Estimation of genetic parameters for litter size in sheep: a comparison of a repeatability and a multivariate model

被引：13

作者：

de Vries, MJ ^{[1
]}

van der Waaij, EH ^{[1
]}

van Arendonk, JAM ^{[1
]}

机构：

[1] Wageningen Univ Agr, Wageningen Inst Anim Sci, Anim Breeding & Genet Grp, NL-6700 AH Wageningen, Netherlands

来源：

ANIMAL SCIENCE | 1998年 / 66卷

关键词：

genetic parameters; litter size; multiple trait; repeatability model; sheep;

D O I：

10.1017/S1357729800009255

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Genetic parameters were estimated for litter size in two prolific sheep breeds, i.e. the Zwartbles and the synthetic breed Swifter. Genetic parameters and breeding values for litter size in different parities were estimated using both a repeatability and a multivariate animal model. The estimated heritability from the repeatability model was 0.10 for the Zwartbles and 0.12 for the Swifter. For the multivariate model, heritability of litter size in first, second and third parity was 0.05, 0.07 and 0.10 for the Zwartbles and 0.09, 0.12 and 0.09 for the Swifter. Genetic correlation for litter size in Swifter was 0.81 between parity 1 and 2 and 0.99 between parity 2 and 3. For the Zwartbles genetic correlations were all very close to unity. Environmental correlations between litter size in subsequent parities were not constant over parities. Phenotypic variance in litter size in both breeds was 0.309 in first parity and was almost 50% higher in later parities. Based on the results it is recommended to apply a multiple trait model.

引用

页码：685 / 688

页数：4

共 9 条

[1]

BEKEDAM M, 1994, SHEEP BREEDING SHEEP

[2]

Bradford G. E., 1985, Genetics of reproduction in sheep., P3

[3]

DEGRAAF F, 1985, B256 IVO

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