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Factors affecting milk production in Sahiwal cows


Factors affecting milk production in Sahiwal cows



Indian J Veterinary Sci Anim Husb 34(3): 158-165



Records of 160 cows of Sahiwal breed were studied to determine the influence oi various characters on milk production. The results of this investigation indicate that the average age at 1st calving in these herds is 38.45 [plus or minus] 0.39 months and it is highly correlated genetically with 1st lactation yield to the extent of r=0.8126. This strongly suggests that simultaneous selection for both the traits is most essential. The average peak yield and lactation period were 18.3 [plus or minus] 0.37 lb. and 295.8 [plus or minus] 4.7 days respectively. The genetic correlations of these traits with milk yield were 0.6072 and 0.6382 in the same order. Peak yield can be taken as preliminary measure of selection for milk yield. The average dry period was 121.2 [plus or minus] 3.8 days. Maximum yield followed an optimum dry period of 90 to 105 days. Either shorter or longer period than this showed a declining trend in yield.

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