19-Title: First lactation performance of Sahiwal in the region of northern India
Authors: Sumit Kumar, R Goel, Deepak Sharma and Madhu Tiwari
Source: Ruminant Science (2013)-2(1):77-79.
How to cite this manuscript: Kumar Sumit, Goel R, Sharma Deepak and Tiwari Madhu (2013). First lactation performance of Sahiwal in the region of northern India. Ruminant Science 2(1):77-79.
The present investigation was carried out for genetic study of production traits viz. first lactation 300 days milk yield (MY-300), 90 days milk yield (MY-90), 120 days milk yield (MY-120), 150 days milk yield (MY-150), 180 days milk yield (MY-180), first lactation peak yield (FPY), and days to reach peak yield (DTRP). The least squares means for MY-90, MY-120, MY-150, MY-180, FPY, DTRP and MY-300 were estimated as 631.225±5.025 kg, 827.728±5.506 kg, 1043.876±6.975 kg, 1250.066±7.310 kg, 8.519±0.020 kg, 52.66±0.057 days and 1707.642±4.874 kg, respectively. The highest average for 90, 150 and 180 days milk yield was recorded in P8 (2004 to 2006) and for 120 days milk yield in P7 (2001 to 2003) while the lowest milk yield for 90, 120 and 180 days was observed in P2 (1986 to 1988) and for 150 days milk yield in P4 (1992 to 1994). The heritability estimates for 90, 120, 150, 180 days part milk yield, peak yield, days to reach peak yield and 300 days milk yield were 0.129±0.042, 0.145±0.045, 0.237±0.063, 0.303±0.075, 0.384±0.089, 0.365±0.086 and 0.322±0.078, respectively.
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