The excreated 3-Methylhistidine was used to estimate the skeletal muscle protein degradation and protein synthesis rate in broiler chickens and rats.The skeletal muscle protein degradation and synthesis rate of 3-week-old broiler chicken were 3.63%/day and 11.71%/day, respectively.The reciprocal result of 60-day-old rats were 3.66%/day and 6.86%/day respectiv...