RESUMO
The aim of this study was to assess the addition of 2% sodium caseinate in a commercial egg yolk-based medium in frozen ovine semen. Eight Dorper males were used for the study. The ejaculate was divided into two portions and frozen without (G1) or with the addition of 2% sodium caseinate (G2). Kinetic parameters were evaluated using CASA (computer-assisted sperm analysis), and membrane and acrosome integrity as well as oxidative stress were assessed using flow cytometry. After thawing, a thermoresistance test was conducted at time points T0 and T90. For the fertility test, 100 ewes were inseminated with semen from two rams selected based on in vitro parameters, one with good post-thaw quality (+70% total motility) and the other with low post-thaw quality (-55% total motility). For the fertility test, the females were divided into 4 groups for insemination: low-quality ram without caseinate (GBS = 25) and with caseinate (GBC = 25), and high-quality ram without caseinate (GAS = 25) and with caseinate (GAC = 25). Regarding the results of sperm kinetics, there was a statistically significant difference in the parameters of average path velocity (VAP) and curvilinear velocity (VCL) between the group frozen with BotuBov and the group with added caseinate. At time point T90, straight-line velocity maintained a trend (p < .06), with BotuBov® (BB group) being superior to caseinate this time, and in the linearity parameter, caseinate was superior to BotuBov®. Flow cytometry analysis showed no difference between any of the evaluated tests. In the fertility test, there was no statistically significant difference in the pregnancy rate between the BotuBOV® group (23%, 11/48) and the sodium caseinate group (BC group) (33%, 17/52), and no differences were observed in the male versus diluent interaction (p = .70). In conclusion, sodium caseinate supplementation did not influence sperm kinetic parameters and the fertility of sheep.
Assuntos
Caseínas , Criopreservação , Inseminação Artificial , Análise do Sêmen , Preservação do Sêmen , Motilidade dos Espermatozoides , Animais , Preservação do Sêmen/veterinária , Preservação do Sêmen/métodos , Masculino , Feminino , Criopreservação/veterinária , Criopreservação/métodos , Inseminação Artificial/veterinária , Caseínas/farmacologia , Análise do Sêmen/veterinária , Gravidez , Motilidade dos Espermatozoides/efeitos dos fármacos , Espermatozoides/efeitos dos fármacos , Espermatozoides/fisiologia , Crioprotetores/farmacologia , Sêmen/efeitos dos fármacos , Fertilidade/efeitos dos fármacos , Ovinos , Carneiro DomésticoRESUMO
O Herpesvirus bovino tipo 5 (BoHV-5) tem sido recentemente descrito no sêmen contaminado. Apesar de ter sido identificado no sêmen bovino, sua influência na produção de embriões in vitro não foi ainda relatada. O presente estudo teve como objetivo verificar a susceptibilidade de oócitos bovinos maturados e fertilizados invitro, com sêmen congelado, infectado experimentalmente com BoHV-5, antes da congelação, avaliando-se o desenvolvimento embrionário subsequente e o possível carreamento do vírus para o embrião via espermatozoide. Ejaculados de touro foram misturados e divididos em dois grupos: Grupo I, sêmen não exposto ao vírus e, Grupo II, sêmen exposto ao vírus. A presença do BoHV-5 foi investigada através de PCR e teste de hibridização in situ (ISH). Os dados foram analisados através de Teste-t de Student com P< 0,05 considerado como significativo. O vírus foi detectado em embriões avaliados com 168 h pós-inseminação. Não houve diferença significativa entre os diferentes grupos de tratamento para as taxas de produção in vitro de embriões para os respectivos estágios de desenvolvimento. Assim, conclui-se que, o sêmen contaminado com o BoHV-5 pode infectar os oócitos durante a fertilização in vitro, com carreamento do vírus para os embriões, não afetando, porém, o seu desenvolvimento in vitro.(AU)
