La duración del tratamiento con esponjas intravaginales impregnadas con medroxiprogesterona en la estación reproductiva influye la respuesta a la sincronización de celos en ovejas Corriedale y Merino

Sincronización de celos en ovinos

Keywords: sheep, fertility, estrus synchronization, prolificacy

Abstract

The aim of this work was to compare the effect of 12 or 14 days of treatment with intravaginal sponges (IVS) containing medroxyprogesterone on the reproductive performance of Corriedale and Australian Merino (AM) ewes during the breeding season. Corriedale (weight: 42.4 ± 4.2 kg; mean ± SD) and AM (weight: 38.6 ± 4.0 kg) multiparous ewes were used under randomized block experimental design. The IVS were removed at 12 days (Group IVS12d; n = 224; Corriedale: 110; AM: 114), or 14 days (Group IVS14d; n = 187; Corriedale: 100; AM: 87). The estrus was detected AM and PM during 5 days after IVS withdrawal, using 10% of vasectomized rams. The ewes were submitted to cervical insemination (AI) with fresh semen obtained from rams of their same breed, 12 and 24 h after estrus was detected. Pregnancy and number of fetuses were diagnosed with ultrasound 45 days after AI. The longer permanence of the IVS increased the percentage of estrus (IVS14d: 94.7% vs. IVS12d: 82.6%; P = 0.0003), decreased the interval IVS – estrus (IVS14d: 48.8 ± 1.3 h vs. IVS12d: 58.8 ± 1.3 h; P < 0.0001), and increased the fertility (IVS14d: 72.7% vs. IVS12d: 60.7%, pregnant ewes/treated ewes; P=0.01), without affecting the conception rate (pregnant ewes/inseminated ewes) or the prolificacy (fetus/pregnant ewes). The fecundity was affected by the breed (Corriedale: 0.8 vs. AM: 0.6, fetus/treated ewes; P = 0.04). We concluded that 14 days of treatment with IVS during the breeding season increased and concentrated the estrus presentation without affecting conception rate. As a result, as we used AI associated with estrus detection, the fertility improved Corriedale ewes had greater fecundity than AM ewes, independently of the length of hormonal treatment.

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Author Biography

Raquel Pérez Clariget, Facultad de Agronomía

Prof. Titular Departamento de Producción Animal y Pasturas

References

Abecia, J. A., F. Forcada, A. Gonzalez-Bulnes. 2012. Hormonal control of reproduction in small ruminants. Anim. Reprod. Sci., 230 (4-5): 173-179. doi: 10.1016/j.anireprosci.2012.01.011

Blaschi, W., P. A. Lunardelli, L. S. R Marinho, M. C. Max, G. M. S. Santos, K. C. Silva-Santos, F. A. Melo-Sterza, H. Baldassarre, T. R. Rigo, M. M. Seneda. 2014. Effects of progestagen exposure duration on estrus synchronization and conception rates of crossbreed ewes undergoing fixed time artificial insemination. J. Vet. Sci., 15(3): 433-437. doi: 10.4142/jvs.2014.15.3.433

Deweese, W. P., H. A. Glimp, R. H. Dutt.1970. Comparison of Medroxyprogesterone Acetate Orally and in Vaginal Sponges for Synchronizing Estrus in Ewes. J. Anim. Sci., 31(2): 394-397. doi: 10.2527/jas1970.312394x

Emsen, E., M. Yaprak. 2006. Effect of controlled breeding on the fertility of Awassi and Red
Karaman ewes and the performance of the offspring Small Rumin. Res., 66: 230–235. doi: /10.1016/j.smallrumres.2005.09.022

Gonzalez, R., D. Labuonora, A. Russel. 1997. The effects of ewe live weight and body condition score around mating on production from four sheep breeds in extensive grazing systems in Uruguay. Anim. Sci., 64(1): 139-145. doi: 10.1017/S1357729800015642

Gonzalez-Bulnes, A., A. Menchaca, G. B. Martin, P. Martinez-Ros. 2020. Seventy years of progestagen treatments for management of the sheep oestrous cycle: where we are and where we should go. Reprod. Fert. Dev., 32: 441–452. doi:10.1071/RD18477

Martin G. B., J. T. B. Milton, R. H. Davidson, G. E. Banchero Hunzicker, D. R. Lindsay, D. Blache. 2004. Natural methods for increasing reproductive efficiency in small ruminants Anim. Reprod. Sci., 82–83: 231–246. doi: 10.1016/j.anireprosci.2004.05.014

