奶牛产奶量校正系数研究

以西安市草滩农场第四奶牛场1994~2005年178头中国黑白花奶牛不同胎次、不同产奶月龄、不同泌乳天数和不同产犊月份的产奶量测定结果为材料,采用回归分析方法,分别建立了产奶量对胎次、年龄、泌乳天数、产犊月份等因素的最优回归方程,对其显著性进行了检验,根据这4个最优回归方程分别以第三胎、41月龄、305d、1月份估计产奶量为标准,计算了产奶量的校正系数,制定出该场的产奶量校正系数表,并对由奶牛产奶量不同影响因素构建的产奶量校正系数表进行了产奶量校正的实际应用计算。结果表明,所建立的回归方程拟合度高,所得的4类校正系数表准确、可靠,对该奶牛场育种工作的开展及生产计划的制定具有重要的实际应用价值。

Study on adjusting coefficient for milk yield of dairy cattle

This study is based on the milk yield records of 178 Chinese dairy cattle from the Fourth Dairy Cattle Farm of Caotan Farm from 1994 to 2005 in Xi'an.The adjusting coefficients of milk yield with calving numbers,years,milking days,calving months were investigated with the simple statistical polynomial regression analysis method.Four best regression equations were established and their significances were measured by difference significance test.Four tables of coefficients for adjusting milk yield of Chinese dairy cattle in this farm were presented.Practices using adjusting coefficients of milk yield were calculated for parity number,years,milking days,and calving months as the examples.Results indicate the 4 categories' adjusting coefficicents are correct and reliable.And they're of practical value in the breeding of dairy farm and the formulation of the production plans.