Evaluation of different methionine levels in standard and low-protein diets on performance traits, blood metabolite and intestine histology parameters of growing female Japanese quails

This experiment was conducted to investigate the different levels of methionine in Standard and Low-protein Diets on Performance, Carcass Traits, blood metabolite and histology Parameters of growing Female Japanese Quails in a completely randomized design with 2 × 3 factorial arrangement. This experiment was consisted of two levels of protein (recommended level (NRC1994) and 10% higher than recommended level) with three levels of methionine (NRC recommended, 10% lower and 10% higher than recommended). This study, conducted with total of 480, 14-d quails that consisted of 6 treatments and 4 replicates and each replicate consisted of 20 chicks. The raising period for performance evaluation ranged from 14 to 35 days. All experimental diets were differed at crude protein and methionine, but other nutrients was in amount that recommended by NRC 1994. The results showed that interaction of crude protein and methionine had significant effect on body weight at 28, 35 days of age (P<0.05). Protein level had significant effect on total FCR (P<0.05), so lower FCR was resulted from chicks with 100 recommended level and also methionine level was significantly affect total fcr, so the %110 methionine level had better FCR than other levels . Experimental treatments had no significant effect on carcass constitutes and Blood metabolite, in female quails. Villus area, villus height to crypt depth ratio, and villus height was affected significantly by interaction of CP and Met (P<0.05). In conclusion, NRC 1994 recommended CP diet with 110 % Met level can improve quail production traits ,