环境因素影响牦母牛最高月产奶量的研究

牦母牛的最高月产奶量是具有重要育种价值和生产意义的数量性状,研究影响最高月产奶量的环境因素,可以通过提高月产奶量来实现提高牦母牛产奶性能的目的.孕前期体重和管理因素对最高月产奶量的影响极显著(p＜0.01),孕后期简单补饲的影响显著p＜0.05).孕前期体重因素中最差水平组可减少最高月产奶量达 18.3kg(49.75%,p＜0.01),管理因素中最好水平组比最差水平组增加最高月产奶量达14.9kg(5.92%,p＜0.01),孕后期简单补饲组比对照组增加最高月产奶量达5.6kg(11.9,p＜0.05).

Researching on Functions of Environmental Facters to the Tallest MonthMilk Yield of Yak Cow

The tallest month milk yield of the yak cow is a qua ntity character that have the important value to the yak breeding and productin g.It is possible that the milkability has been increesed by the tallest month m ilk yield about which the environment facters have been researched.The effect s are the most obvious that the facters of the weight in prophase of the pregna ncy of the yak cow and the management levels act on the tallest month milk yiel d(p<0.01).The fuction is very obvious also that the facter of supplement ation of hay in anaphase of pregnancy of the yak cow act on that(p<0.05) .Among levels of facter of prophase of the pregnancy the most bad level can red uce that to amount to18.3kg (49.75%,p<0.01).Among levels of management facter the best level has increased that to amount to14.9kg com paring with the most bad level (35.92%,p<0.01).The group of suppl ementation of hay in anaphase of pregnancy has increased that to amount to5. 6kg(11.9%,p<0.05)comparing with the comparison group.