新疆塔城地区草原放牧公犊生产性能的研究

选取12月龄的新疆褐牛公犊10头和美新褐F1公犊9头（美国褐牛×新疆褐牛杂种F1）在新疆塔城天然草原放牧150d，研究在天然草原放牧条件下新疆褐牛及美新褐F，公犊的生产性能。结果表明：美新褐F1体重比新疆褐牛提高了13．01％（P〈0．05），体高比新疆褐牛提高了5．36％（P〈0．01）：宰前活重、胴体重分别比新疆褐牛提高了13．01％、15．17％（P〈0．05），相关性分析得出新疆褐牛各体尺、胴体重之间均存在显著或极显著相关，而美新褐F。只有胸围、体重、胴体重之间存在显著或极显著相关。美新褐F1生长发育好于新疆褐牛，使其总体品质有所提高，达到了选育提高的目的。

Studies on Production Performance of Grazing in Grassland's Bull Calves in Tacheng Area

To study of the production performance of Xinjiang Brown and American-Xinjiang Brown F1 Bull Calves, We choosed 10 heads of twelve-month-old Xinjiang Brown Bull Calves, and 9 heads of American- Xinjiang Brown F1 Bull Calves （AmericanxXinjiang Brown F1 hybrid Calves）,Which were grazed on natural grasslands for 150 days.The results showed that the weight gain of American xXinjiang Brown F1 hybrid Calves was 13.01% than Xinjiang Brown groups（P〈0.05）,and the withers height was 5.36% than it（P〈0.01）. And liveweight before slaughtering, carcass weight were improved 13.01%, 15.17% （P 〈0.05 ） respectively.The Correlation analys indicated that both body measurement and carcass weight have significant or very significant correlation among Xinjiang Brown,While there only has significant or very significant correlation in chest circumference, liveweight and carcass weight among American xXinjiang Brown F~ hybrid Calves. The results concluded that growth and development of AmericanxXinjiang Brown F1 hybrid Calves is better than Xinjiang Brown,which made the general quantity was high improved,and achieved the goal of selection improvement.