Genetic correlations of days open with milk, fat and protein yields, and fat and
 protein contents were estimated from 31641 first lactation records of daughters of 488 young and 75 proven sires from Quebec DHAS data using multivariate REML fitted to a sire model accounting for relationships among sires. The heritability of days open was 0.014 ± 0.009, and
 genetic correlations with milk, fat and protein yields, and fat and protein percentages were 0.544 ±0.219, 0.512 ±0.220, 0.630 ±0.223, -0.006 ±0.203 and -0.055 ± 0.205, respectively. Because of very small genetic variance of days open, its high and positive antagonistic genetic correlations with yield traits may be of limited consequence in genetic evaluation of dairy cattle. It was suggested that the milk production traits may be adjusted for days open for evaluation of sires.

V. PS Chauhan, J. F Hayes, T. Brown

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 109–112, 1994
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