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resumen

Resumen
In most ram breeds, there are annual changes in testosterone serum concentration and semen quality. This study aimed to determine if eCG administration to rams during the non-breeding season improves the reproductive activity. In the first study, we compared the effects of administering three doses of eCG (0, 400 or 700 IU). In the second experiment we compared the effects of administering eCG to rams from two breeds originated in different latitudes, and [ver mas...]
dc.contributor.authorBeracochea, Florencia
dc.contributor.authorManes, Jorgelina
dc.contributor.authorViera, Maria Noel
dc.contributor.authorSantiago-Moreno, Julian
dc.contributor.authorUngerfeld, Rodolfo
dc.date.accessioned2020-08-20T12:01:25Z
dc.date.available2020-08-20T12:01:25Z
dc.date.issued2020-06
dc.identifier.issn1871-1413
dc.identifier.otherhttps://doi.org/10.1016/j.livsci.2020.104125
dc.identifier.urihttp://hdl.handle.net/20.500.12123/7742
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S1871141320304200
dc.description.abstractIn most ram breeds, there are annual changes in testosterone serum concentration and semen quality. This study aimed to determine if eCG administration to rams during the non-breeding season improves the reproductive activity. In the first study, we compared the effects of administering three doses of eCG (0, 400 or 700 IU). In the second experiment we compared the effects of administering eCG to rams from two breeds originated in different latitudes, and thus, with different expected reproductive seasonal pattern (Highlander; HL and Texel; TEX). The first study was performed during the mid non-breeding season with three groups of rams: treated with 400 IU (group eCG400) or 700 IU of eCG (group eCG700), or untreated controls (group CON). Treated rams received three doses of eCG administered every 6 days. Testosterone concentration, testicular traits (scrotal circumference, testicular and sexual skin flush, and ultrasonographic testes pixel color intensity) and seminal characteristics were determined from five days before the first eCG administration until Day 24. Testosterone concentration was greater in eCG700 than in eCG400 (P <0.001) and CON (P <0.0001) rams, and in eCG400 than in CON rams (P = 0.0002). However, the treatment did not modify the testicular traits and seminal quality. The second study was performed with 15 HL and 17 TEX rams; while 8 HL and 9 TEX rams received two doses of 1000 IU of eCG (Days 0 and 5), the other rams remained as untreated controls. Scrotal circumferences, seminal traits (fresh and thawed semen, and cryopreservation ratio –CR-) as well as the sexual behavior were determined, twice before eCG administration and during 3 weeks. The treatment did not modify the scrotal circumference nor the fresh sperm traits evaluated. However, the CR of motile and progressive motile sperm were greater in eCG treated rams than in control rams on Day 7 (P = 0.01 for both). Treated rams had their second and third ejaculations earlier than control rams (P = 0.001 and P = 0.02; respectively). In conclusion, the administration of eCG during the non-breeding season stimulated testosterone secretion without modifying the main reproductive outcomes of rams. Reducing the interejaculatory intervals could be considered for intensive semen collection programs.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceLivestock Science 240 : 104125 (October 2020)es_AR
dc.subjectOvinoses_AR
dc.subjectSheepeng
dc.subjectPMSGes_AR
dc.subjectEspermatozooes_AR
dc.subjectSpermatozoaeng
dc.subjectTestículoses_AR
dc.subjectTesteseng
dc.subjectReproducción Animales_AR
dc.subjectAnimal Reproductioneng
dc.titleAdministration of equine Chorionic Gonadotrophin (eCG) to rams to improve the reproductive performance during the non-breeding seasones_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Balcarcees_AR
dc.description.filFil: Beracochea, Florencia. Universidad de la República. Facultad de Veterinaria; Uruguayes_AR
dc.description.filFil: Manes, Jorgelina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentinaes_AR
dc.description.filFil: Viera, María Noel. Universidad de la República. Facultad de Veterinaria; Uruguayes_AR
dc.description.filFil: Santiago-Moreno, Julián. Instituto de Investigación y Tecnología Agraria y Alimenticia. Departamento de Reproducción Animal; Españaes_AR
dc.description.filFil: Underfeld, Rodolfo. Universidad de la República. Facultad de Veterinaria; Uruguayes_AR
dc.subtypecientifico


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