 wool shedding scores (WS) and 1647 breeding weight (BW) records, were...
Source: Journal of Animal Breeding and Genetics - April 1, 2016 Category: Genetics & Stem Cells Authors: N. Vargas Jurado, K.A. Leymaster, L.A. Kuehn, R.M. Lewis Tags: Original Article Source Type: research

A comparison of methods to estimate genomic relationships using pedigree and markers in livestock populations
Summary Accurate prediction of breeding values depends on capturing the variability in genome sharing of relatives with the same pedigree relationship. Here, we compare two approaches to set up genomic relationship matrices for precision of genomic relationships (GR) and accuracy of estimated breeding values (GEBV). Real and simulated data (pigs, 60k SNP) were analysed, and GR were estimated using two approaches: (i) identity by state, corrected with either the observed (GVR‐O) or the base population (GVR‐B) allele frequencies and (ii) identity by descent using linkage analysis (GIBD‐L). Estimators were evaluated for...
Source: Journal of Animal Breeding and Genetics - April 1, 2016 Category: Genetics & Stem Cells Authors: N.S. Forneris, J.P. Steibel, A. Legarra, Z.G. Vitezica, R.O. Bates, C.W. Ernst, A.L. Basso, R.J.C. Cantet Tags: Original Article Source Type: research

Polymorphism in exon 2 encoding the putative ligand binding pocket of the bovine insulin‐like growth factor 1 receptor affects milk traits in four different cattle breeds
Summary As a member of the somatotropic axis, insulin‐like growth factor I receptor (IGF1R) seems to be a promising candidate gene. Two silent polymorphisms, identified by MspI and TaqI restriction enzymes, were selected within exon 2, encoding the majority of the putative ligand binding pocket. A total of 1169 cows of four pure breeds (Polish Holstein Friesian, Montbeliarde, Jersey and Holstein Friesian) were genotyped. The T (IGF1R/e2/MspI) and G (IGF1R/e2/TaqI) alleles were found to be prevalent. Three combinations of genotypes (TT/GG, TT/AG and CT/GG) were associated with the highest productivity (milk, protein and f...
Source: Journal of Animal Breeding and Genetics - April 1, 2016 Category: Genetics & Stem Cells Authors: M. Szewczuk Tags: Original Article Source Type: research

Accuracy of genomic prediction of purebreds for cross bred performance in pigs
The objective of our study was to assess empirically the predictive ability (accuracy) of direct genomic values of PB for CB performance across two traits using CB and PB genomic and phenotypic data. We studied three scenarios in which genetic merit was predicted within each population, and four scenarios where PB genetic merit for CB performance was predicted based on either CB or a PB training data. Accuracy of prediction of PB genetic merit for CB performance based on CB training data ranged from 0.23 to 0.27 for gestation length (GLE), whereas it ranged from 0.11 to 0.22 for total number of piglets born (TNB). When bas...
Source: Journal of Animal Breeding and Genetics - April 1, 2016 Category: Genetics & Stem Cells Authors: A.M. Hidalgo, J.W.M. Bastiaansen, M.S. Lopes, M.P.L. Calus, D.J. Koning Tags: Original Article Source Type: research