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级进杂交绵羊微卫星基因杂和度与生长性能的关系

DOI: 10.7685/j.issn.1000-2030.2006.01.015, PP. 67-71

Keywords: 绵羊,级进杂交,微卫星,杂合度

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Abstract:

利用10个微卫星基因座对陶赛特绵羊及其与新疆细毛羊级进杂交一代、二代和三代4个绵羊群体进行了遗传学检测,计算出各个群体的平均杂合度和平均生产性能的数值,分析群体杂合度与生产性能间的相关系数和变化趋势。结果表明随级进杂交程度的增加,群体的杂合度逐渐降低,趋向于陶赛特群体的杂合度;微卫星标记杂合度与各个时期的体重、体高、体长和管围间呈正相关,其中杂合度与各个时期的体长呈显著正相关,而与各个时期的胸围呈负相关。微卫星基因杂合度对各个时期生长性能的相关效应在不同级进杂交群体间存在一定的差异。由此得到3点启示(1)基因杂合度与生长性能间不是简单的相关关系;(2)级进杂交可使有害基因与中性标记连锁遗传,从而部分或全部抵消杂合优势的表现,甚至出现杂合劣势;(3)不同时期基因间的互作对于性状的作用是不一样的。

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