Pantnagar Journal of Research

Abstract

The present study was conducted on 308 Sahiwal cows sired by 38 bulls spared over a period of 32 years (1981- 2012), maintained at the Instructional Dairy Farm and AICRP on cattle -Sahiwal (field unit) at G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, and ChakGanjaria Government Cattle Farm Lucknow, Uttar Pradesh. The overall least- square means for first lactation milk yield (FLMY), first lactation length (FLL), first peak yield (FPY), days attain to first peak yield (DAFPY), age at first calving (AFC), first calving interval (FC1) and first service period (FSP) were as 1927.50±36.68 kg, 290.42±5.57 days, 11.15±0.39 kg and 41.78±2.97 days, 1281.89±15.57 days, 426.70±8.53 days and 140.85±8.90 days, respectively. The season was found to influence the first lactation milk yield at 5% level of significance. The period of calving significantly (P < 0.05) influenced first peak yield and age at first calving while it was non-significantly influencing FLL, FLMY, DAFPY, FC1 and FSP.