Abstract: The correlation between the polymorphism of 3′-flanking region in GH gene and growth traits of Luxi cattle was analyzed in our study. The results showed that the polymorphisms of 3′-flanking region in GH gene were caused by C→G transition at 2639 bp position, and three genotypes of AA, AB and BB were found at this position. Using the linear model of least squares fitting, the relationship between the polymorphism of GH gene and the three genotypes was analyzed, the results showed that the effect of AB genotype was higher than AA and BB genotypes on these traits of body weight, body height, body length, chest circumference and meat index (P＜0. 05); the effect of BB genotype was higher than AA genotype on these traits of body weight, body height, body length, chest circumference and beef purpose index(BPI), but the difference was not significant (P＞0.05). In conclusion, gene B could be used as dominant gene on the traits of body weight, body height, body length, chest circumference and BPI.

Key words: Luxi cattle; GH gene; growth traits; correlation analysis