Bartov I
Department of Poultry Science, Volcani Center, Bet Dagan, Israel.
Poult Sci. 1987 Aug;66(8):1385-91. doi: 10.3382/ps.0661385.
The effects of dietary fat level, fat source, and protein level on the growth response of broiler chicks were evaluated in two experiments with a factorial design. A higher level of soybean oil (SO) (3.5 vs. .5%) in diets containing either 18.2 or 20.4% protein significantly (P less than .05) counteracted the depressing effect of monensin on feed intake and weight gain in male chicks in the first experiment. Dietary protein level did not significantly (P greater than .05) affect the response to monensin, nor did monensin affect feed to gain ratio. The higher SO level of 3.5% in diets containing 18.2% protein reduced, at times significantly (P less than .05), the depressing effect of monensin on feed and water intake, water to feed ratio, weight gain, and the retention of dry matter and nitrogen in female chicks in the second experiment. A similar higher level of tallow resulted in less pronounced effects on most of the parameters. Monensin supplementation did not affect dietary metabolizable energy content, but significantly (P less than .01) increased feed to gain ratio and the percent of fecal dry matter. It was concluded that the toxicity of monensin to chicks might be alleviated by increasing dietary unsaturated fat and protein levels.
在两项采用析因设计的试验中，评估了日粮脂肪水平、脂肪来源和蛋白质水平对肉仔鸡生长反应的影响。在第一个试验中，在蛋白质含量为18.2%或20.4%的日粮中，较高水平的大豆油（SO）（3.5%对0.5%）显著（P小于0.05）抵消了莫能菌素对雄性雏鸡采食量和体重增加的抑制作用。日粮蛋白质水平对莫能菌素的反应没有显著影响（P大于0.05），莫能菌素也不影响料重比。在第二个试验中，蛋白质含量为18.2%的日粮中3.5%的较高SO水平有时显著（P小于0.05）降低了莫能菌素对雌性雏鸡采食量和饮水量、水料比、体重增加以及干物质和氮保留的抑制作用。类似的较高水平的牛脂对大多数参数的影响不太明显。添加莫能菌素不影响日粮代谢能含量，但显著（P小于0.01）提高了料重比和粪便干物质百分比。得出的结论是，增加日粮不饱和脂肪和蛋白质水平可能会减轻莫能菌素对雏鸡的毒性。
