关键词: 半细毛羊[49ME], 遗传结构, 基因频率[45CC], 横交群, 遗传距离

Abstract: The genetic structure of Liangshan intercrossing semifrne-wool sheep was studied by investigation four loci, Haemoglobin(HB), Transferrin(TF), Postalbumin(Po) and Prealbumin(PR). The results showed that except HB locus, the loci of TF, Po and PR were on Hardy-Weinberg equilibuium system, The unequilibrium of HB locus was due to both nature and artificial selection. The genetic distance between the sheep groups in the four pastures was from 0.9 to 2.0. Based on gene frequencies of the four loci, the sheep groups of the four pastures could be classified into two clusters, one including the sheep groups of Haogu pasture, Xuke pasture and Zhuhe pasture, another the sheep group of Luojishan pasture.

Key words: SEMIFINE-WOOL SHEEP, GENETIC STRUCTURE, GENE FREQUENCY, INTERCROSSING, GENETIC DISTANCE