Effects of GnRH and prostaglandin combined with a short progestin regimen on the synchrony of estrus and ovulation in ewes during the breeding season

dc.contributor.authorCalhoun, Andy Kyle
dc.contributor.committeeMemberDickison, Will J.
dc.contributor.committeeMemberSalisbury, Micheal
dc.contributor.committeeMemberScott, Cody
dc.contributor.committeeMemberKeith, Susan
dc.contributor.otherAngelo State University. Department of Agriculture.
dc.creatorCalhoun, Andy Kyle
dc.date.accessioned2012-09-14T13:32:58Z
dc.date.available2012-09-14T13:32:58Z
dc.date.issued2012-08-10
dc.date.submitted2012-09-14
dc.description.abstractThe lack of effective, consistent synchronization protocols for ewes is a barrier to the use of artificial insemination in sheep. This study compared the estrus and ovulation percentage and window of synchrony of estrus and ovulation for ewes synchronized with three experimental protocols. The industry’s current standard protocol using PG600, an 11 d CIDR and PGF2a was compared to two alternative protocols utilizing GnRH, a 7 d CIDR and PGF2a. Forty Suffolk ewes were divided into 5 groups and each group was placed on a different protocol. Blood sampling began 18 h following CIDR removal and samples were collected every 2 h for 19 consecutively collections. Mean serum concentrations of LH differed between groups (P<0.05) from 22-42 h following CIDR removal. The two protocols using the shorter 7 d progestin regimen and GnRH to control follicular dynamics resulted in higher estrus and ovulation rates and an acceptable window of synchrony.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2346.1/30022
dc.language.isoen_US
dc.subjectewes
dc.subjectartificial insemination
dc.subjectestrus
dc.subjectovulation
dc.subjectGnRH
dc.subjectCIDR
dc.subjectPGF2a
dc.subjectSuffolk ewes
dc.titleEffects of GnRH and prostaglandin combined with a short progestin regimen on the synchrony of estrus and ovulation in ewes during the breeding season
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.departmentAgriculture
thesis.degree.disciplineAnimal Science
thesis.degree.grantorAngelo State University
thesis.degree.levelMaster
thesis.degree.nameMaster of Science

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