Litter quality of broiler fed with to different levels of sulfur amino acid

Abstract

The objective of this study was to determine the effect of sulfur amino acid (methionine+cystine) supplementation included in the diet of broiler chickens raised under Brazilian commercial conditions on the concentration of ammonia gas, moisture, pH, temperature, and nitrogen excretion in litter on the 14th, 28th, and 42nd day of breeding. A total of 900 male chicks of the Cobb500 line were used, distributed in a completely randomized design with five treatments, with six replicates of 30 birds. A basal diet (without methionine) was formulated and was supplemented with DL-methionine (0.072, 0.168, 0.239, 0.311% and 0.058, 0.134, 0.192, 0.250% for days 1 to 21 and days 22 to 42 of breeding respectively) replacing the corn starch in order to achieve the desirable digestible methionine + cysteine levels (0.545 (basal diet), 0.616, 0.711, 0.782 and 0.853%) and (0.514 (basal diet); 0.571; 0.647; 0.704 and 0.761% and digestible methionine + cysteine for the phase 1 to 21 and 22 to 42 days of breeding, respectively. There was no significant effect on the temperature and concentration of ammonia gas in any of the phases evaluated. Met+cys supplementation influenced moisture and pH of litter in all the evaluated phases. For nitrogen, a significant effect was observed at 14 days, not exhibiting effects during the other phases, suggesting that nitrogen excretion increases with increasing levels of met+cys in the diet for up to 14 days.

The Impact of Hydrated Aluminosilicates Supplemented in Litter and Feed on Chicken Growth, Muscle Traits and Gene Expression in the Intestinal Mucosa

“…At that time, there was a change of feed from starter to grower 1. According to the information in the study of Carvalho et al [ 35 ], the nitrogen level increased after 14 days of rearing broiler chickens, which was caused by higher levels of methionine and cystine in the feed. No such relationships were found in the remaining rearing periods.…”