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.%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0～21 d.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.
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