Echevarria M G, Reyes C, Clavo N, Rodriguez J, Valdivia R, McDowell L R
IVITA Universidad Nacional Mayor de San Marcos, Pucallpa, Peru.
Trop Anim Health Prod. 1987 Aug;19(3):143-6. doi: 10.1007/BF02239708.
Twenty-four yearling 11-month old Nellore steers initially weighing 180 kg were assigned to three treatments in a randomised complete block experiment lasting 392 days. Animals grazed continuously either Yaragua grass (Hyparrhenia rufa) or Yaragua/Stylo legume (Stylosanthes guianensis) and received the following treatments: A) Control, Yaragua plus common salt, B) Yaragua/Stylo plus common salt, and C) Yaragua/Stylo plus dicalcium phosphate/common salt (1:1). Mineral consumption in the three groups averaged 52 g per animal day-1. At 13 months daily liveweight gains/steer were 0.182, 0.409 and 0.483 kg for treatments of Yaragua, Yaragua/Stylo, and Yaragua/Stylo plus dicalcium phosphate/common salt mixture. Daily liveweight gains per ha were 0.488, 1.289, and 1.522 kg steer-1 for Yaragua, Yaragua/Stylo plus common salt and Yaragua/Stylo plus dicalcium phosphate/common salt. Steers receiving a legume (stylo) in the diet more than doubled weight gains (P less than 0.05) compared to controls with dicalcium phosphate further (P less than 0.05) increasing these gains.
24头11月龄、初始体重180千克的内洛尔一岁公牛被分配到一项持续392天的随机完全区组试验的三种处理中。动物持续放牧亚拉瓜草（红苞茅）或亚拉瓜草/柱花草豆科植物（圭亚那柱花草），并接受以下处理：A）对照，亚拉瓜草加食盐；B）亚拉瓜草/柱花草加食盐；C）亚拉瓜草/柱花草加磷酸二钙/食盐（1:1）。三组的矿物质摄入量平均为每头动物每天52克。在13个月时，亚拉瓜草处理组、亚拉瓜草/柱花草处理组和亚拉瓜草/柱花草加磷酸二钙/食盐混合物处理组的每头公牛日增重分别为0.182、0.409和0.483千克。每公顷的日增重分别为：亚拉瓜草处理组0.488千克/头、亚拉瓜草/柱花草加食盐处理组1.289千克/头、亚拉瓜草/柱花草加磷酸二钙/食盐处理组1.522千克/头。与对照组相比，日粮中添加豆科植物（柱花草）的公牛增重增加了一倍多（P<0.05），添加磷酸二钙后增重进一步增加（P<0.05）。
