Inadequate information about the long-term effects of grazing strategies on native grass production and animal growth poses limitations to sustainable management of beef cattle. A 20-year simulation study was conducted using the Sustainable Grazing Systems model to analyse implications of different stocking rates (SRs) and simple rotational grazing systems (SRGSs) for rangeland-based Brahman steers. Simulations included three SRGSs (two, three and four paddocks per herd) and four SRs that were compared for their effects on grass production, dry matter intake (DMI) and live weight gain (LWG). Stocking rates included a recommended SR of 10 ha livestock unit (LU)⁻¹, 30% high (7 ha LU⁻¹) and, 50% and 100% low (15 and 20 ha LU⁻¹), respectively, SR. Overall, there were no observable differences in the long-term response of grass production and DMI to all treatments for SRGS and SR. In addition, effects of SRGSs on animal production were almost similar across treatments in short and long timeframes, but differential responses of LWG to SRs were more pronounced regardless of time. These findings provide a useful criterion for choosing effective SRs to achieve sustained grass and animal production with lowest risk.

关于放牧策略对本地牧草生产和动物生长的长期影响的信息不足，限制了肉牛的可持续管理。使用可持续放牧系统模型进行了一项为期 20 年的模拟研究，以分析不同放养率 (SR) 和简单轮牧系统 (SRGS) 对基于牧场的婆罗门阉牛的影响。模拟包括三个 SRGS（每个牛群两个、三个和四个围场）和四个 SR，比较它们对草产量、干物质摄入量 (DMI) 和活体重增加 (LWG) 的影响。放养率包括 10 公顷牲畜单位 (LU) ^-1的推荐 SR 、30% 高（7 公顷 LU ^-1）和 50% 和 100% 低（15 和 20 公顷 LU ^-1)，分别为 SR。总体而言，草产量和 DMI 对 SRGS 和 SR 的所有处理的长期响应没有可观察到的差异。此外，SRGSs 对动物生产的影响在短期和长期的处理中几乎相似，但 LWG 对 SRs 的不同反应无论时间如何都更加明显。这些发现为选择有效的 SR 以实现最低风险的持续草和动物生产提供了有用的标准。