USDA-ARS, U.S. Meat Animal Research Center, Clay Center, NE 68933, USA.
J Anim Sci. 2013 Aug;91(8):3875-80. doi: 10.2527/jas.2012-5944. Epub 2013 May 8.
Crude glycerin is a by-product of biodiesel production and has recently become more available as a livestock feed with the growth of the biofuel industry. Two experiments were conducted to evaluate the use of crude glycerin (GLY) as a feed ingredient in steam-flaked corn (SFC)-based growing diets fed to beef cattle. In Exp. 1, crossbred steers (n = 50; initial BW = 282 ± 2 kg) were used to determine the effects of GLY when included at 0, 2.5, 5, 7.5, and 10% of DM in a growing diet on cattle performance. In Exp. 2, crossbred steers (n = 54; initial BW = 283 ± 1 kg) were used to determine the effects of replacing SFC (REPSFC) or alfalfa hay (REPAH) with 7.5% GLY or a control diet without GLY (CON) on growing steer performance. In Exp. 1, final BW tended to respond in a quadratic manner (P = 0.09) in which it increased from 0 to 7.5% GLY and decreased from 7.5 to 10% GLY. Dry matter intake did not differ (P > 0.23), yet ADG responded quadratically (P = 0.04), where it increased from 0 to 7.5% GLY and decreased from 7.5 to 10% GLY. Feed efficiency (G:F) decreased linearly (P = 0.05) with increasing GLY concentration. In Exp. 2, final BW was greater for steers fed REPAH than CON or REPSFC (P = 0.04). Steers fed REPAH had a greater ADG than CON or REPSFC (P = 0.04). When GLY replaced SFC, ADG increased from 0 to 7.5% GLY where it was maximized before decreasing from 7.5 to 10% GLY inclusion. Replacing 7.5% of alfalfa hay (AH) in a growing diet with GLY can be beneficial to animal performance, which is likely the result of GLY being greater in energy than AH.
粗甘油是生物柴油生产的副产品，随着生物燃料工业的发展，它作为一种牲畜饲料越来越多。进行了两项实验，以评估在蒸汽压片玉米（SFC）基础的生长日粮中使用粗甘油（GLY）作为饲料成分喂养肉牛的效果。在实验 1 中，使用杂交阉牛（n = 50；初始体重 = 282 ± 2 kg）确定了生长日粮中包含 0、2.5、5、7.5 和 10%DM 的 GLY 对牛的生长性能的影响。在实验 2 中，使用杂交阉牛（n = 54；初始体重 = 283 ± 1 kg）确定了用 7.5%GLY 替代 SFC（REPSFC）或苜蓿干草（REPAH）或不添加 GLY 的对照日粮（CON）对生长阉牛生长性能的影响。在实验 1 中，最终体重呈二次趋势（P = 0.09），从 0 到 7.5%GLY 增加，从 7.5%GLY 到 10%GLY 减少。干物质采食量没有差异（P > 0.23），但 ADG 呈二次变化（P = 0.04），从 0 到 7.5%GLY 增加，从 7.5%GLY 到 10%GLY 减少。饲料效率（G：F）随 GLY 浓度的增加呈线性下降（P = 0.05）。在实验 2 中，与 CON 或 REPSFC 相比，喂饲 REPAH 的牛的最终体重更大（P = 0.04）。与 CON 或 REPSFC 相比，喂饲 REPAH 的牛的 ADG 更大（P = 0.04）。当 SFC 被 GLY 取代时，ADG 从 0 到 7.5%GLY 增加，在 7.5%GLY 包含量达到最大值，然后从 7.5%GLY 减少到 10%GLY 包含量。用 GLY 替代生长日粮中的 7.5%苜蓿干草（AH）可以对动物性能有益，这可能是 GLY 的能量含量高于 AH 的结果。
