摘要
利用24个微卫星标记、7个生长发育性状和7个血液常规指标，构建了小尾寒羊、寒羊、山地绵羊、洼地绵羊4个山东地方绵羊品种及1个杂交羊（杜泊绵羊×小尾寒羊）群体的系统发生树，研究了群体间的生物相似性和遗传进化关系。结果表明，3种聚类方法的涵义不同，其结果有较大差异。从生物学性状上，在较近的地理距离内，不同绵羊品种生长性状和生理状态的差异显著（P〈0．01或P〈0．05），证明生态环境、饲养条件和选择方式对品种的形成具有重要影响。从遗传关系上，4个绵羊品种的GST和DST值分别为0．028和0．025，群体组合的FST值较低（0．0255～0．0390），FIS值较高（0．3601～0．4467），说明品种间遗传分化程度不高，亲缘关系较近，群体内近交程度较高，其基因流趋向与地理分布距离、遗传距离相一致，故防止无控制的近交和杂交是保持每个品种纯度的主要措施。
In this study, the dendrograms of four indigenous sheep breeds（Small Tailed Han sheep, Han sheep, Shandi sheep and Wadi sheep） and one crossing population（Dorper sheep × Small Tailed Han sheep）in Shandong province were constructed by using 24 microsatellite markers, 7 growth traits and 7 normal blood indexes, and,the relationship of biological comparability and genetic evolution between populations were explored. The results showed that, on biological traits, the growth traits and physiological states of different sheep breeds which lived in a closer geographical location were significantly different（P〈0.01 or P〈0.05）, suggesting that entironment, feeding conditions and selected modes play an important role in a breed forming. On genetic relationship, the GST and DST value of four indigenous sheep was 0. 028 and 0. 025 individually, and FST（0. 025 5-0. 039 0）was lower and FIS（0. 360 1-0. 446 7）was higher relatively, suggesting that the degree of genetic differentiation was not high. The relativeship was closer. The degree of inbreeding was high. The trend of gene flow was consistent with geographical distribution and genetic distance. So preventing that inbreeding and crossbreeding was out of control was the key measure in order to preserve the purity of each breed.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2006年第9期858-863,共6页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
山东省肉羊良种产业化开发(SD2003)
关键词
绵羊
生长性状
血液常规指标
微卫星标记
系统发生
indigenous sheep
growth trait
normal blood index
microsatellite marker
phylogenesis
