肉牛生産のシステム解析

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タイトル別名
  • A Systems Analysis on Beef Cattle Production
  • ニクギュウ セイサン ノ システム カイセキ

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This study was mode for decision making in beef cattle management to evaluate the production systems. The systems model of beef cattle production was designed to investigate the effect of management decisions on the beef productivity, the labor consumption and the production cost. By using the model composed of mathematical equations, the following results were obtained:<br>1. The simulation resuets were well coincided with the results from experiment.<br>2. The maximum number of feedable cows in 62ha and 80ha of pasture was shown in Table 5.<br>3. The produced amount of beef cattle was illustrated in Fig. 9.<br>4. The labor consumption was shown in Fig. 10.<br>5. The production cost per produced cattle was indicated in Fig. 11.<br>6. The pasture usage policy (C) gave less consumption of labor.<br>7. The low production cost per produced cattle was given when the pasture usage was (B) or (C).<br>8. The optimal policy for the management and the pasture usage was (B) (B).<br>Where: Management (A)=selling all calves at once in autumn<br>Management (B)=selling heifer calves in autumn and bullocks in next spring after fattening<br>Pasture usage (A)=using pasture divided into three of grazing land, grassland and dual purpose land in the proportion of 44.4%, 36.1% to 19.5%<br>Pasture usage (B)=using pasture divided in the proportion of 50.0%, 36.1% to 13.9%<br>Pasture usage (C)=using pasture divided in the proportion of 50.0%, 30.0% to 20.0%

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