O'Donovan P B, Woldegebriel A, Taylor M S, Gebrewolde A
Trop Anim Health Prod. 1978 Nov;10(4):243-9. doi: 10.1007/BF02235353.
Two experiments are described involving 33 crossbred (mainly Simmental and Jersey X Zebu) and 33 Zebu (Horro and Boran) bulls and steers. In experiment I, growth rates of crossbred and Zebu cattle rotationally grazed on either native pasture or Rhodes grass (Chloris gayana) were compared during a 140 day grazing period at a stocking rate of 2.4 animals/ha. In experiment II, growth rate of cattle rotationally grazed for 140 days on native pasture was compared with that of a similar group grazed on Rhodes grass either rotationally or continuously at a stocking rate of seven animals/ha. On native pasture the average daily gain by Zebu animals was similar to that of the crossbreds whilst on Rhodes grass liveweight gain of Zebu animals was lower than that of the crossbreds. Daily gains of cattle were significantly (P less than 0.01) greater on continuous compared with rotationally grazed Rhodes grass.
描述了两项实验，涉及33头杂交牛（主要是西门塔尔牛以及泽西牛与瘤牛的杂交种）和33头瘤牛（霍罗牛和博拉纳牛）公牛及阉牛。在实验I中，比较了在天然牧场或罗得草（Chloris gayana）上轮牧的杂交牛和瘤牛的生长率，放牧期为140天，载畜率为2.4头/公顷。在实验II中，将在天然牧场上轮牧140天的牛的生长率与以7头/公顷的载畜率在罗得草上轮牧或连续放牧的类似牛群的生长率进行了比较。在天然牧场上，瘤牛的平均日增重与杂交牛相似，而在罗得草上，瘤牛的体重增加低于杂交牛。与在罗得草上轮牧相比，连续放牧的牛的日增重显著更高（P小于0.01）。
