ESTIMATION OF REPEATABILITY OF CALVING EASE IN CANADIAN HOLSTEINS

被引：13

作者：

KLASSEN, DJ ^{[1
]}

CUE, RI ^{[1
]}

HAYES, JF ^{[1
]}

机构：

[1] MCGILL UNIV,MACDONALD COLL,DEPT ANIM SCI,ST ANNE BELLEVUE H0A 1C0,QUEBEC,CANADA

来源：

JOURNAL OF DAIRY SCIENCE | 1990年 / 73卷 / 01期

关键词：

calving ease; Canadian Holsteins; repeatability;

D O I：

10.3168/jds.S0022-0302(90)78665-1

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Restricted maximum likelihood was used to estimate repeatabilities and heritabilities for calving ease from a data set of 636,972 Holstein parturitions obtained from the Quebec Dairy Herd Analysis Service. Subsets of the data, chosen to reflect different stages of cow maturity, were analyzed separately and compared. Initial least squares analyses were used to define the fixed effects to include in the model. The effects of herd-year-season, sex of calf, parity, and sex by parity interaction were significant in all subsets. Age and parity by age interaction were significant in subsets with primarily younger animals. Variances for sire of calf, cow, and residual effects were then estimated by REML. Repeatabilities ranged from 5.98 to 7.87% and heritabilities for calving ease as a direct effect ranged from 1.97 to 4.70%. © 1990, American Dairy Science Association. All rights reserved.

引用

页码：205 / 212

页数：8

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