School of Veterinary Medicine and Animal Science, São Paulo State University, Botucatu, SP, Brazil.
Department of Animal Science, Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
Trop Anim Health Prod. 2023 Apr 5;55(3):143. doi: 10.1007/s11250-023-03573-9.
Molasses must be one of the most used foods in the diet of ruminant animals; however, there is no consensus on the effect of including molasses on carcass parameters. In this context, the objective was to evaluate the effect of including molasses in the diet of feedlot cattle on performance and carcass parameters. Thirteen peer-reviewed publications with 45 treatment means were included in the dataset. The effect of molasses in beef cattle diets was evaluated by examining the weighted mean differences (WMD) between molasses treatment (diet with molasses) and control diet (diet without molasses). Heterogeneity was explored by meta-regression and subgroup analysis using genetic type and experimental period, molasses in diet (g/kg dry matter (DM)), molasses type, concentrate in diet (g/kg DM), and forage type. The inclusion of molasses in the diet increased dry matter digestibility, but reduced NDF digestibility, carcass weight, subcutaneous, and visceral fat. The main sources of variation for the responses with molasses inclusion on intake, digestibility, performance, and carcass parameters were the level of molasses inclusion and the experimental period. In general context, the inclusion of molasses in the diet between 100 to 150 g/kg of DM did not affect performance and carcass parameters. However, the inclusion of molasses above 200 g/kg reduces the average daily gain and carcass weight.
糖蜜一定是反刍动物饮食中使用最多的食物之一；然而，在包括糖蜜对胴体参数的影响方面，尚未达成共识。在这种情况下，本研究的目的是评估在育肥牛日粮中添加糖蜜对生产性能和胴体参数的影响。该数据集包含了 13 篇经过同行评审的出版物，其中有 45 个处理方法。通过检查糖蜜处理（含糖蜜的日粮）与对照日粮（不含糖蜜的日粮）之间的加权平均差异（WMD），评估了糖蜜对肉牛日粮的影响。使用遗传类型和实验周期、日粮中糖蜜含量（g/kg 干物质（DM））、糖蜜类型、日粮精料含量（g/kg DM）和饲草类型进行了 meta 回归和亚组分析，以探索异质性。日粮中添加糖蜜增加了干物质消化率，但降低了中性洗涤纤维消化率、胴体重、皮下和内脏脂肪。对摄入、消化率、性能和胴体参数有影响的添加糖蜜的主要变化来源是糖蜜添加量和实验周期。一般来说，日粮中添加 100-150g/kg DM 的糖蜜不会影响生产性能和胴体参数。然而，添加超过 200g/kg 的糖蜜会降低平均日增重和胴体重。
