Study on pig growth hormone gene polymorphisms in western meat-type breeds and Chinese local breeds

Chinese Meishan and Jiangquhai pigs are two of the most prolific pigs in the world, but their growth rate is lower than that of Duroc, Landrace and Pietrain pigs. It is suggested that growth rate is regulated by growth hormone. The objective of the current study was to analyze the porcine growth hormone (pGH) gene polymorphisms based on the polymerase chain reaction restriction fragment-length polymorphism method (PCR-RFLP) for three western meat-type breeds (Duroc, Landrace and Pietrain) and two local Chinese pigs (Meishan and Jiangquhai). Five polymorphic restriction sites were detected with theApaI,MspI,BspI andHhaI restriction enzymes in two amplified fragments (605 bp, −119 to +486; 506 bp, +206 to +711). Breed difference was found only in the 506 bp fragment. There was no difference in allelic frequencies ofBspI andHhaI restriction sites among the five breeds (P>0.05). Landrace and Meishan pigs lacked alleleG3 ofMspI site. The alleleG3 frequency of restrictionMspI site of the 506 bp fragment in Pietrain pigs was higher than that in Duroc and Jianquhai pigs (P 0.05). This new and rapid PCR-RFLP typing method is an attractive tool for analysis of porcine growth hormone gene restriction sites. The differences inMspI andApaI restriction sites may explain the growth difference between the foreign meat-type breeds above mentioned and local Chinese pigs.