Zinn R A
J Anim Sci. 1986 Dec;63(6):2013-7. doi: 10.2527/jas1986.6362013x.
Two metabolism trials were conducted to evaluate the influence of therapeutic antibiotic supplementation on characteristics of digestion of growing and finishing diets. Treatments consisted of a basal diet supplemented with: no antibiotics, 350 mg chlortetracycline and 350 mg sulfamethazine and 700 mg chlortetracycline and 700 mg sulfamethazine. In trial 1, treatment effects were evaluated in a replicated 3 X 3 Latin-square design experiment involving six crossbred steers (462 kg) with cannulas in the rumen and proximal duodenum. The basal diet contained (dry matter basis) 16.1% alfalfa hay, 72% steam flaked corn, 3.3% molasses, 5.8% fat, .96% urea, .79% limestone, .50% trace mineral salt, 33 mg/kg lasalocid, 2,200 IU/kg vitamin A and .44% chromic oxide. Dry matter intake was limited to 1.4% of body weight. In trial 2, treatment effects were evaluated in a 3 X 3 Latin-square design experiment involving three steers (399 kg) with cannulas in the rumen and proximal duodenum. The basal diet contained (dry matter basis) 10.1% sudangrass hay, 34.9% alfalfa hay, 43.9% steam flaked corn, 6.1% molasses, 4.0% fat, .46% urea, .49% trace mineral salt, 33 mg/kg lasalocid and 2,200 IU/kg vitamin A. Dry matter intake was limited to 1.65% of body weight. Antibiotic supplementation did not influence microbial efficiency, passage of microbial and feed N to the small intestine, or either ruminal or total tract digestion of organic matter and acid detergent fiber in either growing or finishing diets (P greater than .20).(ABSTRACT TRUNCATED AT 250 WORDS)
进行了两项代谢试验，以评估治疗性抗生素添加对生长育肥日粮消化特性的影响。处理组包括基础日粮添加：不添加抗生素、350毫克金霉素和350毫克磺胺二甲嘧啶、700毫克金霉素和700毫克磺胺二甲嘧啶。在试验1中，在一个重复的3×3拉丁方设计试验中评估处理效果，该试验涉及6头杂种阉牛（462千克），瘤胃和十二指肠近端装有插管。基础日粮（干物质基础）含有16.1%苜蓿干草、72%蒸汽压片玉米、3.3%糖蜜、5.8%脂肪、0.96%尿素、0.79%石灰石、0.50%微量矿物质盐、33毫克/千克拉沙洛西钠、2200国际单位/千克维生素A和0.44%氧化铬。干物质摄入量限制为体重的1.4%。在试验2中，在一个3×3拉丁方设计试验中评估处理效果，该试验涉及3头阉牛（399千克），瘤胃和十二指肠近端装有插管。基础日粮（干物质基础）含有10.1%苏丹草干草、34.9%苜蓿干草、43.9%蒸汽压片玉米、6.1%糖蜜、4.0%脂肪、0.46%尿素、0.49%微量矿物质盐、33毫克/千克拉沙洛西钠和2200国际单位/千克维生素A。干物质摄入量限制为体重的1.65%。在生长育肥日粮中添加抗生素对微生物效率、微生物氮和饲料氮进入小肠的通过率、瘤胃或全消化道有机物和酸性洗涤纤维的消化均无影响（P大于0.20）。（摘要截短至250字）
