The Journal of Reproduction and Development Supplement
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The 100th Meeting of the Japanese Society of Animal Reproduction
Displaying 201-235 of 235 articles from this issue
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  • Expression analysis of parturition-related genes in placentome of bovine somatic cloned fetus
    Hiroki Hirayama, Ken Sawai, Akira Minamihashi, Satoru Moriyasu
    Session ID: P-88
    Published: 2007
    Released on J-STAGE: October 17, 2007
    DOIhttps://doi.org/10.14882/jrds.100.0.20088.0
    CONFERENCE PROCEEDINGS FREE ACCESS
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    [in Japanese]
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  • Effect of Administration of Gonadotropin on Onset of Estrus and Reproductive Performance in Lactating Sows
    K. H. Chung, I. C. Kim, J. W. Ryu, K. H. Cho, J. H. Son
    Session ID: P-89
    Published: 2007
    Released on J-STAGE: October 17, 2007
    DOIhttps://doi.org/10.14882/jrds.100.0.20089.0
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Objective of this study was to investigate the effectiveness of pre-weaning injection of gonadotropin and artificial insemination (AI) on sow fertility. Sows were randomly assigned to receive gonadotropin 2 days before weaning (n = 20), 1 day after weaning (n = 20) or none as control (n = 20).
    Sows were inseminated twice at 24 and 36 hours after onset of estrus. Estrus detection rates in control and gonadotropin (PG600; 400IU equine Chorionic Gonadotropin, 200IU human Chorionic Gonadotropin) treated groups before and after weaning were 55.0%, 90.0% and 75.0%, respectively. Weaning to onset of estrus was the shortest in lactating sows injected with gonadotropin prior to weaning (P<0.01). There was no significant difference in farrowing rate and litter size between control and treatment groups.
    Results of these experiments indicate 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 of estrus and enhanced fertility in lactating sows. (Keywords: synchronization of estrus, gonadotropin, sows, fixed-time AI)
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