Evaluation of Metabolizable Energy Value and Amino Acid Standard Ileal Digestibility of Corn for Fast-Growing Yellow-Feathered Broilers
The objective of this study was to evaluate the metabolizable energy value and amino acid standard ileal digestibility(SID)of corn for fast-growing yellow-feathered broilers.Additionally,a prediction model for apparent metabolizable energy(AME)was constructed based on the effective chemical components of corn.Experiment 1 was to evaluate the AME and nitrogen corrected apparent metabolizable energy(AMEn)of corn for fast-growing yellow-feathered broilers.A total of 396 Xiangjia yellow chicken No.2 male broilers(fast-growing yellow-feathered broilers)were randomly divided into 11 groups with 6 replicates per group and 6 broilers per replicate.Broilers in one group were randomly selected to feed a basal diet,and the others in 10 groups were fed experimental diets.The experimental diets were prepared with 40％of the basal diet replaced by corns from different sources.The experiment comprised two stages:stage 1(12 to 18 days old)and stage 2(33 to 39 days old).Experiment 2 was to evaluate the amino acid SID of corn for fast-growing yellow-feath-ered broilers.A total of 396 Xiangjia yellow chicken No.2 male broilers were randomly divided into 11 groups with 6 replicates per group and 6 broilers per replicate.Broilers in one group were randomly selected to feed a nitrogen-free diet,and the others in 10 groups were fed experimental diets with different sources of corns as the main raw materials.The experiment comprised two stages:stage 1(14 to 18 days old)and stage 2(35 to 39 days old).The results were as follows:1)the means of dry matter(DM),crude protein(CP),ether extract(EE),crude fibre(CF),crude ash(Ash),neutral detergent fiber(NDF)and acid detergent fiber(ADF)contents of corn from 10 different sources were 85.67％(84.95％to 86.15％),7.40％(6.73％to 8.24％),2.87％(2.43％to 3.04％),3.43％(1.12％to 6.18％),0.90％(0.67％to 1.12％),14.00％(12.49％to 16.09％)and 2.74％(2.40％to 3.07％),respectively,and the mean of gross energy(GE)was 18.55 MJ/kg(18.25 to 18.74 MJ/kg).2)On the basis of DM,the means of AME and AMEn for 10 corns of fast-growing yellow-feathered broilers at 12 to 18 days of age and 33 to 39 days of age were 12.96 and 12.62,13.06 and 12.73 MJ/kg,respectively.3)The highest SID of essential amino acids of fast-growing yellow-feathered broilers at 14 to 18 days of age was histidine with a mean of 82.53％.The highest SID of es-sential amino acids of fast-growing yellow-feathered broilers at 35 to 39 days of age was methionine with a mean of 86.97％.4)The best prediction equation for fast-growing yellow-feathered broilers at 12 to 18 days of age was AME(MJ/kg)=41.26-0.10DM+1.00EE-0.94CP-0.49CF-7.46Ash-0.16NDF-1.88ADF(R2=0.78,P=0.593).The best prediction equations for fast-growing yellow-feathered broilers at 33 to 39 days of age were AME(MJ/kg)=15.28-2.37Ash(R2=0.47,P=0.029)and AME(MJ/kg)=-25.19+0.52DM+1.56EE-0.43CP-0.12CF-5.23Ash+0.02NDF-0.84ADF(R2=0.94,P=0.195).In conclusion,there were great differences in AME,AMEn and amino acid SID among different sources of corn,and Ash was the best predictor for AME of corn in fast-growing yellow-feathered broilers.[Chinese Journal of Animal Nutrition,2024,36(9):5669-5681]
cornXiangjia yellow chicken No.2AMEAMEnprediction modelamino acid standard ileal digestibility
万方数据
维普
