山西瘦肉型猪新品系(SD-Ⅰ系)6月龄体重遗传趋势分析

用混合模型ＢＬＵＰ法对山西瘦肉型猪新品系（ＳＤ Ⅰ系）选育过程中０～４世代４０头公猪的４４７头后裔６月龄体重进行了遗传趋势评估。结果表明：群体平均育种值随世代的增加而增加,说明ＳＤ Ⅰ系猪选育过程中所采取的育种措施是有效的。各世代间环境条件基本一致,且除０世代外,对表型值都有正的效应。继续进行选育,６月龄体重尚有提高的可能。

Estimation of Genetic Trend for Body Weight of Shanxi Lean-Type Pig Strain at Age of Six Monthes

The body weight records at the age of six monthes of a total 447 Shanxi Lean Type Pigs produced by 40 sires were used to estimate the genetic trend of the strain by BLUP. The results showed that the average breeding value of the population was increased with the increase of the generation. The environment variance was not significent between generations,and it had a positive effect on phenotypic value. All of this indicated that the breeding measures used in the breeding program were effective. It would be obtained genetic progress with continued selection.