Sales J, Janssens G P J
Laboratory of Animal Nutrition, Department of Animal Nutrition, Genetics, Breeding and Ethology, Faculty of Veterinary Medicine, Ghent University, Heidestraat 19, B-9820, Merelbeke, Belgium.
Poult Sci. 2003 Sep;82(9):1457-61. doi: 10.1093/ps/82.9.1457.
The influence of length of excreta collection period (1, 3, 6, 10, 14 d) and prefeeding protocol (7 d either individual feeding in collection cages or group feeding in housing cages) on AMEn, nitrogen retention (NR), and apparent DM, organic matter and ether extract digestibility of corn and peas were evaluated in domestic pigeons (Columba livia domestica). In addition, the use of internal markers [acid-insoluble ash (AIA) and acid detergent lignin (ADL)] to determine AMEn, NR, and apparent digestibility was compared with the method of measuring total feed input and excreta output. A quadratic (y = a + bx + cx2) trend in the CV for AMEn, NR, and apparent digestibility coefficients found over collection periods with corn presented evidence that excreta collection for a period of 3 d will produce a CV of 5% less than the minimum CV. Although no trend could be detected in CV for peas, a 3-d excreta collection period resulted in relatively low variation. Both AIA and ADL, when used as internal markers, resulted in AMEn, NR, and digestibility values below (P < 0.05) those obtained with total collection with corn. However, values between markers were comparable (P > 0.05) for all components evaluated. The ADL was unsuccessful as marker with peas. Group prefeeding of pigeons in housing cages resulted in lower feed intake, excreta output, NR, and apparent digestibility than when birds were adapted individually to collection cages. This study presents evidence that the method of measuring total feed intake and excreta output for a period of 3 d, with individual adaptation of birds to collection cages, resulted in the most reliable values for AMEn, NR, and apparent digestibility of DM, organic matter and ether extract of feed ingredients in pigeons.
在家鸽（Columba livia domestica）中，评估了排泄物收集期长度（1、3、6、10、14天）和预饲方案（在收集笼中单独饲养7天或在饲养笼中群体饲养7天）对玉米和豌豆的表观代谢能（AMEn）、氮保留（NR）以及表观干物质、有机物和乙醚提取物消化率的影响。此外，还比较了使用内源指示剂[酸不溶性灰分（AIA）和酸性洗涤木质素（ADL）]来测定AMEn、NR和表观消化率与测量总饲料摄入量和排泄物产量的方法。在玉米的收集期内，AMEn、NR和表观消化率系数的变异系数（CV）呈二次曲线趋势（y = a + bx + cx2），这表明收集3天的排泄物产生的CV比最小CV低5%。尽管豌豆的CV未检测到趋势，但3天的排泄物收集期导致变异相对较低。当使用AIA和ADL作为内源指示剂时，玉米的AMEn、NR和消化率值低于（P < 0.05）总收集法获得的值。然而，对于所有评估的成分，两种指示剂之间的值具有可比性（P > 0.05）。ADL作为豌豆的指示剂未成功。与将鸽子单独适应收集笼相比，在饲养笼中对鸽子进行群体预饲导致采食量、排泄物产量、NR和表观消化率较低。本研究表明，测量3天的总采食量和排泄物产量，并将鸽子单独适应收集笼的方法，能得出鸽子饲料成分中DM、有机物和乙醚提取物的AMEn、NR和表观消化率的最可靠值。
