Study Of Assessment Methods Of Energy And Protein In Laying Hens' Feed

Experiment 1 Sdudy of Assessment Substitution of Energy and Protein Values between Roosters and Laying hensThis experiment was conducted to evaluate ten kinds of diet value by testing the apparent metabolism energy (AME) and the apparent digestibility of crude protein between comb white leghorn roosters and layers. Ten feed sources were corn, wheat, sorghum, paddy and bran(P<0.05), and the average AME values in White leghorn layers were higher than that in white leghorn roosters as much as 1.73MJ/kg, 0.71MJ/kg, 0.35MJ/kg and 0.95MJ/kg, respectively. There was no significant difference of AME in paddy between hens and roosters (P>0.05). No significant differences of AME were found on soybean, cotton seeds, rapeseed, peanut and fish between hens and roosters (P>0.05). There were no significant difference of apparent digestibility of crude proteins between hens and roosters on energy feeds like corn, wheat, sorghum, paddy and bran (P>0.05). The apparent digestibility value on protein feeds like soybean, rapeseed and peanut on hens highered 7.86%, 9.95% and 5.67% than that on roosters (P<0.05). No significant difference of apparent digestibility was found on cotton seed and fish meal (P>0.05).Experiment 2 Study of Substitution and Empting-force Fed Method on The Assessment of Energy and Protein Values between Roosters and Laying hensThis experiment was conducted to evaluate the difference between substitution and empting-force fed method. Forty eight adult white leghorn roosters with similar body weight were selected. Two methods were used to test the AME and apparent digestibility of crude protein. The results showed that the AME values of corn, wheat, sorghum and paddy were significant difference between hens and roosters tested by the two methods (P<0.05). The AME values tested by empting-force fed method on corn and wheat highered 0.83MJ/kg and 1.37MJ/kg than that tested by substitution, respectively. The AME values tested by empting-force fed method on sorghum and paddy lowered 1.22MJ/kg and 1.49MJ/kg than that tested by substitution. There was no significant difference between two methods on bran (P<0.05). The AME value was difference between two methods on soybean and fish meal (P<0.05), and the value tested by substitution on soybean lowered 1.89MJ/Kg than that tested by empting-force fed method, but the value tested by substitution on fish meal highered 1.13MJ/kg than that tested by empting-force fed method. No significant difference of the AME value was found on rapeseed, cotton seed and peanut (P>0.05). The apparent digestibility of crude protein was significant difference between the two methods on energy feeds such as corn, wheat, paddy and bran (P<0.05), and the value tested by empting-force fed method highered 7.44%, 5.56%, 3.8%, 5.36% and 6.74% than that tested by substitution. The apparent digestibility on protein feeds like soybean, rapeseed, cotton seed, peanut and fish meal were significant difference (P<0.05), and thevalue tested by substitution on soybean, rapeseed, cotton seed and peanut meal lowered 10.19%, 11.84%, 14.51% and 14.87% than that tested by empting-force fed method, respectively, while the value on fish meal was 6.5% higher.