| 摘要: |
| 在考虑后裔测验与配母羊比例及测验公羊数量的条件下,按群体规模进行了中国美利奴羊育种方案最优化的模型计算,探索规划模型计算结果在我国细毛羊育种实践中应用和推广的可能性。结果表明:随着群体规模的扩大,多性状综合选育的育种进展及育种效益均较大幅度地提高;根据中国美利奴羊群的现状,后裔测验与配母羊在核心群中的比例应相应提高,最好达到50%以上;在一个2～4万只母羊的群体中,每年选留20～30只测验公羊进行后裔测验,就可以获得理想的遗传进展。对于一个大的育种单位,测验公羊数应每年选留50～70只。 |
| 关键词: 中国美利奴羊 群体结构 优化育种方案 模型计算 基因流动法 |
| DOI： |
| 投稿时间：1993-07-09 |
| 基金项目:国家博士后科学基金 |
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| Effect of Population Size on Genetic Gain for Merino Sheep in China |
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| Abstract: |
| The model calculation for optimization of breeding programs for Merino in China was car- ried out in order to study effect of the population size on genetic gain under consideration of proportion of testing ewe and number of testing rams.The results were as follows:The breeding return and moetary genetic gain are highly increase with the population size increased in 20000 to 160000 ewes.The propor- tion of ewes that are mated with testing rams would be increased to 50% in the breeding population.In a popula... |
| Key words: Chinese Merino population structure optimized breeding programs model calculation gene flow method |
