Izat A L, Colberg M, Reiber M A, Adams M H, Skinner J T, Cabel M C, Stilborn H L, Waldroup P W
Department of Animal and Poultry Science, University of Arkansas, Fayetteville 72701.
Poult Sci. 1990 Oct;69(10):1787-91. doi: 10.3382/ps.0691787.
Broilers were grown to 49 days of age on diets supplemented with bambermycins (BAM, 2.2 ppm), bacitracin methylene disalicylate (BMD, 27.5 ppm), virginiamycin (VM, 11 ppm), or an unmedicated control. Samples of birds were processed for dressing percentage and parts yield. There were no significant (P greater than .05) effects of antibiotics on final body weight, feed conversion, or mortality. In male broilers, BMD and VM significantly (P less than or equal to .05) increased dressing percentage and percentage yield and reduced the skeletal rack as a percentage of postchill weight compared to those fed the nonmedicated control. All antibiotics significantly increased breast skin weight and breast skin as a percentage of postchill weight of as compared with those fed the unmedicated control. In female broilers, BAM and BMD significantly increased dressing percentage and percentage yield and increased breast weight and breast as percentage of postchill weight as compared with those fed the unmedicated control diet. Females fed BMD also had significantly heavier leg quarters and breast skin than those fed the unmediated control. Females fed VM had increased breast skin weight and breast skin as a percentage of postchill weight than those fed the unmedicated control. The results of the present study indicate that antibiotics may influence dressing percentage and parts yield in the absence of improvements in body weight gain or feed utilization.
将肉鸡饲养至49日龄，日粮中分别添加了杆菌肽（BAM，2.2 ppm）、杆菌肽锌（BMD，27.5 ppm）、维吉尼亚霉素（VM，11 ppm）或不添加药物作为对照。对鸡只样本进行处理以测定屠宰率和各部位产量。抗生素对最终体重、饲料转化率或死亡率没有显著（P大于0.05）影响。在雄性肉鸡中，与饲喂无药对照日粮的肉鸡相比，BMD和VM显著（P小于或等于0.05）提高了屠宰率和出肉率，并降低了冷藏后体重中骨架的比例。与饲喂无药对照日粮的肉鸡相比，所有抗生素均显著增加了胸皮重量以及胸皮占冷藏后体重的比例。在雌性肉鸡中，与饲喂无药对照日粮的肉鸡相比，BAM和BMD显著提高了屠宰率和出肉率，并增加了胸肉重量以及胸肉占冷藏后体重的比例。饲喂BMD的雌性肉鸡的腿部和胸皮也显著重于饲喂无药对照日粮的肉鸡。饲喂VM的雌性肉鸡的胸皮重量以及胸皮占冷藏后体重的比例高于饲喂无药对照日粮的肉鸡。本研究结果表明，在不提高体重增加或饲料利用率的情况下，抗生素可能会影响屠宰率和各部位产量。
