Zhang S, Bidanel J P, Burlot T, Legault C, Naveau J
Station de génétique quantitative et appliquée, Institut national de la recherche agronomique, 78352 Jouy-en-Josas Cedex, France.
Genet Sel Evol. 2000 Jan-Feb;32(1):57-71. doi: 10.1186/1297-9686-32-1-57.
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, teat 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 (DeltaP) and direct genetic trends (DeltaG(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. DeltaG(d) = - 0.48 vs. -0.38 mm/year), were larger in males for W22w (DeltaG(d) = 0.90 vs. 0.58 kg/year) and were similar in both sexes for DT (DeltaG(d) = - 0.54 vs. - 0.55 day/year). Phenotypic and genetic trends were slightly favourable for W4w, W8w, TEAT and GTEAT and close to zero for reproductive traits.
蒂亚梅斯兰品系于1983年至1985年间育成，方法是将梅山猪与嘉兴杂交的中国公猪与拉科尼复合雄性品系的母猪进行交配。从那时起，蒂亚梅斯兰品系就根据一个综合平均背膘厚度（ABT）和20至100千克体重所需天数（DT）的指数进行选育。利用应用于多性状动物模型的BLUP方法估计了11年选育的直接和相关反应。总共考虑了11个性状，即：ABT、DT、4周龄（W4w）、8周龄（W8w）和22周龄（W22w）时的体重、乳头数（TEAT）、有效乳头数（GTEAT）、每窝出生仔猪总数（TNB）、出生时存活仔猪数（NBA）和断奶仔猪数（NW），以及出生至断奶的存活率（SURV）。分析了来自1341窝的总共4881头雄性和4799头雌性的性能数据。模型包括ABT、W4w和W8w的直接和母体效应。对于W22w、DT和ABT，雄性和雌性的性能被视为不同的性状。使用另一篇论文（Zhang等人，《遗传选择进化》32（2000）41 - 56）中估计的遗传参数进行分析。断奶后生长性状和ABT获得了有利的表型（DeltaP）和直接遗传趋势（DeltaG(d)）。母体效应的趋势有限。ABT的表型和遗传趋势在雌性中比在雄性中更大（例如，DeltaG(d) = - 0.48对 - 0.38毫米/年），W22w在雄性中更大（DeltaG(d) = 0.90对0.58千克/年），DT在两性中相似（DeltaG(d) = - 0.54对 - 0.55天/年）。W4w、W8w、TEAT和GTEAT的表型和遗传趋势略有有利，繁殖性状接近零。
