Effects of crystalline amino acids supplemented with low protein diets on growth performance,serum biochemical indices and sslaughter performance of 21～60 days old linen hens
This experiment was conducted to investigate the effects of adding six crystalline amino acids(lysine,threonine,tryptophan,arginine,valine,L-Isoleucine)to a low protein diet on the growth performance,serum biochemical indexes and slaughter performance of green-footed Mama Hens.A total of 720 21-day-old green-footed Ma hens were divided into two groups:control group and experimental group.Six replications were carried out in each group,with 60 hens in each repetition.The crude protein levels of control group and experimental group were 19.6%and 16.5%respectively in 21～40 days,d-lys was 1%,and a consistent level of six amino acids(lysine,threonine,tryptophan,arginine,valine,L-Isoleucine)was achieved at the ideal amino acid model ratio.The crude protein levels were 18%,15%and 0.85%for D-lys,respectively,all the amino acids(lysine,threonine,tryptophan,arginine,valine,L-Isoleucine)were supplemented in proportion to the ideal amino acid model.The results showed that the growth performance,serum biochemical indexes and slaughter performance of the green-footed Ma Hens in the test group had no significant change compared with the control group(P＞0.05).In conclusion,the dietary crude protein level was reduced by 3%in the ideal amino acid model,and the growth performance,serum biochemical indexes and slaughter performance of 21-60-day-old green-footed Ma hens were not affected.
low protein dietcrystalline amino acidschicken with green feetgrowth performanceserum biochemical indexesslaughter performance
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