impacts of dietary l-threonine supplementation on performance and intestinal morphology of broiler chickens during summer time

the present study evaluated effects of 0.0%, 0.5%, 0.75% and 1.0% l-threonine in diet on performance and gastrointestinal tract development in broiler chickens during summer. from 0 to 42 days old, body weight gain was greater in 0.75% l-threonine fed birds than in 0.0% and 0.5% l-threonine fed birds (p0.05). during the growth period, 0.75% l-threonine fed birds had the highest body weight gain (p0.05). in conclusion, supplementation of 0.75% l-threonine improved the intestinal morphology and body weight gain of broilers under hot conditions. as well as, the higher levels of l-threonine (1.0) percent in diet can will increased the villus height in the jejunum and ileum.