饲粮磷水平对快大型黄羽肉鸡生长性能、胫骨钙、磷沉积与灰分含量的影响OA

This experiment aims to explore the effects of different non-phytate phosphorus(NPP)levels on growth performance,tibia ash content as well as tibial calcium and phosphorus levels of fast-growing yellow-feathered broilers.A total of 600 male Jinling partridge chicks were selected for the experiment.A single-factor design with three different NPP levels(high,medium and low)was adopted in this trial,with 8 replicates per group and 25 chicks per cage,and the feeding period lasted for 70 days.Starter phase:0 to 28 days of age(dietary calcium level was set at 0.85%,and NPP levels were 0.33%,0.28%and 0.23%);grower phase:29 to 49 days of age(dietary calcium level was set at 0.80%,and NPP levels were 0.30%,0.25%and 0.20%);finisher phase:50 to 70 days of age(dietary calcium level was set at 0.75%,and NPP levels were 0.25%,0.20%and 0.15%).At the age of 1 to 28 days,broilers in the 0.28%NPP group had significantly higher final body weight and significantly lower feed-to-gain ratio than the other two groups(P<0.05).At the age of 29 to 49 days,broilers in the 0.25%NPP group had significantly higher final body weight and significantly lower feed-to-gain ratio than the other two groups(P<0.05).During 1 to 70 days of age,the ADFI of broilers in the 0.25%NPP group was significantly lower than that of the other two groups(P<0.05)with the lowest feed-to-gain ratio,but their final body weight at 70 days of age was significantly lower than that of the other two groups(P<0.05).Broilers fed low NPP levels(0.23%,0.20%,0.15%)had significantly higher ADG and final body weight than the other two groups,and their feed-to-gain ratio was second only to that of the medium NPP group.In terms of actual production benefits,the low phosphorus group had significantly higher final body weight than the other groups,its feed-to-gain ratio was second only to the medium phosphorus group,and the comprehensive economic benefits were obviously superior to the other two groups.