关键词: 干旱, 干旱

Abstract: This experiment was conducted to investigate the effects of low-protein diets on slaughter performance and composition of breast meat of Chinese color-feathered chicken. One thousand nine hundred and eighty one-day-old Chinese color-feathered chickens (Hetian Chickens) were randomly allocated to 2 groups with 3 replicates per group and 330 chickens per replicate. Chickens were fed with 4-phase (1-28d, 29-42d, 43-75d, 76-105d). Two diets were formulated for each phase. The control group fed diets with amino acid patterns and crude protein levels of Chinese color-feathered chicken according to NY/T 33-2004. The experimental group fed diets with amino acid patterns of broiler according to NRC (1994), but the crude protein levels were decreased 1 percentage based on the control diet, respectively. Chickens were slaughtered and mensurated composition of breast meat on 105-day-old. The results showed as follows: (1) There were no significant differences in percentage of half evisceration (PHE), percentage of evisceration (PE), percentage of breast meat yield (PBM), percentage of thigh meat yield (PTM), percentage of abdominal fat (PAF), subcutaneous fat pad(SFP), intermuscular fat(IMF) (P>0.05). (2) No significant differences in moisture, crude protein, ether extract and amino acid of breast meat were found between 2 groups (P>0.05). The results suggested that reducing dietary crude protein level 1 percentages have no significant effects on slaughter performance and composition of breast meat of Chinese color-feathered chicken.