Effect of low protein diet supplemented with enzyme bacterial peptide compound on growth performance, slaughter performance and odor substances in excreta of broilers.

The experiment was to investigate the effect of adding compound enzyme peptides in low protein diet on growth performance, slaughter performance and odor in excreta of broilers. A total of 390 one-day-old Hubbard broilers were randomly divided into five groups, with six replicates in each group and 13 broilers in each replicate. Broilers in normal protein group (NP group) were fed with a basal diet (crude protein levels in early, middle and late periods were 22%, 20% and 19%, respectively), while broilers in low protein group (LP group) were fed with a low protein amino acid balance diet (crude protein levels in early, middle and late periods were 19%, 17% and 16%, respectively). The other experimental groups were supplemented with 0.2% (group I), 0.4% (group II) and 0.6% (group III) enzyme mycopeptide complex preparations on basis of LP group diet, respectively. The results showed that compared with NP group, the ammonia concentration at 14, 35, 42 d, indoles content and skocyanin content of broilers in LP group were significantly decreased (P<0.05). Compared with LP group, ammonia concentration in excreta of broilers in group I, group II and group III at 14 d was significantly decreased (P<0.05). Group III had the best economic benefit, and its profit was 3.09% higher than that of LP group and 8.98% higher than that of NP group. The European benefit index was 15.47% higher than that in LP group and 5.63% higher than that in NP group. The experiment indicates that adding proper amount of enzyme peptides compound preparation in low protein diet can reduce feed to gain ratio, the content of smelly substances in excreta and environmental pollution to a certain extent, and the appropriate dosage is 0.6%. [ABSTRACT FROM AUTHOR]