0～4周龄淮北麻鸡能量和蛋白质需要量

Energy and protein requirements of 0-4 weeks Huaibei Ma chicks

将810只初生淮北麻鸡随机分为27组,采用2因素3水平试验设计,日粮代谢能分别为10.90MJ/kg(低)、11.40MJ/kg(中)和11.90MJ/kg(高),粗蛋白分别为16.4%(低)、17.7%(中)和19.0%(高),研究0～4周龄淮北麻鸡的能量和蛋白质需要量。结果表明,日粮能量、蛋白质以及两者的交互作用均显著影响0～4周龄淮北麻鸡的生长性能、体成分和能量、蛋白质的沉积(P<0.05)。低能量+高蛋白组采食量显著高于其他处理组(P<0.01)。日粮能量由10.90MJ/kg提高到11.40MJ/kg,采食量下降,当继续提高能量时,对采食量的影响不明显,这一规律不受日粮蛋白质的影响;高能量+高蛋白组和低能量+低蛋白组生长性能高于其他组,中等能量组以及低能量中高蛋白组最差(P<0.01)。高能量+高蛋白质组饲料转化率显著优于其他各组。高能量+低蛋白质组组织中脂肪含量显著高于其他处理组,中能量+中蛋白质组和低能量+高蛋白质组最低(P<0.01)。各处理组中,低能量+低蛋白质组和高能量+低蛋白质组能量沉积率最高,中能量、中高蛋白质组最低(P<0.01)。0～4周龄淮北麻鸡日粮适宜代谢能和蛋白质分别为11.90MJ/kg、17.7%或10.90MJ/kg、16.4%。

The experiment was conducted to study the requirements of energy and protein of 0-4 wk Huaibei Ma chicks by investigating the effects of dietary ME （metabolizable energy） and CP （crude pro- tein） on growing performance, body composition, and deposition of energy and protein. Eight hundred and ten Huaibei Ma chicks of 1-d-old were assigned to 9 dietary treatments following a 4-week experi- mental period. Nine dietary treatments were formulated to contain 10. 90,11.40 and 11.90 MJ/kg ME and 19.0%,17.7%, and 16. 4% CP respectively. Dietary ME, CP and interaction between ME and CP had significant effects on growing performance, body composition, and deposition of energy and protein of 0-4 wk Huaibei Ma chicks （P〈0. 05）. Chicks fed with low-ME-high-CP diet had lower feed intake than that in other dietary treatments （P〈0. 01）. Average daily gain was significantly higher in chicks fed with high-ME-high-CP, high-ME-normal-CP and low-ME-low-CP diets, and was significantly lower in normal-ME and low-ME-high-CP diets （P〈0. 01）. Chicks had higher feed efficient in high-ME-high- CP treatment and had higher body fat percent in high-ME-low-CP treatment than that in other treat- ments （P〈0.01）. Highest energy deposition efficiency was found in high-ME-low-CP and low-ME-iow- CP treatments,and lowest in medium-ME-medium-CP treatment （P〈0. 01）. Highest nitrogen deposi- tion efficiency was found in high-ME-medium-CP treatment in 0-2 weeks and low-ME-low-CP diet in 0-4 weeks, and lowest in medium-ME-medium-CP dietary treatment （P〈0. 01）. There was no increase in ni- trogen deposition efficiency as ME increased in low CP diet and as CP increased in low ME diet. In con- clusion,ME and CP requirements in diet in 0-4 weeks Huaibei Ma chicks should be 11. 90 MJ/kg and 17.7% or 10. 90 MJ/kg and 16.4%.