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Efficacy of synovex-S ® implants in suppression of estrus in the mare

The objective of this study was to determine if administration of Synovex-S ® implants, approved for use in cattle to promote weight gain and feed efficiency, would suppress the expression of behavioral estrus and/or alter follicular development and ovulation in the mare. Twenty-four clinically norm...

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Bibliographic Details
Published in:Journal of equine veterinary science 1997-06, Vol.17 (6), p.327-329
Main Authors: McCue, P.M., Lemons, S.S., Squires, E.L., Vanderwall, D.K.
Format: Article
Language:English
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Summary:The objective of this study was to determine if administration of Synovex-S ® implants, approved for use in cattle to promote weight gain and feed efficiency, would suppress the expression of behavioral estrus and/or alter follicular development and ovulation in the mare. Twenty-four clinically normal adult horses were randomly assigned to one of four treatment groups (6 mares per group) which received a total of 0, 8, 32 or 80 Synovex-S ® pellets 5 days after ovulation. An implant dose of 8 Synovex-S ® pellets contained a total of 200 mg of progesterone and 20 mg of estradiol benzoate. Mares were monitored daily by teasing and ultrasonography of the reproductive tract per rectum for 45 days. A blood sample was collected daily for progesterone analysis. All mares receiving Synovex-S ® implants returned to estrus at the predicted time. No differences were noted in duration of estrus, interovulatory interval or ovulation rate. In conclusion, subcutaneous administration of 8, 32 or 80 Synovex-S ® pellets did not suppress the expression of behavioral estrus or block ovulation in mares.
ISSN:0737-0806
1542-7412
DOI:10.1016/S0737-0806(97)80092-5