选择作用下家鸡淀粉酶的遗传多态性研究──基因频率分化、相关效应估计和标记辅助选择试验  

Plasma Amylase Polymorphism under Selection

作　　者：吴晓林[1] 肖千钧[1] 项可宁[1] 戴英红[2] 

机构地区：[1]湖南省畜牧兽医研究所家禽育种中心,长沙410131 [2]湖南省洪江市种鸡场,洪江418200

出　　处：《遗传》1999年第2期29-32,共4页Hereditas（Beijing)

基　　金：湖南省自然科学基金;湖南省科委攻关计划资助

摘　　要：对“三黄”鸡4个品系的血液淀粉酶（Amy-l）基因频率进行了估计，结果表明：Amy-l基因频率具有明显的品系特异性，父系Amy－lA高；母系Amy-lB频率高．人工选择可能是导致两个具有相同遗传来源的品系（Ⅱ系和Ⅲ系）Amy-l基因频率发生分化的原因．利用线性模型估计了Amy－l基因的加性效应，结果表明：Amy-lB有利于产蛋性能，而Amy－l4有利于体重和蛋重的提高。标记辅助选择试验结果表明，选择Amy-l传型来改变家禽品系类型是可能的，但效果有限，因此，对Amy-l的选择应结合于综合的选择方案之中．Gene frequencies at Aam-I locus were estimated in 4 grand-parent lines of yellow broilers.The results indicated that the male lines exhibited higher frequency of Amy-lA while the female lines werefeatured by higher frequency of Ac-IB. Differentiation in gene frequencies at Aam-l locus in line Ⅱand Ⅲ, which were of identical origin, might be attributable to varied history of selection. Estimation ofgenotypic and gene effects suggested that Aam-lB was associated with higher laying performance, whileAam-lA was favorable for increased body and egg weights. It was also revealed that changing types ofPOultry lines by means of altering genotypes at locus Aam-I was feasible, but its effect was limited.Accordingly, it is preferable to incoporate biochemical marker-assisted selection into complex programsof selection.

关 键 词：淀粉酶 遗传多态性 遗传标记 选择试验 

分 类 号：S831.2[农业科学—畜牧学]