Latshaw J D, Freeland K
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA.
Poult Sci. 2008 Jan;87(1):101-3. doi: 10.3382/ps.2007-00127.
Mature White Leghorn roosters that were intact or cecectomized were used to determine the ME of a diet. Seven intact and 7 cecectomized roosters were fasted for 3 d, with total excreta collection on d 2 and 3. Approximately 1 wk after completion of the trial, the same roosters were force-fed 28 g of a diet that was 85% corn and 15% soybean meal after a 1-d fast. Excreta were collected from d 2 and 3 and dried. There was no difference in the energy and nitrogen excreted by intact and cecectomized roosters when they were fasted for 3 d. The energy and nitrogen excreted by cecectomized roosters were greater than by intact roosters when they were fed the test diet. As a result, the AME, TME, AME(n), and TME(n) were all larger from intact roosters than from cecectomized roosters. Our results suggest that intact roosters should be used to determine the energy content of ingredients that will be fed to commercial flocks.
使用未阉割或已切除盲肠的成年白来航公鸡来测定日粮的代谢能。7只未阉割和7只已切除盲肠的公鸡禁食3天，在第2天和第3天收集全部排泄物。试验结束后约1周，相同的公鸡在禁食1天后强制饲喂28克由85%玉米和15%豆粕组成的日粮。在第2天和第3天收集排泄物并干燥。未阉割和已切除盲肠的公鸡禁食3天时，其排出的能量和氮没有差异。已切除盲肠的公鸡在饲喂试验日粮时排出的能量和氮比未阉割的公鸡多。因此，未阉割公鸡的AME、TME、AME(n)和TME(n)均比已切除盲肠的公鸡大。我们的结果表明，应使用未阉割公鸡来测定将饲喂给商业鸡群的饲料原料的能量含量。
