繁殖能力を中心とした母豚更新期の決定に関する事例的検討

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タイトル別名
  • A Case Study on the Optimum Breeding Age of a Sow Keeping.
  • 繁殖能力を中心として母豚更新期の決定に関する事例的検討
  • ハンショク ノウリョク オ チュウシン ト シタ ハハブタ コウシンキ ノ ケ

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Reproductive records for an average number of pigs born alive (NBA) on 18, 217 litters of 4, 390 sows (Landrace (L)×Large White (W) and W×L) raised in 54 farms from 1987 to 1991 and production costs data obtained from 1992 to 1993 in the samefarms were analyzed to find the parity showing the maximum average profit, which indicates the optimum keeping period of a sow.<br>The average profit up to kth parity was calculated by the following function; the average profit up to kth parity=(the total NBA up to kth parity×marketing rate of pigs×selling profit per pig-the total costs of feed and management up to kth parity-the total cost of mating up to kth parity-purchase cost of a sow and its raising cost+price of a culled sow)/κ.<br>The average profits calculated using the average NBA on each parity showed the maximum value at the ninth parity. The average profits calculated by the NBA increasing 10 per cent than the average NBA showed the maximum value at eighth parity, and the average profits calculated by the NBA decreasing of 10 per cent showed, the maximum value was at the ninth parity. In either case, the average profits showed the material increase until fifth parity, and showed the slight increase from sixth to tenth parities.<br>For easy caliculation of the maximum average profit and its parity, two numerical expressions were drawn by the method of multiple regression with eight variables of purchase cost of a sow, management cost, dressed carcass price, feed cost, price of a culled sow, NBA, purchase cost of a sire and keeping period of a sire. As a result, R2 for the maximum average profit and its parity were 0.99 and 0.85, respectively.

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