Mild heat stress and short water restriction treatment in lactating Alpine and Saanen goats

Publication date: Available online 8 April 2019Source: Small Ruminant ResearchAuthor(s): Lina S. Jaber, Christine Duvaux-Ponter, Shady K. Hamadeh, Sylvie Giger-ReverdinAbstractHeat and water stress are rampant challenges in animal production as a result of climate change. Sixteen lactating goats of the Alpine and Saanen breeds were subjected to water restriction for 16 hours on two consecutive days followed by rehydration, along with naturally rising temperature that culminated by the end of an experimental period of one week. Data were collected from the animals on four separate days representing their status under control conditions when temperature was still within their comfort zone, on the second day of the water restriction treatment, 24 hours after rehydration and finally on the day when ambient temperature was above the normal average. Animals showed an increase in rectal temperature with time as ambient temperature increased. The heat stress was reflected by the decrease in pCO2 and HCO3 concentrations consistent with the onset of panting, while milk production was maintained but the concentration of major milk components decreased. Water stress, on the other hand, led to hemoconcentration with increased osmolality, Na+, urea, glucose and albumin concentrations and an increase in milk lactose. The changes in blood parameters were reversed 24 hours after rehydration but were slightly lower than normal, indicating the need for more than 24 hours to re-adjust wa...
Source: Small Ruminant Research - Category: Zoology Source Type: research
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