NDLI: Endocrine, ovulatory and reproductive characteristics of sows treated with an intravaginal GnRH agonist.

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Endocrine, ovulatory and reproductive characteristics of sows treated with an intravaginal GnRH agonist.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Stewart, K. R. Flowers, W. L. Rampacek, G. B. Greger, D. L. Swanson, M. E. Hafs, H. D.
Description	Country affiliation: United States Author Affiliation: Stewart KR ( Department of Animal Science, North Carolina State University, Raleigh, NC 27695-7621, USA.)
Abstract	The present study examined the effectiveness of intravaginal administration of a GnRH agonist, triptorelin, on the induction of the preovulatory LH surge; synchronization of time of ovulation; and reproductive characteristics in weaned sows. Sows were given 100microg of triptorelin in 0.9, 1.2, or 1.5% methylcellulose gel intravaginally 96h after weaning and then bred at 8 and 32h post-treatment. Untreated sows inseminated once each day of estrus served as the positive controls, while females treated with only the methyl cellulose gel and also bred once each day of estrus were negative controls. Sows treated intravaginally with triptorelin exhibited preovulatory LH surges with magnitudes comparable to those that occurred spontaneously in the negative controls. Preovulatory LH surges were initiated over a narrow and well-defined time interval that occurred 4-12h after treatment in sows receiving triptorelin in 1.2 or 1.5% methyl cellulose gel. As a result, the majority of the sows in these two treatments had ovulations within a 12h time frame 36-48h after treatment. In contrast, both the LH surge and ovulation occurred over extended periods of time after weaning in negative controls and sows given triptorelin in 0.9% methylcellulose gel. Farrowing rates and litter size were similar between untreated controls and triptorelin-treated sows that were bred with two fixed timed inseminations. Insemination of sows induced to have ovulations and bred at least once while not in estrus did not have any overt negative effects on reproductive characteristics. These results demonstrate that 100microg of triptorelin administered intravaginally in a least 1.2% methyl cellulose gel induced a normal preovulatory LH surge and synchronized time of ovulation in weaned sows. Furthermore, there were no obvious changes in reproductive performance when these sows were bred with two fixed time inseminations regardless of whether they exhibited a standing reflex.
File Format	HTM / HTML
ISSN	03784320
Issue Number	1-4
Volume Number	120
e-ISSN	18732232
Journal	Animal Reproduction Science
Language	English
Publisher	Elsevier
Publisher Date	2010-07-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Animal science Discipline Reproductive Medicine Discipline Veterinary Medicine Discipline Zoology Endocrine System Drug Effects Gonadotropin-releasing Hormone Agonists Ovulation Reproduction Swine Triptorelin Pamoate Pharmacology Administration, Intravaginal Animals Physiology Estradiol Blood Estrus Metabolism Estrus Synchronization Methods Female Fertility Agents, Female Administration & Dosage Luteolytic Agents Ovulation Induction Veterinary Pregnancy Controlled Clinical Trial Journal Article
Content Type	Text
Resource Type	Article
Subject	Medicine Animal Science and Zoology Endocrinology Food Animals

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Endocrine, ovulatory and reproductive characteristics of sows treated with an intravaginal GnRH agonist.

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