Response of the lactating and postweaning sow to gonadotropin releasing hormone (GnRH) |
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| Authors: | A Ogasa T Tsutsui E Kawakami M Sone T Kawarasaki S Iwamura |
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| Affiliation: | Department of Reproduction, Nippon Veterinary and Animal Science University, Musashino, Japan. |
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| Abstract: | Clinical and endocrinological responses to administration of gonadotropin releasing hormone analog (LH-RH-A) during the lactation period and postweaning in the sow were investigated. Plasma LH concentrations in lactating sows rose immediately after administration of LH-RH-A. However, in postweaning sows the increase of LH level was more slowly. Three of 5 postweaning sows came into estrus and ovulated after LH-RH-A treatment. One sow exhibited a distinct LH response, but her ovaries remained quiescent. The remaining one with feeble estrus for a short period became cystic ovaries. Thus, LH response to GnRH in the sow seems to be higher during early lactation than at 2 days postweaning. |
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