Italian Journal of Animal Science (Dec 2020)
Effect of hydric stress on intake, growth performance and nutritional status of Nguni goats
Abstract
Limited water intake affects livestock. Though small ruminants are more resilient to suboptimum water intake compared to other species of livestock, tolerance abilities differ among breeds. This study was aimed at investigating the effect of water deprivation levels on intake, growth performance and nutritional status of Nguni goats. Thirty-six Nguni goats (initial weight, 18 ± 3.2 kg) were assigned to one of three treatments: without water deprivation, water deprivation for 24 and 48 h in a completely randomised design for 40 days. Performance traits, body condition score (BCS), faecal egg count (FEC) and FAffa MAlan CHArt (FAMACHA) were determined weekly while blood metabolites were determined on the last day of the experiment and analysed with PROC GLM of SAS software. The average daily water intake (WI) and feed intake (FI) increased (p < .05) with increased period of water deprivation. The average daily gain (ADG) and feed conversion ratio (FCR) declined (p < .01) with increased period of water deprivation. Final body weight, BCS and FAMACHA decreased (p < .05) while faecal egg count, glucose and creatine increased (p < .05) with increased period of water deprivation. Water deprivation period had negative correlations with ADFI, WFR, ADG, FCR, FAMACHA, BCS and BW. The correlation of BW was negative with FEC and positive with serum glucose. It was concluded that water deprivation impacts negatively on the nutritional status, blood metabolites and growth performance of Nguni goats.Highlights Limited water intake in small ruminants decreases body weight and body condition score. Rehydration, after prolonged dehydration of 48 h in small ruminants, results in increased average daily water and feed intake. Under dehydration effect, bodyweight positively correlates with body condition scores and negatively correlates with faecal egg count.
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