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KMID : 1025520070490040451
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Journal of Animal Science and Technology
2007 Volume.49 No. 4 p.451 ~ p.458
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Effect of Administration of Gonadotropin and Scheduled Fixed-time Insemination on Onset of Estrus and Reproductive Performance in Lactating Sows
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Ryu Jae-Weon
Cho Kyu-Ho
Son Jung-Ho
Kim Youn-Su
Chung Ki-Hwa
Kim In-Cheul
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Abstract
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This study was to investigate the effectiveness of pre-weaning injection of gonadotropin and scheduled fixed-time insemination on sow fertility. Sows were randomly assigned to receive gonadotropin 2 days before weaning, 1 day after weaning or none as control.
In gonadotropin treated groups, half of sows were inseminated twice at 24 and 36 hours after onset estrus and half of sows were inseminated twice at scheduled fixed-time. Weaning to onset of estrus was the shortest in lactating sows injected with gonadotropin prior to weaning. Liter size was significantly higher in AI groups after detection of estrus, compared to fixed-time AI group.
Results of these experiments indicated that injection of gonadotropin in lactating sows could initiate the final follicular development, and has potential to enhance the reintegration of estrus. Further researches are needed to define the relationship between reduced interval of wean to onset estrus and enhanced fertility in lactating sows.
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KEYWORD
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Synchronization of estrus, Gonadotropin, Sows, Fixed-time AI
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