Lifetime reproductive and financial performance of female swine.

摘要

Reproductive and financial performance of female pigs was evaluated in 25 herds. Lifetime reproductive productivity was summarized as number of pigs weaned per herd day per mated female and as number of herd days per pig weaned per mated female. Factors associated with these 2 measures were determined using linear regression. Financial data from a commercial database were used to estimate maximum number of parities at removal associated with profitability. Sensitivity analysis was used to simulatehow variations in daily maintenance cost and value per weaned pig would influence profitability. Mean number of pigs weaned per herd day per mated female was 0.054; mean number of herd days per pig weaned per mated female was 20.2. Both these measures were associated with proportion of non-productive days during herd life, preweaning mortality rate per litter weaned, mean lifetime number of pigs born alive per litter weaned, and mean lifetime lactation duration. Maximum parity at time of removal associated with profitability ranged from 5 to 8. Daily maintenance costs per female had a greater impact on lifetime profitability than did value per weaned pig. It is suggested that lifetime reproductive and financial performance is optimized among pig herdsthat have higher proportions of high-parity females.