The area proportions of different types of muscle fibers were studied in the breast and leg muscles of Gushi chickens at different stages （4,8,12,16 week） and the total area of red and middle muscle fibers （SR＋M）,the area of middle muscle fiber （SM） and the area of white muscle fibers （SW） were determined. Muscle fibers were observed by succinate dehydrogenase （skhhase） staining. The results showed that the muscle fibers were divided into three types ：red muscle fibers ,white fibers and the middle fibers. With the growing of Gushi Chicks,the proportion of white fibers of the leg muscle gradually decreased, meanwhile,in the breast muscle it rose at first then began to decrease. For Gushi male,there were no significant differences in leg muscle among the SR＋M/SW ratios at the 4th, the 8th and the 12th week （P〉0.05） and there were significant differences between the SR＋M/SW ratios of the 8th, 12th week （P〈0.05） and there were extremely significant differences between the SR＋M/SW ratios of the 4th,the 16th week （P〈0.01）. For Gushi female, there were no significant differences in leg muscle between the SR＋M/SW ratios at all stages （P〉0.05）. For Gushi male,there appeared no significant differences in chest muscle between the SM/SW ratios at all stages （P〉0.05）. For Gushi female,there were no significant differences in chest muscle between the SM/SW ratios of the 8th and the 12th weeks （P〉0.05）,but there were extremely significant differences between the other SM/SW ratios （P〈0.01）. The proportion of red muscle fiber and middle muscle fiber of leg muscle and the proportion of middle muscle fiber of chest muscle were higher for male chicken than for female chicken.
Journal of Northwest Sci-Tech Univ of Agr and
muscle fiber type