Performance of an Escherichia coli phytase expressed in Lactococcus lactis on nutrient retention, bone traits and intestinal morphology in broiler chickens

In this study, the efficacy of a recombinant probiotic,Lactococcus lactis (L.  lactis), with a potential of phytase production was evaluated in broiler chickens. To this aim, 360 one ‐day‐old male broiler Cobb 500 were divided into six treatments with six replicates and reared to 42 days of age. The experimental treatments included positive control diet containing adequate phosphorus (PC), negative control diet containing reduced available phosphorus (NC), negative control diet involving recombinantL.  lactis (RLL), negative control diet containing both recombinantL.  lactis andLactobacillus salivarius (RLL  + LBS), negative control diet including non‐recombinantL.  lactis (LL) and negative control diet containing Hostazym®. Growth performance, total tract apparent disappearance of phytate ‐P and nutrient retention, mineral content of the tibia and histomorphology of jejunum were evaluated at the age of 35 days. Based on the results, the phosphorus (P) deficiency in the diet reduced body weight (BW), average daily gain (ADG), length and strength of tibia and increased feed conversi on ratio (FCR) compared to PC group. However, the supplementation of Hostazym® or RLL probiotic into the feed improved BW, ADG, FCR, disappearance of Phytate ‐P and retention of P, length and strength of the tibia in a level similar to PC treatment. Phosphorus content of tibia in the chickens fed P‐deficient diets containing RLL was similar to that of the tibia in the control ...
Source: Journal of Animal Physiology and Animal Nutrition - Category: Zoology Authors: Tags: ORIGINAL ARTICLE Source Type: research