Carvalho V V, Paulino M F, Detmann E, Chizzotti M L, Martins L S, Silva A G, Lopes S A, Moura F H
Animal Science Department, Universidade Federal de Viçosa, Viçosa, MG, 36570-000, Brazil.
Trop Anim Health Prod. 2017 Jun;49(5):983-988. doi: 10.1007/s11250-017-1286-8. Epub 2017 Apr 7.
A grazing trial was carried out to evaluate the inclusion of three feed additives in supplements (crude protein, CP 230 g/kg dry matter, DM) on the performance, voluntary intake, and digestibility of beef heifers grazing Brachiaria decumbens (CP 81 and neutral detergent fiber, NDF 615 g/kg DM). Thirty-five Nellore heifers (21 months of age and 383 ± 6.29 kg of body weight, BW) were used in a completely randomized design. The treatments were as follows: no supplement (control); supplement fed at 1 kg/animal/day without additives (S); supplement with monensin (S + M); supplement with yeast culture (S + YC); and supplement with enzyme complex (S + EC). All of the supplemented heifers had greater (P < 0.1) average daily gain (∼0.186 kg/day) compared to the control treatment (0.014 kg/day). Average daily gain and final BW were similar (P > 0.1) among supplemented heifers. Monensin inclusion in the supplement decreased (P < 0.1) forage DM (expressed as g/kg BW) and NDF intake (expressed as kg/day and as g/kg BW). All of the feed additive inclusions decreased (P < 0.1) NDF digestibility. In conclusion, the heifers' performance was improved by concentrate supplementation. However, the inclusion of additives did not enhance this effect.
进行了一项放牧试验，以评估在补充料（粗蛋白，CP 230 g/kg干物质，DM）中添加三种饲料添加剂对放牧俯仰臂形草（CP 81，中性洗涤纤维，NDF 615 g/kg DM）的小母牛的生产性能、自愿采食量和消化率的影响。采用完全随机设计，使用了35头内罗尔小母牛（21月龄，体重383±6.29 kg，BW）。处理如下：不补充（对照）；每头动物每天饲喂1 kg无添加剂的补充料（S）；补充莫能菌素的补充料（S+M）；补充酵母培养物的补充料（S+YC）；补充复合酶的补充料（S+EC）。与对照处理（0.014 kg/天）相比，所有补充了补充料的小母牛平均日增重更高（P<0.1）（约0.186 kg/天）。补充了补充料的小母牛之间平均日增重和最终体重相似（P>0.1）。补充料中添加莫能菌素降低了（P<0.1）牧草干物质采食量（以g/kg体重表示）和NDF采食量（以kg/天和g/kg体重表示）。所有饲料添加剂的添加均降低了（P<0.1）NDF消化率。总之，补充精料提高了小母牛的生产性能。然而，添加添加剂并没有增强这种效果。
