Department of Animal Sciences, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 7712, Porto Alegre, RS, Brazil, 91540-000.
Department of Preventive Veterinary Medicine, Av. Bento Gonçalves, 8834, Porto Alegre, RS, Brazil, 91540-000.
Poult Sci. 2018 Jan 1;97(1):124-130. doi: 10.3382/ps/pex269.
A study was conducted to determine the AMEn contents of fat by-products from the soybean oil industry for broiler chickens. A total of 390 slow-feathering Cobb × Cobb 500 male broilers were randomly distributed into 13 treatments having 6 replicates of 5 birds each. Birds were fed a common starter diet from placement to 21 d. Experimental corn-soy diets were composed of four fat sources, added at 3 increasing levels each, and were fed from 21 to 28 d. Fat sources utilized were acidulated soybean soapstock (ASS), glycerol (GLY), lecithin (LEC), and a mixture (MIX) containing 85% ASS, 10% GLY and 5% LEC. A 4 × 3 + 1 factorial arrangement was used with 4 by-products (ASS, GLY, LEC, or MIX), 3 inclusion levels and 1 basal diet. Each of the four fat by-product sources was included in the diets as follow: 2% of by-products (98% basal + 2% by-product), 4% (96% basal + 4% by-product), or 6% (94% basal + 6% by-product). Birds were submitted to 94, 96, 98, and 100% of ad libitum feed intake; therefore, the differences in AMEn consumption were only due to the added by-product. Total excreta were collected twice daily for 72 h to determine apparent metabolizable energy contents starting at 25 d. The AMEn intake was regressed against feed intake and the slope was used to estimate AMEn values for each fat source. Linear regression equations (P < 0.05) estimated for each by-product were as follow: 7,153X - 451.9 for ASS; 3,916X - 68.2 for GLY; 7,051X - 448.3 for LEC, and 8,515X - 622.3 for MIX. Values of AMEn were 7,153, 3,916, 7,051, and 8,515 kcal/kg DM for ASS, GLY, LEC, and MIX, respectively. The present study generated AMEn for fat by-products data that can be used in poultry feed formulation. It also provides indications that, by adding the 3 by-products in the proportions present in the MIX, considerable economic advantage can be attained.
一项研究旨在确定大豆油工业中脂肪副产品的肉鸡代谢能值。总共 390 只慢羽考伯×考伯 500 只雄性肉鸡被随机分配到 13 个处理组中，每组 6 个重复，每个重复 5 只鸡。鸡从放置到 21 天的时间里，只喂普通的起始饲料。实验玉米-大豆饲料由四种脂肪来源组成，每个来源添加三个递增水平，从 21 天到 28 天。利用的脂肪来源是酸化的大豆皂脚（ASS）、甘油（GLY）、卵磷脂（LEC）和一种含有 85% ASS、10% GLY 和 5% LEC 的混合物（MIX）。采用 4 × 3 + 1 因子设计，有 4 种副产品（ASS、GLY、LEC 或 MIX）、3 个添加水平和 1 个基础日粮。四种脂肪副产品来源中的每一种都以以下方式添加到日粮中：2%的副产品（98%基础+2%副产品）、4%（96%基础+4%副产品）或 6%（94%基础+6%副产品）。鸡的饲料摄入量为自由采食量的 94%、96%、98%和 100%；因此，代谢能的消耗差异仅归因于添加的副产品。从 25 天开始，每天两次收集 72 小时的总排泄物，以确定表观代谢能含量。代谢能摄入量与采食量回归，斜率用于估计每种脂肪源的代谢能值。为每个副产品估计的线性回归方程（P < 0.05）如下：ASS 为 7,153X - 451.9；GLY 为 3,916X - 68.2；LEC 为 7,051X - 448.3；MIX 为 8,515X - 622.3。ASS、GLY、LEC 和 MIX 的代谢能值分别为 7,153、3,916、7,051 和 8,515 kcal/kg DM。本研究提供了可用于家禽饲料配方的脂肪副产品代谢能数据。它还表明，通过以 MIX 中存在的比例添加这三种副产品，可以获得可观的经济效益。
