Federal University of Alagoas, Arapiraca Campus, Manoel Severino Barbosa Street, Bom Sucesso, Arapiraca, Alagoas 57309-005, Brazil.
Southwest Bahia State University, Primavera, Itapetinga, Bahia 45700-000, Brazil.
Animal. 2021 Feb;15(2):100088. doi: 10.1016/j.animal.2020.100088.
Crude glycerin (CG) is a biodiesel byproduct that has been tested as an alternative feed additive for use in beef production. After being absorbed, it is used in the liver to produce glucose, an important precursor of intramuscular fat in ruminants. This study aimed to evaluate the effect of CG (439 g/kg glycerol) on the performance and meat quality of crossbred heifers finished in Urochloa brizantha cv. Marandu. Thirty-six heifers with an initial BW of 301.5 ± 23.02 kg were used. They were supplemented for 154 days with the following levels of CG: mineral mixture (without CG), 33.3, 66.6 and 99.9 g/kg CG in the DM of the supplement. Supplement or pasture DM intakes, slaughter BW and carcass traits were not influenced (P > 0.05) by increasing levels of CG. The total fat content of the meat, the vaccenic (18:1 n-7t) and conjugated linoleic acid (18:2 c9-t11) increased with the addition of CG in the diet (P < 0.05). Crude glycerin can be included up to 99.9 g/kg of the total diet without changing the performance of crossbred heifers finished in the tropical pasture.
粗甘油（CG）是一种生物柴油的副产物，已被测试作为替代饲料添加剂用于牛肉生产。被吸收后，它在肝脏中用于产生葡萄糖，这是反刍动物肌肉内脂肪的重要前体。本研究旨在评估 CG（439g/kg 甘油）对在 Urochloa brizantha cv. Marandu 草地上育肥的杂交小母牛的性能和肉质的影响。使用了 36 头初始 BW 为 301.5±23.02kg 的小母牛。它们在 154 天内补充以下 CG 水平：矿物混合物（无 CG）、DM 中补充的 33.3、66.6 和 99.9g/kg CG。随着 CG 水平的增加，补充或牧场 DM 摄入量、屠宰 BW 和胴体性状不受影响（P＞0.05）。肉的总脂肪含量、瘤胃脂肪酸（18:1 n-7t）和共轭亚油酸（18:2 c9-t11）随着日粮中添加 CG 而增加（P＜0.05）。粗甘油可以添加到日粮的 99.9g/kg 以内，而不会改变在热带牧场育肥的杂交小母牛的性能。
