Abstract
The data on growth and fertility traits of 43 Sahiwal bulls during 27 years (1987-2013) belonging to 8 sets of Sahiwal Breeding Project at ICAR-National Dairy Research Institute, Karnal (Haryana), India were analysed using fixed linear model to assess the effect of non-genetic factors on birth weight and fertility traits in Sahiwal bulls. The average birth weight (BW), conception rate based on first AI (CRFAI) and overall conception rate (OCR) in Sahiwal bulls was estimated as 22.19 ± 0.05 kg, 45.95 ± 1.37% and 46.38 ± 1.55%, with coefficient of variation of 13.42%, 21.84 % and 22.32%, respectively. The overall least-squares means for birth weight, conception rate based on first AI and overall conception rate was estimated as 22.04 ± 1.08 kg, 46.24 ± 0.35% and 46.86 ± 0.27%, respectively in Sahiwal breeding bulls. Period of birth had not influenced the birth weight of Sahiwal bulls, though period of conception had significant (P < 0.01) effect on fertility traits. Season of birth/AI, parity and age of female did not influenced the birth weight and fertility traits of Sahiwal bulls.
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