【摘要】 280只14日龄北京鸭平均分成4组,分别添加0、30、60、90、120 mg/kg烟酸进行4周饲养试验。测定平均屠宰率、全净膛率、胸肌率、腿肌率、皮脂率、腹脂率、日采食量(ADFI)、日增重(ADG)、料重比(F/G)、血清总胆固醇(TCH)、血清总甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)。结果表明:①日粮烟酸水平不影响屠宰率、全净膛率、皮脂率、腹脂率,但显著影响胸肌率、腿肌率,且随着烟酸水平的增加腿肌率表现出下降趋势。②日粮烟酸水平显著影响ADFI、ADG的含量,但不影响F/G,并与ADG存在极显著二次曲线关系。③日粮烟酸水平可能影响TCH、TG、LDL-C、HDL-C,但各处理间在0.05水平上无差异。当基础日粮烟酸和色氨酸水平分别为26.05 mg/kg和0.16%时,建议北京鸭后期烟酸添加水平为85 mg/kg。更多还原

【Abstract】 A total of 280 14-day-old Peking ducklings were divided into 4 groups fed with the dietary niacin(0,30,60,90 and 120 mg/kg) and then,average percentage of abatage,eviscerated carcass,breast,leg muscle,sebum cutaneum,abdominal,daily feed intake(ADFI),daily gain(ADG),feed conversion(F/G),serum total cholesterol(TCH),serum triglyceride(TG),high density lipoprotein cholesterol(HDL-C) and low density lipoprotein cholesterol(LDL-C) were respectively tested.The results showed :①the levels of niacin had no significant effect on the percentage of abatage,eviscerated carcass,ebum cutaneum and abdominal,but had significant effect on the percentage of breast and leg muscle,showing a degressive tendency;②the levels of niacin had significant effect on ADFI and ADG,but had no significant effect on F/G(P>0.05) and had a curve relationship with them(P<0.01);③the increased levels of niacin in the diet might effect TCH,TG,HDL-C and LDL-C,but the difference wasn’t significant(P>0.05).It was suggested that supplementation of dietary niacin of about 80 mg/kg would be appropriate to later stage ducklings,when basal diet contained 0.16% Trp and 26.05 mg/kg niacin.更多还原