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dc.contributorHaile, Aynalemen_US
dc.contributorAtilaw, Abebeen_US
dc.contributorMuluneh, Den_US
dc.contributorGoshme, Sen_US
dc.contributorBen Salem, Imeneen_US
dc.contributorHilali, Muhi El-Dineen_US
dc.contributorLassoued, Narjessen_US
dc.contributorChanyalew, Yeshimebeten_US
dc.contributorRischkowsky, Barbaraen_US
dc.creatorRekik, Mouraden_US
dc.identifier.citationMourad Rekik, Aynalem Haile, Abebe Atilaw, D Muluneh, S Goshme, Imene Ben Salem, Muhi El-Dine Hilali, Narjess Lassoued, Yeshimebet Chanyalew, Barbara Rischkowsky. (31/12/2016). GnRH and prostaglandin-based synchronization protocols as alternatives to progestogen-based treatments in sheep. Reproduction in Domestic Animals, 51(6), pp. 924-929.en_US
dc.description.abstractThe study investigated, for cycling sheep, synchronizing protocols simultaneously to the standard “P” protocol using progestogens priming with intravaginal devices and gonadotropin. In November 2014, 90 adult Menz ewes were assigned to either the “P” protocol, “PGF” treatment where oestrus and ovulation were synchronized using two injections of prostaglandin 11 days apart or a “GnRH” treatment where the ewes had their oestrus and ovulation synchronized with GnRH (day 0)–prostaglandin (day 6)– GnRH (day 9) sequence. The ewes were naturally mated at the induced oestrus and the following 36 days. Plasma progesterone revealed that 92% of the ewes were ovulating before synchronization and all, except one, ovulated in response to the applied treatments. All “P” ewes exhibited oestrus during the 96-hr period after the end of the treatments in comparison with only 79.3% and 73.3% for “PGF” and “GnRH” ewes, respectively (p ˂ .05). Onset and duration of oestrus were affected by the hormonal treatment (p ˂ .05); “GnRH” ewes showed oestrus earliest and had the shortest oestrus duration. Lambing rate from mating at the induced oestrus was lower for “P” than for “PGF” ewes (55.6% and 79.3%, respectively; p ˂ .05). The same trait was also lower for “P” than for “PGF” and “GnRH” ewes (70.4%, 89.7% and 86.7%, respectively; p ˂ .05) following the 36-day mating period. Prostaglandin and GnRH analogue-based protocols are promising alternatives for both controlled natural mating and fixed insemination of Menz sheep after the rainy season when most animals are spontaneously cycling.en_US
dc.publisherWiley: 12 monthsen_US
dc.sourceReproduction in Domestic Animals;51,(2016) Pagination 924,929en_US
dc.titleGnRH and prostaglandin-based synchronization protocols as alternatives to progestogen-based treatments in sheepen_US
dc.typeJournal Articleen_US
cg.subject.agrovocrural communitiesen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerEthiopian Institute of Agricultural Research - EIARen_US
cg.contributor.centerDebre Berhan Sheep Improvement and Multiplication Center of the Amhara Livestock Agencyen_US
cg.contributor.centerAmhara Regional Agricultural Research Institute, Debre Birhan Agricultural Research Center - ARARI-DBARCen_US
cg.contributor.centerManouba University, National School of Veterinary Medicine of Sidi Thabeten_US
cg.contributor.centerInstitut National de la Recherche Agronomique de Tunisie; National Agricultural Research Institute of Tunisia - INRATen_US
cg.contributor.crpCRP on Livestock and Fish - L&Fen_US
cg.contributor.funderInternational Livestock Research Institute - ILRIen_US
cg.contributor.projectCGIAR Research Program on Livestock and Fish (CRP 3.7)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionEastern Africaen_US
dc.identifier.statusLimited accessen_US

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