Analysis of 5522 lactations by Wood's incomplete gamma function indicated important effects of lactation number and season of calving, with lower peak yield and higher persistency in first lactations and cows calving in the Summer. Curve parameters had heritability estimates ranging between .11 and .16, and their genetic correlation with total milk yield was low to intermediate. Peak yield and persistency at 270 days of lactation had heritability estimates of .28 and .17, respectively, and their genetic correlation with total milk yield was high.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 132–135, 1994
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