Relation of genetic variants of milk protein with milk yield in beef cattle and the results of rearing their calves. Pt. 1. Hereford
2003
Krol, J. (Akademia Rolnicza, Lublin (Poland). Zaklad Oceny i Wykorzystania Surowcow Zwierzecych)
The studies were conducted on the group 48 Hereford as well as their calves from three succeeding parities. These cows were used only as mothers reared their calves through the period of about 6-7 months. For all the cows, the polymorphism of alpha S1-, beta- and kappa-casein and beta-lactoglobulin were determined. The results of rearing were evaluated based on body weight after birth and on weaning at 210 days of life as well as the daily body weight gains during the rearing period. A positive relationship of genetic variants AB of beta-lactoglobulin, beta-casein, kappa-casein and BB of alpha S1-casein were found with the milk yield of cows and calves rearing performance. Cows with the above genotypes produced significantly more milk, and the daily gains of the calves body were increased and so was their body weight at 210 days of life
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