Buresh R E, Harms R H, Miles R D
Poult Sci. 1986 Dec;65(12):2314-7. doi: 10.3382/ps.0652314.
Two experiments, each consisting of two trials, were conducted with day-old Nicholas Large White turkey poults to compare the effectiveness of four antibiotics for growth promotion and the utilization of sulfur amino acids. A corn-soybean meal basal diet that contained no supplemental methionine, choline, or inorganic sulfate was used in order to furnish nutritional stress. The diet was calculated to contain 25.4% protein, .448% methionine, .403% cystine, 1014 mg/kg choline, and 2990 kcal metabolizable energy/kg. In Experiment 1, a 2 X 4 factorial arrangement of treatments was used. This included two levels, (0% (control) and .18%), of supplemental DL-methionine and no antibiotic or bacitracin MD, flavomycin, or virginiamycin; antibiotics were fed at 50, 2, and 20 g/ton, respectively. In Experiment 2, lincomycin also was included as a treatment (at 4 g per ton) resulting in a 2 X 5 factorial arrangement of treatments. Only the addition of Virginiamycin to the control diet in Experiment 1 resulted in significantly increased body weights. Supplementation by .18% methionine increased body weights and feed efficiency. In addition, all three antibiotics increased body weights significantly when added to the .18% methionine diets. Feed efficiency values were improved by all four antibiotics at both methionine levels. In Experiment 2, increases in body weights similar to those in Experiment 1 were obtained with the addition of .18% methionine to the basal diets. Addition of lincomycin and virginiamycin improved body weights and feed efficiencies in the presence and absence of supplemental methionine.
用一日龄的尼古拉斯大白火鸡雏进行了两项实验，每项实验包含两次试验，以比较四种抗生素对生长促进及含硫氨基酸利用的效果。使用了不含额外蛋氨酸、胆碱或无机硫酸盐的玉米 - 豆粕基础日粮，以造成营养应激。该日粮经计算含有25.4%的蛋白质、0.448%的蛋氨酸、0.403%的胱氨酸、1014毫克/千克胆碱以及2990千卡/千克代谢能。在实验1中，采用了2×4析因处理安排。这包括两个水平，即0%（对照）和0.18%的额外DL - 蛋氨酸，且不添加抗生素或杆菌肽MD、黄霉素或维吉尼亚霉素；抗生素分别以50克/吨、2克/吨和20克/吨的量投喂。在实验2中，林可霉素也作为一种处理方式（4克/吨）加入，从而形成2×5析因处理安排。仅在实验1的对照日粮中添加维吉尼亚霉素导致体重显著增加。添加0.18%的蛋氨酸可增加体重和饲料效率。此外，当添加到含0.18%蛋氨酸的日粮中时，所有三种抗生素均显著增加了体重。在两个蛋氨酸水平下，所有四种抗生素都提高了饲料效率值。在实验2中，基础日粮添加0.18%蛋氨酸后获得了与实验1中相似的体重增加。在添加和不添加额外蛋氨酸的情况下，添加林可霉素和维吉尼亚霉素均提高了体重和饲料效率。
