Boucque C V, Fiems L O, Casteels M, Cottyn B G, Buysse F X
National Institute for Animal Nutrition, Agricultural Research Centre-Ghent, Melle-Gontrode, Belgium.
Arch Tierernahr. 1988 Apr;38(4):317-26. doi: 10.1080/17450398809428298.
Two trials were conducted with 32 and 39 finishing Belgian white-red bulls, treated with anabolic agents during 55 to 60 days prior to slaughter. Xenobiotic androgens and estrogens, together with (Exp. I) or without progesterone (Exp. II) were injected at three-week intervals. Diets consisted of maize silage and 7.5 g concentrate daily per kg liveweight. Half of the animals within each experiment received an antibiotic for the entire fattening period lasting about 285 days. Lasalocid-sodium (Exp. I) and virginiamycin (Exp. II) were incorporated at 65 mg per kg concentrate. Anabolic agents improved average daily gain from 1.06 to 1.20 kg (P less than 0.10) and from 1.24 to 1.42 kg (P less than 0.05) respectively. In both trials steroidal growth promoters stimulated intake and improved feed efficiency (P less than 0.10). Feed antibiotics did not significantly affect daily gain during this short term finishing period. A reduced feed intake (P less than 0.05) and improved feed conversion were observed for lasalocid, while there was no difference for virginiamycin. Dry matter intake amounted to 80.5 and 76.3 g per kg metabolic weight and 9.02 and 8.41 kg per kg gain, respectively for control and lasalocid treated animals. The data were 79.6 and 80.3 g and 7.30 and 7.34 kg, respectively, for the experiment with virginiamycin. No significant interaction between anabolics and antibiotics was obtained with respect to gain and feed efficiency. Dressing percentage, carcass composition, carcass grading and meat traits were not affected by anabolic treatment or antibiotic supplementation.
用32头和39头比利时白红牛进行了两项试验，这些牛在屠宰前55至60天期间用合成代谢剂处理。将外源性雄激素和雌激素与孕酮（实验I）一起或不与孕酮（实验II）每隔三周注射一次。日粮由玉米青贮料和每千克活重每天7.5克精料组成。每个实验中的一半动物在约285天的整个育肥期内接受抗生素。在实验I中，每千克精料添加65毫克的拉沙洛西钠，在实验II中添加维吉尼亚霉素。合成代谢剂分别将平均日增重从1.06千克提高到1.20千克（P<0.10）和从1.24千克提高到1.42千克（P<0.05）。在两项试验中，甾体生长促进剂均刺激了采食量并提高了饲料效率（P<0.10）。在这个短期育肥期内，饲料抗生素对日增重没有显著影响。观察到拉沙洛西钠组采食量减少（P<0.05）且饲料转化率提高，而维吉尼亚霉素组则无差异。对照组和拉沙洛西钠处理组动物的干物质摄入量分别为每千克代谢体重80.5克和76.3克，每千克增重分别为9.02千克和8.41千克。在使用维吉尼亚霉素的实验中，数据分别为79.6克和80.3克以及7.30千克和7.34千克。在增重和饲料效率方面，合成代谢剂与抗生素之间未获得显著相互作用。屠宰率、胴体组成、胴体分级和肉质不受合成代谢处理或抗生素添加的影响。
