The objective of this experiment was to determine the effects of feeding varying levels of crude glycerine (CG) on dry matter intake (DMI), animal performance, carcass traits and rumen volatile fatty acids (VFA) concentration in meat goats. Twenty-four intact male Boer goats (23.9 ± 1.0 kg initial BW and 4–5 months of age) were randomly assigned to one of four experimental diets (n = 6) containing 30% bermudagrass hay plus 70% concentrate mix with 0, 5, 10 or 15% CG in the diet on an as-fed basis, substituted for the corn portion of the concentrate. Feed offered and refusals were monitored daily for 84 days. Goats were weighed at 28-days interval. Blood and rumen samples were collected on day 84. At the end of the 84-days feeding period, goats were harvested, and carcass characteristics measured. Feed intake, average daily gain (ADG), gain-to-feed ratio (G:F), carcass traits and VFA concentrations were analysed as a completely randomized design. The CG did not influence animal body weight (BW) changes, ADG and G:F ratio but tended to (p = 0.06) decrease DMI. Molar per cent propionic acid increased linearly (p < 0.05) with increasing CG. The acetate: propionate (A:P) ratio decreased (p < 0.05) with increasing amounts of CG in the diet. The CG addition tended to increase (p = 0.09) the longissimus muscle (LM area) in meat goats. In conclusion, CG can replace corn in diet for growing meat goats when fed up to 15% of diet, improving ruminal propionate concentration, but decreasing A:P ratio without affecting animal performance and carcass traits.

中文翻译：

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用粗甘油补充肉山羊饮食：瘤胃发酵代谢、血液化学特征、动物性能和胴体特征

本实验的目的是确定饲喂不同水平的粗甘油 (CG) 对肉山羊的干物质摄入量 (DMI)、动物性能、胴体性状和瘤胃挥发性脂肪酸 (VFA) 浓度的影响。24 只完整的雄性波尔山羊（23.9 ± 1.0 kg 初始体重和 4-5 个月大）被随机分配到四种实验饮食中的一种（n = 6），其中含有 30% 百慕大干草和 70% 的浓缩混合物和 0, 5 , 10% 或 15% CG 在饲料中添加，替代浓缩物中的玉米部分。每天监测提供和拒绝的饲料，持续 84 天。山羊每隔 28 天称重一次。在第 84 天收集血液和瘤胃样本。在 84 天饲养期结束时，收获山羊并测量胴体特征。采食量，平均日增重（ADG），以完全随机的设计对增重饲料比 (G:F)、胴体性状和 VFA 浓度进行分析。CG 不影响动物体重 (BW) 变化、ADG 和 G:F 比，但倾向于（p  = 0.06) 降低 DMI。 随着 CG 的增加，丙酸的摩尔百分比线性增加 ( p < 0.05)。 随着饮食中 CG 量的增加，乙酸盐：丙酸盐 (A:P) 比率降低 ( p < 0.05)。添加 CG 倾向于增加 ( p  = 0.09) 肉山羊的最长肌 (LM 区域)。总之，当饲喂至多 15% 的日粮时，CG 可以代替玉米用于生长肉山羊，提高瘤胃丙酸浓度，但降低 A:P 比而不影响动物性能和胴体性状。