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The association of IGF-I gene polymorphisms with certain traits in 708 individuals of two Chinese dairy-goat breeds (Guanzhong and Xinong Saanen) was investigated. Polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing methods were employed in screening for genetic variation. Two novel mutations were detected in the 5'-flanking region and in intron 4 of IGF-I gene, viz., g.1617 G &gt; A and g.5752 G &gt; C (accession D26119.2), respectively. The associations of the g.1617 G &gt; A mutation with milk yield and the body size were not significant (p &gt; 0.05). However, in the case of g.5752 G &gt; C, Xinong Saanen dairy goats with the CG genotype presented longer bodies (p &lt; 0.05). Chest circumference (p &lt; 0.05) was larger in Guanzhong goats with the GG genotype. In Xinong Saanen dairy goats with the CC genotype, milk yields were significantly higher during the first and second lactations (p &lt; 0.05). Hence, the g.5752 G &gt; C mutation could facilitate association analysis and serve as a genetic marker for Chinese dairy-goat breeding and genetics.

Association of IGF-I gene polymorphisms with milk yield and body size in Chinese dairy goats