Article
Correlated selection responses for female fertility after selection for high protein yield or low mastitis frequency in Norwegian Red cows.
Journal of dairy science - 1 Dec 2010
Heringstad B, Larsgard A G
Abstract excerpt
Correlated selection responses in female fertility were estimated from a selection experiment with 2 groups of Norwegian Red cows selected for high protein yield (HPY) and low mastitis frequency (LCM), respectively. Genetic trends were calculated for nonreturn rate within 56 d after first insemination (NR56) for heifers, first-lactation cows, and second- and third-lactation cows, calving interval between first...
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