A review of research on genetic variation in physiological characteristics related to performance in dairy cattle.

摘要: Genetic influence on physiological characteristics ranges from single gene effects amino acid substitutions in alternative forms of proteins to quantitative genetic the amounts enzymes and hormones. The number loci involved control variation physiologically important substances is not known. A marker genes that affect blood antigens, serum milk proteins, have been identified dairy cattle. However, relatively little known about traits Much more hormones laboratory animals. About 25% production cows results differences. We need studies influences various biochemical processes secretion reveal mechanisms by which genetics quantity quality produced individual cows.