宁夏地区荷斯坦奶牛头胎产奶量的通径分析与多元线性回归分析

发布时间：2018-04-20 07:54

本文选题：头胎产奶量 + 通径分析　；参考：《畜牧与兽医》2017年02期

【摘要】：为了从奶牛的初期性状中找到影响头胎305 d产奶量的主要因素,保证早期选种的准确性,加速奶牛育种工作,预测奶牛305 d产奶量,对宁夏地区2004—2013年9年之间出生的10 527头中国荷斯坦奶牛的94 743条测定日记录进行分析,并对头胎初产日龄(x_1),日产奶(x_2),乳脂率(x_3),蛋白率(x_4),体细胞评分(x_5),乳糖率(x_6),高峰奶(x_7),高峰日(x_8)和头胎305 d产奶量(y)进行通径分析。通过逐步回归的方法将x6剔除出回归方程。结果显示:宁夏地区奶牛305 d产奶量的回归方程为,y=-1 392.56+0.17x_1+87.87x_2-75.09x_3+245.14x_4-35.95x_5+175.10x_7+5.99x_8;各自变量对回归方程估测可靠度R~2总贡献分析,x_7对R~2的总贡献率为0.52,居各自变量之首。回归方程的建立为准确预测奶牛营养需要、实施奶牛的精细化饲养提供了依据。
[Abstract]:In order to find out the main factors influencing the milk yield of the first baby 305 days from the initial traits of the cow, to ensure the accuracy of early selection, to speed up the breeding work of the cow, and to predict the milk yield of the cow at 305 days. The 94,743 daily records of 10,527 Chinese Holstein cows born between 2004 and 2013 in Ningxia were analyzed. The path analysis was also carried out on the first day of birth of the first born child, such as: 1 / 1, 1 / 1, 1 / 2 / d / d, 1 / 2 / 2 / 1, 1 / 2 / 1 / 1, 1 / 2 / 2 / 1 / 1, 1 / 2 / 2 / 1, 1 / 4 / 1, 1 / 4 / 1, 5 / 5 / 5, 5 / 5, 6 / 6, 7 / 7 / 7, and 305 days / 305d / d milk yield, respectively, and the milk yield of the first fetus (305 days) was analyzed by means of path analysis. X 6 is eliminated from the regression equation by stepwise regression method. The results showed that the regression equation of milk yield of dairy cows in Ningxia was 392.56 0.17x_1 87.87x_2-75.09x_3 245.14x_4-35.95x_5 175.10x_7 5.99x8, and the total contribution rate of RG-2 to RG-2 was 0.52, ranking first among their variables. The establishment of regression equation provides a basis for accurately predicting the nutritional needs of dairy cows and carrying out fine feeding.
【作者单位】：宁夏大学农学院;宁夏畜牧工作站;
【基金】：“优质高产奶牛选育”项目(2013NYYZ0501)
【分类号】：S823

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