Jaswant Singh and CV Singh*
The data for the present study was collected on first lactation milk and life time performance traits of 1367 Sahiwal cows born to 112 sires spread over a period of 71 years from 1944-2014 maintained at Government Livestock Farm, Chakganjaria, Lucknow. The overall least squares mean of first lactation traits viz. first lactation milk yield, life time lactation length, life time milk yield and average daily milk yield were estimated to be 1941.16 ± 27.66 kg, 1534.28 ± 36.84 days, 9262.50 ± 272.92 kg and 5.94 ± 0.10 kg respectively. Season effect was non-significant on all the traits. The periods of calving were found to have significant influence on first lactation milk yield and average daily milk yield, the sire effect was found significant on all the traits. The heritability estimates of different first lactation and life time traits were observed low to medium. The genetic and phenotypic correlations among all the traits were observed very low to high.
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