Ruiz N, Harms R H
Department of Poultry Science, University of Florida, Gainesville 32611.
Poult Sci. 1990 Dec;69(12):2231-4. doi: 10.3382/ps.0692231.
An experiment involving 1296 Cobb feather-sexed broiler chickens was conducted to determine their need for supplemental niacin from 3 to 7 wk of age when fed a corn-soybean meal diet. Birds were raised in litter floor pens to 3 wk of age and fed a diet that met or exceeded the 1984 National Research Council nutritional requirements. From 3 to 7 wk of age, birds were assigned to six dietary treatments consisting of 0, 3, 6, 12, 24, and 36 mg of supplemental niacin/kg of feed. Twelve replicate pens (six per sex) were fed each dietary treatment. The corn-soybean meal basal diet (unsupplemented with niacin) contained by analysis 21.3% crude protein, 23% tryptophan, and 22 mg of niacin/kg of feed. Birds were weighed at 3 and 7 wk of age on a per pen basis. The body weight gain, total feed intake, and feed conversion were determined for male and female chickens between 3 and 7 wk of age. There were no significant differences in body weight gain (P = .67), feed intake (P = .36), and feed conversion (P = .12) due to dietary treatments. Treatment by sex interaction was not significant for body-weight gain (P = .53), feed intake (P = .76), and feed conversion (P = .53). It was concluded that a corn-soybean meal diet containing 22 mg of niacin/kg (from corn and soybean meal) and .23% tryptophan was adequate for optimum growth and feed conversion of broiler chickens from 3 to 7 wk.
进行了一项涉及1296只科布羽色自别雌雄肉鸡的试验，以确定它们在3至7周龄饲喂玉米-豆粕型日粮时对烟酸补充剂的需求。雏鸡在垫料平养栏中饲养至3周龄，并饲喂满足或超过1984年美国国家研究委员会营养需求的日粮。从3至7周龄，将雏鸡分为六种日粮处理组，分别添加0、3、6、12、24和36毫克/千克饲料的烟酸补充剂。每种日粮处理设12个重复栏（每个性别6个）。经分析，玉米-豆粕基础日粮（未添加烟酸）含21.3%粗蛋白、0.23%色氨酸和22毫克/千克饲料的烟酸。在3周龄和7周龄时逐栏称取雏鸡体重。测定了3至7周龄雌雄雏鸡的体重增加、总采食量和饲料转化率。日粮处理对体重增加（P = 0.67）、采食量（P = 0.36）和饲料转化率（P = 0.12）均无显著影响。性别与处理的交互作用对体重增加（P = 0.53）、采食量（P = 0.76）和饲料转化率（P = 0.53）均无显著影响。得出的结论是，含22毫克/千克（来自玉米和豆粕）烟酸和0.23%色氨酸的玉米-豆粕型日粮足以满足3至7周龄肉鸡的最佳生长和饲料转化率需求。
