Izquierdo O A, Parsons C M, Baker D H
Department of Animal Sciences, University of Illinois, Urbana 61801.
Poult Sci. 1987 Oct;66(10):1652-9. doi: 10.3382/ps.0661652.
The effects of supplemental narasin (80 mg/kg) on several dietary factors were investigated in chicks infected with Eimeria acervulina. In Trial 1, chicks were fed a lysine-deficient corn-corn gluten meal diet containing graded increments of crystalline L-lysine.HCl with or without narasin. Supplemental narasin increased weight gain and feed efficiency at all lysine levels fed. Based upon slope-ratio methodology, efficiency of L-lysine utilization was virtually the same in both narasin-fed and control chicks. Trials 2 and 3 evaluated the effect of narasin on methionine utilization in crossbred chicks fed a methionine-deficient soy-feather meal diet supplemented with graded levels of DL-methionine. Narasin supplementation increased weight gain, feed efficiency, and utilization of supplemental methionine in chicks infected with E. acervulina (Trial 2), but had no effect on any of the performance parameters in uninfected chicks (Trial 3). The effects of dietary protein level and source and dietary electrolyte balance on the narasin response of commercial broiler chicks infected with E. acervulina were studied in Trials 4 and 5, respectively. In Trial 4, narasin supplementation increased performance in all cases, and protein source or level had no effect on the narasin response. In Trial 5, rate and efficiency of gain were improved as the electrolyte balance (meq Na + K-Cl/kg diet) increased from 100 to 250, with no further improvement being observed from 250 to 350 meq. Supplemental narasin improved performance and no interaction between electrolyte balance and narasin was observed.
研究了添加那拉菌素（80毫克/千克）对感染堆型艾美耳球虫雏鸡几种日粮因素的影响。在试验1中，给雏鸡饲喂含不同梯度结晶L-赖氨酸盐酸盐的赖氨酸缺乏玉米-玉米蛋白粉日粮，添加或不添加那拉菌素。在所有饲喂的赖氨酸水平下，添加那拉菌素均提高了体重增加和饲料效率。根据斜率比法，那拉菌素处理组和对照组雏鸡的L-赖氨酸利用率基本相同。试验2和试验3评估了那拉菌素对饲喂蛋氨酸缺乏大豆-羽毛粉日粮并添加不同水平DL-蛋氨酸的杂交雏鸡蛋氨酸利用率的影响。添加那拉菌素提高了感染堆型艾美耳球虫雏鸡的体重增加、饲料效率和补充蛋氨酸的利用率（试验2），但对未感染雏鸡的任何生产性能参数均无影响（试验3）。试验4和试验5分别研究了日粮蛋白质水平和来源以及日粮电解质平衡对感染堆型艾美耳球虫的商品肉鸡雏鸡那拉菌素反应的影响。在试验4中，添加那拉菌素在所有情况下均提高了生产性能，蛋白质来源或水平对那拉菌素反应无影响。在试验5中，随着电解质平衡（钠+钾-氯毫当量/千克日粮）从100增加到250，增重速率和效率提高，从250增加到350毫当量时未观察到进一步改善。添加那拉菌素提高了生产性能，未观察到电解质平衡与那拉菌素之间的相互作用。
