应用DNA指纹技术研究湖北白猪的杂种优势

Studies on Heterosis of Hubei White Pigs by DNA Fingerprint Technique

本研究利用ＤＮＡ指纹技术，通过人源小卫星探针３３６分析湖北白猪Ⅲ系、Ⅳ系，长白与杜洛克的遗传纯度与遗传距离，通过分析遗传距离与杂交组合试验资料表明，湖北白猪Ⅲ系（或Ⅳ系）与杂交品种间遗传距离大时，杂交组合的日增重、饲料转化率、瘦肉率、繁殖性状的杂种优势大；反之，遗传距离小时，其主要性状的杂种优势相应较小，根据杂交组合间的遗传距离可以预测杂交组合的杂种优势。

enetic purity and distance among Hubei White Pigs Line Ⅲ (HWⅢ),HWⅣ,Landrace and Duroc were studied by DNA fingerprinting method with human microsatellite probe 33.6,After data of genetic distance and crossing combination test were analyzed.It showed that the bigger the genetic distance between HWⅢ or HWⅣ and its crossing breed,the higher the heterosis of average daily gain,feed conversion ratio.lean meat percentage and production traits.In the contrary,the smaller the genetic distance,the lower the major performance traits.Heterosis can be predicted by the genetic distance between crossing groups.