Bivariate analysis of liability to clinical mastitis and to culling in first-lactation cows

被引:17
作者
Heringstad, B
Rekaya, R
Gianola, D
Klemetsdal, G
Weigel, KA
机构
[1] Agr Univ Norway, Dept Anim Sci, N-1432 As, Norway
[2] Univ Georgia, Dept Anim & Dairy Sci, Athens, GA 30602 USA
[3] Univ Wisconsin, Dept Dairy Sci, Madison, WI 53706 USA
关键词
Bayesian methods; clinical mastitis; (co)-variance components; threshold model;
D O I
10.3168/jds.S0022-0302(03)73643-1
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Records taken on 13,070 first-lactation daughters of 250 Norwegian Cattle sires were used to examine associations between susceptibility to clinical mastitis and to culling. Clinical mastitis was defined as a binary trait, whereas culling was treated as either binary (culled or not culled) or continuous (length of opportunity period) for two sampling periods (120 or 300 d of lactation). Two Bayesian models were employed; 1) a bivariate threshold model with both mastitis and culling as binary traits, and 2) a bivariate model with mastitis as a. threshold binary variable and time to culling as Gaussian. The heritability of liability to clinical mastitis was not affected by either the length of sampling period (.120 vs. 300 d) or by whether culling (binary) or length of opportunity period was the second trait in the bivariate analysis. The posterior mean (standard deviation) of heritability of liability to clinical mastitis was 0.06 to 0.07 (0.02) in all analyses. The heritability estimate of length of opportunity period was less than 0.001. Culling (threshold trait) in first lactation had a low heritability, but a high genetic correlation with clinical mastitis. The posterior means (standard deviation) for heritability of liability to culling were 0.01 (0.006) for 120 d and 0.02 (0.009) for 300 d, and the posterior means (standard deviation) of the genetic correlation between liability to clinical mastitis and to culling were 0.48 (0.24) and 0.53 (0.21) for 120 and 300 d, respectively.
引用
收藏
页码:653 / 660
页数:8
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