Abstract
ABSTRACT The present study was planned to understand influence of season on reproductive performance in Gir heifers. A cumulative 12 years (2006–2017) full term calving record of Gir heifers (n = 414) were used for analysis. Results indicated that age at sexual maturity (ASM), age at first conception (AFCON), age at first calving (AFC) and number of services per conception (NSC) differed significantly (p < 0.05) across months. Heifers born during summer had significantly (p < 0.05) longer ASM, AFCON and AFC than during winter and rainy seasons. Season did not affect NSC and gestation length (GL). All the reproductive traits gradually and significantly (p < 0.05) reduced from the year 2006 to 2017 except GL. The study revealed that month, season and period of birth had significant (p < 0.05) effect on reproductive performance of Gir heifers, so these factors should be taken care while selecting Gir heifers for reproductive traits improvement.
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