David Ingrid, Druart Xavier, Lagriffoul Gilles, Manfredi Eduardo, Robert-Granié Christèle, Bodin Loys
Station d'amélioration génétique des animaux, INRA, UR631, BP 52627, 31320 Castanet-Tolosan Cedex, France.
Genet Sel Evol. 2007 Jul-Aug;39(4):405-19. doi: 10.1186/1297-9686-39-4-405. Epub 2007 Jul 6.
Data from 51,107 and 11,839 ejaculates collected on rams of the "Lacaune" and "Manech tête rousse" breeds, respectively, were analysed to determine environmental and genetic factors affecting semen production traits (ejaculate volume, semen concentration, number of spermatozoa and motility) in young (< or = 1 year) and adult (> or = 2 years) rams. Fixed effects and variance components were estimated using multiple trait animal models within each breed. For all traits, the main environmental effects identified were year, season, number of ejaculations, daily variation, interval from previous to current collection and age. Heritability estimates were moderate for volume, concentration and number of spermatozoa (0.12 to 0.33) and lower for motility (0.02 to 0.14). Genetic correlations between ages differed from 1 for all traits (0.14 to 0.90), indicating that semen characteristics corresponded to different traits in young and adult rams. Genetic and phenotypic correlations among traits within age category were globally similar for the different breeds and categories of animals.
分别对从“拉库纳”和“马内克红脑袋”品种的公羊采集的51,107份和11,839份射精样本数据进行了分析，以确定影响幼年（≤1岁）和成年（≥2岁）公羊精液生产性状（射精量、精液浓度、精子数量和活力）的环境和遗传因素。使用每个品种内的多性状动物模型估计固定效应和方差分量。对于所有性状，确定的主要环境效应为年份、季节、射精次数、日变化、上次采集到本次采集的间隔时间和年龄。射精量、浓度和精子数量的遗传力估计值适中（0.12至0.33），活力的遗传力估计值较低（0.02至0.14）。所有性状在不同年龄之间的遗传相关性均不等于1（0.14至0.90），这表明幼年和成年公羊的精液特征对应于不同的性状。不同品种和动物类别在年龄类别内各性状之间的遗传和表型相关性总体相似。
