Synchronization of estrus with short- and long-term progestagen treatments and the use of GnRH prior to short-term progestagen treatment in ewes

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dc.authoridATAMAN, MEHMET BOZKURT/0000-0001-5992-4804
dc.contributor.authorKaraca, F.
dc.contributor.authorAtaman, M. B.
dc.contributor.authorCoyan, K.
dc.date.accessioned2024-09-18T20:55:28Z
dc.date.available2024-09-18T20:55:28Z
dc.date.issued2009
dc.departmentHatay Mustafa Kemal Üniversitesien_US
dc.description.abstractThe objective of the present study was to determine the efficacy of the synchronization of estrus using short- and long-term progestagen treatments in ewes at the onset of the breeding season, and to evaluate the effect of the exogenous GnRH administration immediately prior to short-term progestagen treatment on the reproductive performance. A total of 240 Tahirova cross-bred ewes, aged 18-24 months, and 40 rams, aged 2-4 years-old, were used in the trial. Ewes were divided equally into 3 groups (n=80 per group). Intravaginal progestagen sponges containing FGA (30 mg) were inserted in the ewes for 7 d in the FGA1 (short-term) and GnRH treatment groups, and for 12d in the FGA2 group (long-term). The ewes in the GnRH group received 10.5 mu g busereline acetate i.m. at the time of sponge insertion. Tiaprost tromethamol (PGF(2 alpha),; 0.294 mg) and eCG (400 IU) were injected i.m. on the 6th day of progestagen treatment in the GnRH and FGA1 groups, and on the 11 th day in the FGA2 group following sponge insertion. All ewes were hand-mated once at the detection of estrus. The estrous response, fertility rate, multiple birth rate and litter size recorded was 88.7, 87.3,51.6% and 1.6 in the FGA1 group, 92.5, 71.6, 50.9% and 1.5 in the FGA2 group, and 96.2, 89.6, 71.0% and 1.8 in the GnRH group, respectively. No significant difference in estrous response between the groups was recorded, but the fertility rate in the FGA1 and GnRH groups was significantly (P<0.05) higher than in the FGA2 group. The occurrence of multiple births and litter sizes were significantly (P<0.05) higher in the GnRH group, compared to both the FGA1 and FGA2 groups, with the number of single lambs being significantly (P<0.05) higher in the FGA1 (48.4%) and FGA2 (49.0%) groups than in the GnRH (29.0%) group. However, the differences recorded between any of the groups in terms of the number of twin and triplet lambs were insignificant. In conclusion, it can be said that estrous synchronization using the 12-d-FGA-eCG-PGF(2 alpha) regimen could be replaced with the 7-d-FGA-eCG-PGF(2 alpha) regime in sheep at the onset of the breeding season. However, the combination of GnRH with the latter regimen (7-d-GnRH-FGA-eCG-PGF(2 alpha)) increased the multiple birth rate and litter size in the ewes. (C) 2008 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.smallrumres.2008.12.002
dc.identifier.endpage188en_US
dc.identifier.issn0921-4488
dc.identifier.issn1879-0941
dc.identifier.issue2-3en_US
dc.identifier.scopus2-s2.0-59349092683en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage185en_US
dc.identifier.urihttps://doi.org/10.1016/j.smallrumres.2008.12.002
dc.identifier.urihttps://hdl.handle.net/20.500.12483/11844
dc.identifier.volume81en_US
dc.identifier.wosWOS:000264040300020en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofSmall Ruminant Researchen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectProgesteroneen_US
dc.subjectGonadotropinsen_US
dc.subjectPGF(2 alpha)en_US
dc.subjectEstrous synchronizationen_US
dc.subjectEwesen_US
dc.titleSynchronization of estrus with short- and long-term progestagen treatments and the use of GnRH prior to short-term progestagen treatment in ewesen_US
dc.typeArticleen_US

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