Sequential grazing by several livestock species has potential benefits in biodiversity conservation, resource use efficiency, animal productivity and profitability. Our objective was to assess diet composition and nutritional quality for alpacas and sheep in mono grazing and sequential grazing of either species after cattle, on puna tussock rangelands in Peru. Four experimental plots in each of two blocks were randomly assigned to one of four treatments: mono grazing by sheep, mono grazing by alpaca, sequential grazing of cattle followed by sheep, and sequential grazing of cattle followed by alpaca. Simulated diet (hand plucked that mimicked the animal´s foraging) and vegetation samples were collected in the wet and dry seasons. The botanical composition was determined by a macroscopy point technique, diet selection by the Ivlev´s elective index, and diet nutritional quality by routine forage analyses (digestibility, crude protein, and neutral detergent fiber). Both the alpacas and sheep selected less tall tussock grasses and more forbs in the sequential grazing than in mono grazing in both the wet and dry seasons, and more leaf and green biomass in sequential grazing than mono grazing in the dry season. This grazing behavior was reflected in greater avoidance of the tall grasses and higher preference for leaf and green biomass in the sequential grazing than in mono grazing. The differences in diet selection between the different grazing managements resulted in a diet higher in crude protein in sequential grazing than in mono grazing. Sequential grazing of cattle followed by either alpacas or sheep modified the diet selection of the two latter species, improving the nutritional quality of the diet.

几种牲畜物种的顺序放牧对生物多样性保护，资源利用效率，动物生产力和盈利能力具有潜在的好处。我们的目标是评估在秘鲁的金枪鱼草丛牧场上，无论是单种放牧还是继牛放牧后的任一种物种，羊驼和绵羊的饮食组成和营养质量。在两个区块的每一个中的四个实验地块被随机分配到以下四个处理之一：绵羊单头放牧，羊驼单头放牧，先牛后羊的先后放牧，以及牛先后羊驼的先后放牧。模拟饮食（采摘后模仿动物的觅食），在潮湿和干燥的季节收集了植被样本。植物组成是通过宏观点技术确定的，饮食选择是通过Ivlev的选修指标确定的，日常饲草分析（可消化性，粗蛋白和中性清洁剂纤维）的营养和饮食营养质量。与湿季和旱季相比，连续放牧中的羊驼和绵羊选择的草丛不多，草丛较多，而不是单草放牧，而在旱季，连续牧草选择的叶和绿色生物量更多。与连续放牧相比，这种放牧行为更多地避免了高高的草丛，对叶和绿色生物量的偏好更高。不同放牧管理之间饮食选择的差异导致连续放牧的日粮中粗蛋白含量高于单一放牧的日粮。依次放牧牛，然后是羊驼或绵羊，改变了后两种的饮食选择，