贵州高原人工草地绵羊畜群结构的研究

对试验和调查所取得的有关数据，应用系统分析方法，建立了一个绵羊种群动态模型，以描述绵羊的实际生产过程，并且采用线性规划模型，对贵州高原人工草地的放牧绵羊的种群结构进行了研究．结果表明，最佳畜群结构为母羔１３．８８％、育成母羊１７．０９％、成年母羊６１．７９％、公羔０．９８％、育成公羊１．１６％、成年公羊５．１０％．同时，最佳畜群结构的产值将比现行结构提高８．４％．

Sheep population structure on artificial pasture in Guizhou Plateau

The optimization model of sheep population structure was established based on the data of test on the spot and by systematic engineering method in this paper. First of all, the dynamic model of population was set up to describe the sexual and age structure. Then linear programme model was established to calculate the best structure and the plan of sale. Maximum output value as the objective function was chosen and the inhibitory factors of natural forage resources were considered annually and balanced population was acquired. The optimal structure was as follows: ewe lamb, gimmer hogg, adult ewes, ram lamb, hogget, adult rams were 13.88%, 17.09%, 61.79%, 0.98%, 1.16% and 5.10% respectively. The economic effect would be increased by 8.4% if this programme was put into practice. 