Beede D K, Schelling G T, Mitchell G E, Tucker R E, Gill W W, Koenig S E, Lindsey T O
J Anim Sci. 1986 Mar;62(3):857-63. doi: 10.2527/jas1986.623857x.
Two digestion and metabolism experiments were conducted to determine effects of monensin in low-protein diets. Monensin supplementation (27 mg/kg of diet dry matter) of steers (303 kg) fed 8.7% crude protein increased (P less than .01) apparent N digestibility and N retention and decreased (P less than .01) percentage of N apparently absorbed lost in urine. Apparent digestibilities of dry matter, gross energy and acid detergent lignin were increased (P less than .05). Digestibilities of neutral detergent and acid detergent fibers were not affected by monensin. In growing wether goats (15 kg) fed 8.5% crude protein, monensin (23 mg/kg of diet dry matter) improved (P less than .01) apparent N digestibility and apparent N absorption. However, urinary N excretion also increased (P less than .05), resulting in no difference in N retention. Monensin did not affect digestibilities of dry matter or gross energy. Efficiency of feed conversion and average daily gain were improved with monensin supplementation of growing goats fed a low-protein, high-roughage diet. Monensin resulted in typical shift of acetate-to-propionate ratio in both experiments. Results suggest that improved N utilization may account for some benefits of feeding monensin.
进行了两项消化和代谢试验，以确定莫能菌素在低蛋白日粮中的作用。给体重303千克的阉牛饲喂粗蛋白含量为8.7%的日粮，并添加莫能菌素（27毫克/千克日粮干物质），可提高（P<0.01）表观氮消化率和氮保留率，并降低（P<0.01）尿中表观吸收氮的损失百分比。干物质、总能和酸性洗涤木质素的表观消化率提高（P<0.05）。中性洗涤纤维和酸性洗涤纤维的消化率不受莫能菌素影响。给体重15千克的生长阉羊饲喂粗蛋白含量为8.5%的日粮，并添加莫能菌素（23毫克/千克日粮干物质），可提高（P<0.01）表观氮消化率和表观氮吸收。然而，尿氮排泄也增加（P<0.05），导致氮保留率无差异。莫能菌素不影响干物质或总能的消化率。给饲喂低蛋白、高粗饲料日粮的生长山羊添加莫能菌素，可提高饲料转化率和平均日增重。在两项试验中，莫能菌素均导致乙酸与丙酸比例发生典型变化。结果表明，氮利用率提高可能是饲喂莫能菌素产生某些益处的原因。
