不同粗蛋白和苏氨酸水平对生长前期北京鸭羽毛发育的影响

Effect of Dietary Crude Protein and Threonine on Feather Development of Starter Peking Ducks

采用2×5试验设计,研究了2个粗蛋白(CP)水平(14%和20%)和5个苏氨酸水平(0.50%、0.58%、0.66%、0.74%、0.82%)对生长前期北京鸭羽毛发育的影响。480只1日龄雄性北京鸭随机分为10组,每组6个重复,每个重复8只鸭。试验期为0～21d。结果表明,日粮粗蛋白和苏氨酸水平均极显著影响北京鸭产毛率,正羽百根质量、正羽长、绒羽千朵质量和绒羽长(P<0.01)。高CP水平下,日粮苏氨酸水平从0.74%增加到0.82%对正羽百根质量、正羽长、绒羽千朵质量和绒朵长均无显著影响(P>0.05)。在低CP水平下,苏氨酸极显著增加正羽百根质量、正羽长、绒羽千朵质量和绒朵长度(P<0.01)。因此,苏氨酸在羽毛早期发育中具有重要作用,羽毛发育需要高水平的苏氨酸。

A 2 × 5 factorial experiment containing two CP levels（14%, 20%）and five threonine levels（0.5%, 0.58%, 0.66%, 0.74% and 0.82%） was conducted to evaluate the effects of different CP and threonine levels on feather development of starter Peking ducks. Four hundred and eighty one-day-old male Peking ducks were randomly divided into 10 groups with 6 replicates in each group and 8 ducks in each replicate. These ducks were raised with experimental diets from 1 to 21 days of age. The results showed that threonine and CP in diets significantly affected the feather meat, one thousand downs weight, down length, one hundred plumages weight and plumages length（P〈0.01）. Dietary threonine levels from 0.74% to 0.82% did not affect feather reproduction rate, one thousand downs weight, down length, one hundred plumages weight and plumages length at higher dietary CP levels（P〉0.05）. However, dietary threonine levels from 0.74% to 0.82% significantly increased feather reproduction rate, one thousand downs weight, down length, one hundred plumages weight and plumages length at lower dietary CP levels（P〈0.01）. These results indicate that dietary threonine levels significantly affected feather development of starter White Peking ducks. Feather development need higher levels of threonine.