The effect of temperature, humidity and temperature-humidity and temperature- humidity-sunshine index on milk yield/day of stage of first lactation on Karan Fries and Karan Swiss cows was examined. The correlations between milk yield/day and various climatic variables were, in general, negative and significant. Temperature and humidity when taken together explained the largest variation in milk yield/day of stage of lactation. The differences between breeds for milk yield/day in different stages were significant with overall milk yield/day being 9.60±0.05 and 8.37±0.04 kg in Karan Fries and Karan Swiss cows. Milk yield/day for each stage was plotted against the months to have an idea about the effect of climatic variables. The comfort zone for maximum milk production in crossbreds was between 7°C and 25°C.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 505–509, 1986
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