Field-Based Estimation of Non-Genetic Influences on Pre- and Post-Weaning Average Daily Weight Gain in Sangamneri Goats

Abstract

The present study evaluated the effects of major non-genetic factors on pre- and post-weaning average daily weight gain in Sangamneri goats maintained under field conditions in Maharashtra, India. Records from 14,505 kids maintained under the All India Coordinated Research Project (AICRP) on Goat Improvement at Mahatma Phule Krishi Vidyapeeth, Rahuri, were analysed. The traits considered were pre-weaning average daily weight gain (PADWG) and post-weaning average daily weight gain (POADWG). The fixed effects included period of kidding (2005–2010, 2011–2015 and 2016–2020), season of kidding (rainy, winter and summer), sex of kid, type of birth and cluster. Data were analysed using least-squares analysis of variance, and significant differences among subclass means were compared using Duncan’s Multiple Range Test. The overall least-squares mean for PADWG was 0.128 ± 0.001 kg/day, while POADWG was 0.066 ± 0.001 kg/day. All non-genetic factors had a highly significant effect (P<0.01) on PADWG. POADWG was significantly affected by period of kidding, sex of kid, type of birth and cluster, whereas the effect of season of kidding was non-significant (P>0.05). Kids born during 2016–2020 showed the highest PADWG (0.167 ± 0.001 kg/day), while those born during 2011–2015 had the highest POADWG (0.071 ± 0.001 kg/day). Male kids, singleton births and kids in the Rahuri cluster showed higher pre-weaning gains, whereas twins and triplets and kids in the Belha cluster showed higher post-weaning gains. The findings indicate that adjustment for identified non-genetic factors is important when evaluating growth records and planning selection or management strategies for Sangamneri goats under field conditions within the studied production system.