Genetic parameters and genetic trends in the Chinese x European Tiameslan composite pig line. II. Genetic trends

文献类型： 外文期刊

第一作者： Zhang, SQ

作者： Zhang, SQ;Bidanel, JP;Burlot, T;Legault, C;Naveau, J

作者机构：

关键词： pigs;genetic trend;performance trait;reproductive trait;Chinese breed

期刊名称：GENETICS SELECTION EVOLUTION （ 影响因子：4.297； 五年影响因子：4.925 ）

ISSN： 0999-193X

年卷期： 2000 年 32 卷 1 期

页码：

收录情况： SCI

摘要： The Tiameslan line was created between 1983 and 1985 by mating Meishan x Jiaxing crossbred Chinese boars with sows from the Laconie composite male line. The Tiameslan line has been selected since then on an index combining average backfat thickness (ABT) and days from 20 to 100 kg (DT). Direct and correlated responses to 11 years of selection were estimated using BLUP methodology applied to a multiple trait animal model. A total of 11 traits were considered, i.e.: ABT, DT, body weight at 4 (W4w), 8 (W8w) and 22 (W22w) weeks of age, tear number (TEAT), number of good teats (GTEAT), total number of piglets born (TNB), born alive (NBA) and weaned (NW) per litter, and birth to weaning survival rate (SURV). Performance data from a total of 4 881 males and 4 799 females from 1 341 litters were analysed. The models included both direct and maternal effects for ABT, W4w and W8w. Male and female performances were considered as different traits for W22w, DT and ABT. Genetic parameters estimated in another paper (Zhang et al., Genet. Sel. Evol. 32 (2000) 41-56) were used to perform the analyses. Favourable phenotypic (Delta P) and direct genetic trends (Delta G(d)) were obtained for post-weaning growth traits and ABT. Trends for maternal effects were limited. Phenotypic and genetic trends were larger in females than in males for ABT (e.g. Delta G(d) = -0.48 vs. - 0.38 mm/year), were larger in males for W22w (Delta G(d) = 0.90 vs. 0.58 kg/year) and were similar in both sexes for DT (Delta G(d) = -0.54 vs. - 0.55 day/year). Phenotypic and genetic treads were slightly favourable for W4w, W8w, TEAT and GTEAT and close to zero for reproductive traits.

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