The selectivity index for height layer varies with seasons and stockingrate.
各高度草层的选择性随季节推移和放牧率不同而发生变化。
2
Brazilian cattle-ranching, which occupies 209m hectares, is staggeringly unproductive, with an average stockingrate of less than a head of cattle per hectare.
巴西养牛业占据了2.09亿公顷的土地，却相当低效，平均每公顷上放养还不到一头。
3
The selectivity index of different plant species changes with grazing The selectivity index of different plant species changes with grazing seasons and stockingrate.