Relation of genetic variants of milk protein with milk yield in beef cattle and the results of rearing their calves. Pt. 2. Limousine
2003
Krol, J. (Akademia Rolnicza, Lublin (Poland). Zaklad Oceny i Wykorzystania Surowcow Zwierzecych)
The studies was conducted in East-Central Poland. The research material included 42 Limousine cows as well as their calves from next three parities (I - 42, II - 33 and III - 33). Through the whole period of rearing calves were kept at mothers (6-7 months). Mother's milk constituted the basic feed for the calves and added with later added with pastures grass. 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 gain during the rearing period. The effect of genetic variants of estimated fractions of milk protein as well as the next parities were found on milk yield of Limousine cows. Cows with genotypes AB of beta-Lg, beta-Cn and kappa-Cn as well as BB of alpha S1-Cn produced significantly more milk and the milk yield increased with every parity. Essential dependence was also found between milk protein genotypes and rearing performance of calves. The milk of cows with the following genotypes: AB beta-Lg, BB alpha S1-Cn, AB beta-Cn and AB kappa-Cn appeared to be most valuable as its nutritious effect influenced the high daily gains of calves
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