Mitochondrial DNA D-loop Variation and Genetic Background of Brahman Cattle

作     者：亐开兴 吴桂生 廖祥龙 金显栋 赵刚 杨国荣 袁希平 黄必志 文际坤 张亚平 QU Kai-xing;WU Gui-sheng;LIAO Xiang-long;JIN Xian-dong;ZHAO Gang;YANG Guo-rong;YUAN Xi-ping;HUANG Bi-zhi;WEN Ji-kun;ZHANG Ya-ping

作者机构：云南省肉牛和牧草研究中心云南昆明650212 中国科学院昆明动物研究所云南省畜禽分子生物学重点实验室分子进化与基因组多样性实验室 

出 版 物：《Zoological Research》 (动物学研究（英文）)

年 卷 期：2006年第27卷第6期

页      面：615-620页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0905[农学-畜牧学] 09[农学] 071007[理学-遗传学] 090501[农学-动物遗传育种与繁殖] 

基　　金：云南省自然科学基金(2003C0011Z,2004YX41) 云南省科技厅科技项目(2004NG04) 

主　　题：Brahman cattle mtDNA D-loop polymorphism genetic background 

摘      要：The complete mitochondrial DNA D-loop sequences from 10 stud Brahman cattle were sequenced and analyzed. The results showed that the genetic diversity of Brahman cattle was rich ; the rate of nucleotide variation, haplotype diversity and nucleotide diversity were 6.25%, 0.978± 0.054 and 0.014 30± 0.008 68, respectively. Nine haplotypes were defined and fell into two distinct lineages, suggesting that Brahman cattle have both Bos indicus （Zebu） and B. taurus genetic background. The taurine haplotypes were predominant at 90% and only Brah-6 belonged to the Asian zebu mthaplotype. This indicates that Brahman cattle was one of the zebu breeds and inherited the excellent characteristics of both the Asian zebu and European beef cattle, such as easy calf delivery, high quality beef, heat tolerance and resistance to various parasites. Breeders introduced Brahman cattle to improve the productivity and adaptability of native cattle. The Zebu has evidently frequently introgressed into the modem taurine breeds. As for modem zebu breeds, B. taurus also highly contributed to their formation, except for the Asian zebu. Furthermore our results also confirm the hypothesis that B. indicus has undergone a separate domestication event and originated from the Indian subcontinent.