Abstract:

As the environment friendly diet provide theoretical basis, this study intends to screen Fujian scale Hailan laying hen production required for the best optimal amino acid model and the best low protein level. An experiment was conducted using a total of 1620 21-weeks-old Hy-line brown layers of similar weight and healthy to investigate the effects of different amino acid model and level of protein on the production performance, blood biochemical index and nitrogen, phosphorus utilization and excretion during 22~72 weeks of age. Experiment was treated by a 2×3 factorial design with 6 dietary treatments (3 replicates of 90 birds per treatment) for 50 weeks, amino acid model (NRC and the varieties) and levels of crude protein (17%, 16.25%, 15.5%). The results from this study indicated that two amino acid model and amino acid model and crude protein levels of interaction between observations of all indexes were not significant differences (P>0.05); The different crude protein levels on egg laying rate, average egg weight and feed-egg ratio had significant effect (P<0.05), on feed intake had not significant difference (P>0.05), Crude protein levels on UA, UN, ALP, TP had no significant influence (P>0.05). Comprehensive indexes two amino acids model were by 16.5% crude protein level for the best.