Document Type : Research Paper
Associate professor at Faculty of Veterinary Medicine, University of Tehran
Assistant professor at Faculty of Agricultural Science, University of Tabriz-Tabriz
Professors, University College of Agriculture & Natural Resources, University of Tehran-Karaj
Assistant professor at Sari Agricultural Sciences & Natural Resources University
Assistant professor at Razi Vaccine and Serum Research Institute-Karaj
Associate Professor at School of Public Health, Tehran University of Medical Sciences
The objective of the present study was to investigate the effects of high dietary levels of L-arginine during starter period on growth, intestine morphology and immune system of female Ross broiler chicks. In this experiment, 192 day old female Ross broiler chicks were fed with 4 dietary treatments in a completely randomized design, in which each dietary treatment included 4 replications. Dietary treatments included 100%, 153%, 168% and 183% of digestible arginine, based on the Ross recommendation, and were fed from day 1 to 10. On d 10 of the experiment, chicks were weighed and feed consumption was recorded. Then, three chicks per replication were slaughtered in order to survey intestinal histology and immune system. The results showed that high dietary levels of arginine had an increasing effect (P<0.01) on 10th day body weight, feed efficiency, immune system characteristics, weight and length of small intestine, and its villus height and crypt depth. According to the results of this study, 168% digestible arginine, based on the Ross recommendation, had the best desirable results on growth improvement of broiler chicks and it also improved weight, length and histology of small intestine, and immune characteristics.