Menchaca, A., P. C. dos Santos Neto, F. Cuadro. 2017. Estrous synchronization treatments in sheep: Brief update. Rev. Bras. Reprod. Anim. 41: 340-344. http://cbra.org.br/portal/downloads/publicacoes/rbra/v41/n1/p340-344%20(%20RB647).pdf

Moeni, M. M., A. A. Moghaddam, A. Bahirale, H. Hajarian. 2007. Effects of Breed and Progestin Source on Estrus Synchronization and Rates of Fertility and Fecundity in Iranian Sanjabi and Lori Ewes. Pakistan J. Biol. Sci., 10 (21):3801-3807. doi: 10.3923/pjbs.2007.3801.3807

Oyediji, G. O., M. O. Akusu, G. N. Egbunike. 1990. Comparative studies on the effectiveness of sill-estrus implants, Veramix sheep sponges and prostaglandin in synchronizing estrus in West African dwarf sheep. Theriogenology 34 (3): 613-618. doi: 10.1016/0093-691x(90)90016-m

Rhodes, L., P. W. Nathanielsz. 1988. Comparison of a controlled internal drug release device containing progesterone with intravaginal medroxyprogesterone sponges for estrus synchronization in ewes. Theriogenology 30(4): 831-836. doi:10.1016/0093-691X(88)90317-2

Romano, J. E., E. Rodas, A. Ferreira, I. Lago, A. Benech. 1997. Effects of progestagen, PMSG and artificial insemination times on fertility and prolificicacy in Corriedale ewes. Small Rumin. Res., 23: 157–162. doi:10.1016/S0921-4488(96)00904-2

Romano, J. E., C. J. Christians, B. G. Crabo. 2000. Continuous presence of rams hastens the onset of estrus in ewes synchronized during the breeding season. Appl. Anim. Behav. Sci., 66: 65–70. doi: 10.1016/S0168-1591(99)00076-3

Scales, G. H. 1967. Fertility following synchronization of oestrus in Romney, Corriedale and Merino ewes. N. Z. Vet. J., 15(10): 175-177. doi: 10.1080/00480169.1967.33720

Simonetti, L., M. R. Blanco, J. C. Gardón. 2000. Estrus synchronization in ewes treated with sponges impregnated with different doses of medroxyprogesterone acetate. Small Rumin. Res., 38: 243±247. doi: 10.1016/S0921-4488(00)00160-7

Viñoles, C., M. Forsberg, G. Banchero, E. Rubianes. 2001. Effect of long-term and short-term progestagen treatment on follicular development and pregnancy rate in cyclic ewes. Theiogenology, 55: 993-1004. doi: 10.1016/s0093-691x(01)00460-5

Viñoles, C., A. Meikle, G. B. Martin. 2009. Short-term nutritional treatments grazing legumes or feeding concentrates increase prolificacy in Corriedale ewes. Anim. Reprod. Sci., 113(1-4): 82-92. doi: 10.1016/j.anireprosci.2008.05.079

Ustuner, B., U. Gunay, Z. Nur, H. Ustuner. 2007. Effects of Long and Short-Term Progestagen Treatments Combined with PMSG on Oestrus Synchronization and Fertility in Awassi Ewes during the Breeding Season. Acta Vet. Brno, 76: 391-397. doi: 10.2754/avb200776030391

Wildeus, S. 1999. Current concepts in synchronization of estrus: sheep and goats. J. Anim. Sci., 39(E-Suppl): 1-14. doi: 10.2527/jas2000.00218812007700ES0040x

Yu, X. J., J. Wang, Y. Y. Bai. 2018. Estrous synchronization in ewes: The use of progestogens and prostaglandins. Acta Agric. Scand. A. Anim. Sci., 68(4): 219-230. doi: 10.1080/09064702.2019.1674373
Published
2021-03-05
How to Cite
Pérez Clariget, Raquel, Carlos López Mazz, María Belén López Pérez, and Álvaro López Pérez. 2021. “La duración Del Tratamiento Con Esponjas Intravaginales Impregnadas Con Medroxiprogesterona En La estación Reproductiva Influye La Respuesta a La sincronización De Celos En Ovejas Corriedale Y Merino : Sincronización De Celos En Ovinos”. Latin American Archives of Animal Production 29 (1-2), 29-36. https://doi.org/10.53588/alpa.291204.
Section
Original paper