Abstract
The present research was carried out to determine the effect of non-genetic factors on first lactation 305 days and lifetime milk yield of Sahiwal cattle. Data were collected on 392 cows maintained at NDRI, Karnal herd for first lactation 305 days milk yield and on 282 cows for lifetime production, over a period of 31 years (1986-2017).The overall least squares mean for first lactation 305 days milk yield and lifetime milk yield were found to be 1898.95 ± 50.26 (Kg) and 7241.47 ± 411.18 (Kg) respectively. Season of calving, period of calving and age at first calving were taken as the non-genetic factors affecting the traits of interest. The effect of season of calving and age at first calving was found to be non- significant on first lactation 305 days milk yield whereas the effect of period of calving was significantly affecting first lactation 305 days milk yield. The effect of season of calving was non-significant on lifetime milk yield also. Age at first calving and period of calving had a highly significant effect on life time milk yield of Sahiwal cattle.
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