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

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Title: Effects of GNRH and prostaglandin combined with a short progestin regimen on the synchrony of estrus and ovulation in ewes during the breeding season
Author: Calhoun, Andy
Abstract: The 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 .
URI: http : / /hdl .handle .net /2346 .1 /30022
Date: 2012-08-10

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Calhoun, Andy Effects of GNRH and prostaglandin combined with a short progestin regimen on the synchrony of estrus and ovulation in ewes during the breeding season. Master's thesis, Angelo State University. Available electronically from http : / /hdl .handle .net /2346 .1 /30022 .

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