Evaluation Of The Net Energy Value Of Rapeseed Meal, Cottonseed Meal And Wheat Bran, Rice Bran And Its Influence On Performance And Nitrogen Utilization For 0-3-week-old Yellow Plumage Broiler

Two experiments were designed in this study. Experiment 1 was conducted to assay the net energy (NE) of rapeseed meal, cottonseed meal, wheat bran and rice bran by comparative slaughter method combined with regression and substitution methods, and the accuracy of feed NE values and the NE requirement of the broiler were validated in Experiment 2. Experimentl Determination of the NEs of Rapeseed meal, Cottonseed meal, WheatBran and Rice Bran for 0～3-week-old Yellow Plumage Broiler NE was calculated as NE for maintenance (NEm) plus NE for deposition(NEp). The values of NEm were evaluated by regression method and the values of NEp were measured by the method of substitution.190 7-d-old (empty body weight 62.87±2.1g, fasted 36 hours) yellow broiler chicken were used in the experiment.10 birds were killed as control.60 birds were used in regression method to determine the NEms.120 birds were used to determine the NEps of rapeseed meal, cottonseed meal, wheat bran and rice bran in comparative slaughter method. NEm were evaluated with one ad libitum feeding group and four restricted feeding treatments (20%,40%,60%,80% of the whole ad libitum feeding value) and NEp were evaluated with ten treatments (four basal diets and six replacement diets). Each treatment has six replications of two chickens. The experimental lasted from 7 to 14 days of age (total 7 days). The net energy requirement for maintenance were 428.12KJ/kg BW0.75 per d for 0～21-d-old Yellow Plumage Broiler at 30±2℃circumstance.NEs of corn, soybean meal,rapeseed meal, cottonseed meal, wheat bran and rice bran were 11.49,7.62,5.20,9.86,4.90, 5.22 MJ/kgDM, respectively. (using regression method, NEm=428.12KJ/kgBW0.75*d) Experiment2 Effects of Different Diets on Performance and Nitrogen Utilization for 0～3-week-old Yellow Plumage Broiler 360 1-day-old male broilers with an average weight of 38.8±2.3 g were randomly allocated into 6 treatments with 6 replicates of 10 chickens, feeding on corn-soybean meal diets(basal diets) and the different ratios basal diets with the addition of 20% wheat bran,20% rice bran,10% rapeseed meal, and 10% cottonseed meal, or with the mixed addition of 10% wheat bran and 10% rice bran,7% cottonseed meal and 7% rapeseed meal, respectively. The experiment lasted 21 days. Body weight and feed intake were measured on the 1st and 21st day, respectively, to monitor the average daily gain(ADG), average daily feed intake(ADFI), feed/gain ratio(F/G) and nitrogen utilization. The feeding experiment showed that F/G was not affected by dietary treatments (P>0.05). There were no differences (P>0.05) in ADG and ADFI among treatments except the mixing group compared with corn-soybean meal diet (P<0.01). Nitrogen deposition in cottonseed meal treatment were a little higher(P<0.05) than that in other treatments, but there were no differences among other treatments(P> 0.05). The accuracy of the NE values could be assayed by comparative slaughter method combined with regression and substitution methods and and the formulated diet which NE and TDLys requirement suggested by YU can achieve the same performance.