Data comprised 3,282 first lactation milk yield records from cows calved trough 1996 to 2004. 305 d milk yield, lactation length, age at first calving and calving interval averages were 3,348.711,591.01 kg, 272.182.5 days, 1,018.8169.5 days and 420.4984.3 days, respectively. Breed additive genetic effect influenced all traits, except calving interval and the differences between Holstein and Gir breeds was 1,173 kg, 35 days and 94 days, respectively, for milk yield, lactation length and age at first calving. Additive maternal effect was not important. Individual heterosis affected milk yield and age at first calving, with differences between F1 progenies and pure bred parents of 277.48 kg and 75.69 days, respectively.

A. Freitas, M. Freitas, N. Teixeira, C. Costa

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.57, 2006
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