Factors Associated with Sows Having Low Lifetime Efficiency in Commercial Herds

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  • 繁殖農場における低生涯生産性を示す母豚に関連する要因

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Abstract

The objective of the present study was to investigate factors associated with the risk of female pigs (females) becoming low lifetime efficiency sows (LE sows) in commercial herds. The factors investigated were age of gilts at first mating (AFM), number of services in parity 0 and pigs born alive (PBA) in parity 1. Farrowing records were obtained for 34,728 gilts entered into 101 commercial herds from 2001 to 2003. LE sows were defined as sows having lower 25th percentile of annualized lifetime PBA. AFM was categorized into six 21-day interval groups: 151-209, 210-230, 231-251, 252-272, 273-293 or 294-365 days. The PBA in parity 1 consisted of three groups: ≤ 7, 8-11 or ≥ 12 pigs. The number of services in parity 0 was categorized into two groups: non-returned to service or reserviced. Mixed-effects models were performed for statistical analyses. As AFM increased from the 151-209 to the 294-365 days, the proportions of females becoming LE sows correspondingly increase from 18.7 to 37.3% (P<0.05). The proportion of females becoming LE sows was 10.3% higher for reserviced gilts than for non-returned gilts (P<0.05). Sows with PBA ≤ 7 pigs in parity 1 had 19.4 and 28.5% higher proportions of females becoming LE sows than those with PBA 8-11 and ≥ 12 pigs in parity 1, respectively (P<0.05). In conclusion, in order to reduce the proportion of females becoming LE sows we recommend mating matured gilts at a lower age, reducing the percentage of reserviced gilts and increasing PBA in parity 1.

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