[目的]从繁殖和生产性能上探讨各因素对新疆地区荷斯坦奶牛难产度的影响.[方法]采用SAS8.1软件对影响难产度的因素进行最小二乘方差分析.[结果]:不同胎次对难产度有显著的影响(P0.05);产犊间隔对难产度有极显著的影响(P0.05).[结论]通过大量的记录资料对荷斯坦奶牛难产度因素进行分析,这将有利于牛场有效地预防难产,降低难产的发生率.%[Objective]ln order to investigate factors of calving traits and production performance influencing dystocia degrees of Hostein in Xinjiang, [ Method ] The effects on dystocia degrees were analyzed by SAS8.1 CLM . [ Result]The results showed that : effect of different parity on dystocia degrees was significant ( P ＜ 0.05) ; effect of different calving season on dystocia degrees was significant ( P ＜ 0.05) ; effect of different days of pregnancy on dystocia degrees was not significant ( P ＞ 0.05) ; effect of different calving interval on dystocia degrees was highly significant ( P ＜ 0.01) ; effect of calf sex on dystocia degrees was significant ( P ＜ 0.05); effect of birth weight on dystocia degrees was highly significant ( P ＜ 0.01); effect of different calving type on dystocia degrees was highly significant ( P ＜ 0.01) ; effect of 305 - day milk yield on dystocia degrees was not significant ( P ＞ 0.05) [Conclusion] In this paper, the dystocia factors of Holstein were analyzed by a large number of record materials which will effectively help to prevent dystocia and reduce the occurrence rate of dystocia.
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