Study And Optimization Of Stocked Ewe Production System Of Northeast Fine Sheep In Agro-pastoral Ecotone

A great number of sheep were fed in China Northeast Agro-pastoral Ecotone, which played an important role in the economy of the region. In the passed several decades, we did not concern about the livestock population age structure, especially the stocked ewe population age structure.Field investigation and experiments were conducted to research the realistic stocked ewe population age structure and productivity performance of stocked ewe. Demography and linear programming way were conducted to optimize the age structure of stocked ewe population. In finally we could find the distinctions that between optimized stocked ewe age structure and the reality's, and got the conclusions that the it was need to optimize the stocked ewe population age structure. Most of all, this thesis came up with the optimal stocked ewe population age structure and the relative off-take strategies, as follows:I . Attending the maximum total LW(liveweight) output, the optimal stocked ewe population age structure and relative off-take strategy as follows: P₁=P₂=46.1%, P₃=P₄=3.9%; R₁=0. R₂=0.92, R₃=0 R₄=1 R=0.46;II. Attending the maximum total W(wool) output, the optimal stocked ewe population agestructure and relative off-take strategy as follows: P₁=P₂=P₃=P4=P5=20%; R₁=R₂=R₃=R₄=0 R₅=1 R=0. 2;III. Attending the maximum total LR(lambing rate), the optimal stocked ewe populationage structure and relative off-take strategy as follows: P₁=P₂=P₃=P₄=P₅=P₆=16.7%; R₁=R₂=R₃=R₄=R₅=0 R₆=1 R=0.167;IV. Attending the maximum multi-product output, the optimal stocked ewe population agestructure and relative off-take strategy as follows:P₁=P₂=46. 1%, P₃=P4=3.9%; R₁=0 R₂=0.92 R₃=0 R₄=1 R=0. 46;...