Herd

Value flow,livestock structure,optimal-control management and sustainable development of ecological economic system in alpine meadow;

高寒草地生态经济系统价值流、畜群结构、最优控制管理及可持续发展

Further analysis showed that herd offtake rate is related with livestock offtake age and female reproduction rate.

建立了畜群结构满足的方程组,通过解方程组得到畜群结构与畜群出栏率,进一步分析得出畜群出栏率与出栏畜龄P和母畜产羔率r有关。