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Heritability estimates and effect on lifetime reproductive performance of age at puberty in sows

文献类型： 外文期刊

作者： Li, Qingqing 1 ; Yuan, Xiaolong 1 ; Chen, Zitao 1 ; Zhang, Ailing; Zhang, Zhe 1 ; Zhang, Hao 1 ; Li, Jiaqi 1 ;

作者机构： 1.SCAU, Coll Anim Sci, Natl Engn Res Ctr Breeding Swine Ind, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, 483 Wushan Rd, Guangzhou 510642, Guangdong, Peoples R China

关键词： Age at puberty; Heritability; Sow culling; Reproductive performance

期刊名称：ANIMAL REPRODUCTION SCIENCE （ 影响因子：2.145； 五年影响因子：2.281 ）

ISSN： 0378-4320

年卷期： 2018 年 195 卷

页码：

收录情况： SCI

摘要： Age at puberty closely correlates to the lifetime reproductive performance in sows. This study aimed to estimate the heritability of age at puberty and analyze the effect of age at puberty on lifetime reproductive performance in sows. In total, 1492 Duroc, 2142 Landrace and 3176 Yorkshire gilts with pubertal records were collected from two genetically independent breeding farms in southern China. Heritability estimates of age at puberty were 0.25-0.42. Based on the distribution of age at puberty, gilts in each breed were classified into 1) early puberty (EP); 2) intermediate puberty (IP); and 3) late puberty (LP). Age at first mating/farrowing and parity at culling were significantly influenced by age at puberty (P < 0.05), and the least squares means of all were lowest in EP, intermediate IP, and highest in LP. The trend of pigs weaned/per sow/ year of EP, IP and LP group gilts in Yorkshire population was almost falling; rising first and then falling in Duroc and Landrace populations. Lifetime offspring born alive and lifetime litter birth weight were not significantly influenced by age at puberty (P > 0.05). Reproductive problems were the main reason for culling females. The frequency of culling due to reproductive problems in females was highest in IP, intermediate in LP, and lowest in EP in Duroc and Landrace (P 0.05). Understanding the effect of age at puberty on lifetime reproductive performance could help to improve swine production. Farmers could take measures to detect and keep gilts with the desired age at puberty.

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