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Effect of age, body weight at calving and lactation length on milk production in Hariana cattle



Effect of age, body weight at calving and lactation length on milk production in Hariana cattle



Indian Journal of Dairy Science 38(4): 295-301



Records from 3705 lactations of 1102 cows on 3 farms in 1951-1975 were analysed. Milk yield increased with lactation number up to 3rd lactation and with calving age up to 86-95 months, and then decreased. However, linear, quadratic and cubic effects of lactation number and calving age resp. only accounted for 2.6 and 3.25% of the variation in milk yield. Lactation length explained 44.5% of the variation in lactation milk yield, with a regression of 3.95 +or- 0.07 kg/day of lactation.

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