西门塔尔牛14项线性体型评分的正态分布检验

TEST ON NORMAL DlSTRIBUTION FOR 14 LINEAR TYPETRAIT EVALUATION OF SIMMENTAL COWS

１４项线性体型性状引人到包括蒙贝利亚和弗列克维两个类群７０头成年母牛的西门塔尔牛群。体高、强壮度、乳用性、尻角、前乳房附着、后乳房宽度、乳头位置和乳房静脉８个性状附合正态分布。而后腿侧观、尻宽、后乳房高度、乳房支撑和乳房匀度的评分具有偏崎（Ｐ＜０．０５），乳房深度偏崎十分明显（Ｐ＜０．０１）。１３项评分性状是呈陡峰现象，只有乳房静脉一项不是（Ｐ＜０．０５）；呈现陡峰现象的原因可能是分值取自于数个评分员的平均值所致。

Fourteen linear type traits were introduced for Simmental cattle in China, includingMontbeliard and Flechvieh in total of 70 adult cows. The evaluated scores of stature,strength, dairyness, rump angle, fore udder attachment, rare udder width, teat Place-ment and udder vein were demonstrated as fit as to normal distribution. The scores ofrear leg side view, rump width, rear udder height, suspensory support and udderbalance were of skewed distribution (P<0.05). The distribution of udder depth wassignificantly skewed (P<0.01). It was suggested that skewness for sertain traits may becaused by two different breed groups. The kurtosis of most of the traits were veryobvious (p<0.01), except udder vein (P<0.05). Causes for the big kurtosis of thesetraits were supposed to be from the calculated means of several evaluators' which madethe distribution centerized rating.