A Comparison between Artificial Insemination and Natural Mating for Reproductive Performance in Commercial Swine Herds

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  • 国内生産農場における人工授精と自然交配による繁殖成績の比較

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The objective of the present study was to compare reproductive performance of female pigs between three groups of service techniques in commercial swine herds. The data for female level analysis were obtained from 87 herds where both artificial insemination (AI) and natural mating (NM) were practiced. The study data included 27,034 service records and 22,063 farrowing records in 24,192 gilts, and 100,813 service records and 85,498 farrowing records in 35,630 sows. A service included multiple AI or NM during an estrus period. Serviced females were categorized into three service technique groups : ‘AI only,’ ‘NM only’ or ‘AI combined with NM (CM).’ Mixed-effects models were used to compare farrowing percentage and pigs born alive between the three service technique groups. Relative frequencies (%) of ‘AI only,’ ‘NM only’ and CM in 127,847 service records were 53.8, 8.6 and 37.6%, respectively. In both gilts and sows, no differences were found in farrowing percentages and pigs born alive between ‘NM only’and CM service technique groups. Gilts receiving ‘AI only’ had 5.9% lower farrowing percentages and 0.5 fewer pigs born alive than those receiving ‘NM only’ (P<0.05). Meanwhile, sows receiving ‘AI only’ had 2.2% lower farrowing percentages and 0.1 fewer pigs born alive than those receiving ‘NM only’ (P<0.05). In conclusion, AI techniques need to be improved in order to achieve optimal reproductive performance in both gilts and sows in commercial herds.

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