Bovine herpesvirus type 5 (BoHV-5) has been recently described from contaminated semen. Despite having been identified in bovine semen, its transmission through use of infected fresh semen, just before freezing, on the in vitro embryo production has not yet been reported so far. Thus, this study was carried out to investigate the susceptibility of matured bovine oocytes to BoHV-5 infection after using frozen semen previously exposed to the virus, and their ability to develop for advanced blastocyst stages following in vitro fertilization (IVF). Ejaculates from bulls were mixed and divided into two groups, as follows: Group 1, semen not exposed to the virus, and Group 2, infected sperm. The presence of BoHV-5 was investigated by PCR and in situ hybridization assays. Results were analyzed through use of Student t - test with P < 0.05 considered as significant. The virus was detected in blastocysts evaluated at 168 h post-insemination. There was no significant difference between groups for the in vitro embryo production at any developmental stage. Thus, it is concluded that semen infected with BoHV-5 can infect oocytes during IVF, with the virus transmission to embryos via sperm; however, embryonic development was not impaired, as evidenced by the subsequent blastocyst formation.(AU)
Assuntos
Animais , Bovinos , Embrião de Mamíferos , Preservação do Sêmen , Preservação do Sêmen/veterinária , Desenvolvimento Embrionário , Herpesvirus Bovino 5RESUMO
O Herpesvirus bovino tipo 5 (BoHV-5) tem sido recentemente descrito no sêmen contaminado. Apesar de ter sido identificado no sêmen bovino, sua influência na produção de embriões in vitro não foi ainda relatada. O presente estudo teve como objetivo verificar a susceptibilidade de oócitos bovinos maturados e fertilizados invitro, com sêmen congelado, infectado experimentalmente com BoHV-5, antes da congelação, avaliando-se o desenvolvimento embrionário subsequente e o possível carreamento do vírus para o embrião via espermatozoide. Ejaculados de touro foram misturados e divididos em dois grupos: Grupo I, sêmen não exposto ao vírus e, Grupo II, sêmen exposto ao vírus. A presença do BoHV-5 foi investigada através de PCR e teste de hibridização in situ (ISH). Os dados foram analisados através de Teste-t de Student com P< 0,05 considerado como significativo. O vírus foi detectado em embriões avaliados com 168 h pós-inseminação. Não houve diferença significativa entre os diferentes grupos de tratamento para as taxas de produção in vitro de embriões para os respectivos estágios de desenvolvimento. Assim, conclui-se que, o sêmen contaminado com o BoHV-5 pode infectar os oócitos durante a fertilização in vitro, com carreamento do vírus para os embriões, não afetando, porém, o seu desenvolvimento in vitro.
Bovine herpesvirus type 5 (BoHV-5) has been recently described from contaminated semen. Despite having been identified in bovine semen, its transmission through use of infected fresh semen, just before freezing, on the in vitro embryo production has not yet been reported so far. Thus, this study was carried out to investigate the susceptibility of matured bovine oocytes to BoHV-5 infection after using frozen semen previously exposed to the virus, and their ability to develop for advanced blastocyst stages following in vitro fertilization (IVF). Ejaculates from bulls were mixed and divided into two groups, as follows: Group 1, semen not exposed to the virus, and Group 2, infected sperm. The presence of BoHV-5 was investigated by PCR and in situ hybridization assays. Results were analyzed through use of Student t - test with P < 0.05 considered as significant. The virus was detected in blastocysts evaluated at 168 h post-insemination. There was no significant difference between groups for the in vitro embryo production at any developmental stage. Thus, it is concluded that semen infected with BoHV-5 can infect oocytes during IVF, with the virus transmission to embryos via sperm; however, embryonic development was not impaired, as evidenced by the subsequent blastocyst formation.
Assuntos
Animais , Bovinos , Desenvolvimento Embrionário , Embrião de Mamíferos , Preservação do Sêmen , Preservação do Sêmen/veterináriaRESUMO
Persistent mating-induced endometritis (PMIE) results in decreased fertility in horses, thereby causing a significant impact in the horse market. Platelet-rich plasma (PRP), a modulator of the inflammatory response, has been largely used in veterinary medicine. Here, we investigated the effects of PRP on uterine inflammation, conception rate, endometrial polymorphonuclear neutrophil (PMN) migration, and COX-2 protein levels in the endometrial tissue. Thirteen PMIE-susceptible mares were used for artificial insemination (AI). The mares were inseminated with fresh semen in three consecutive cycles in a cross-over study design. The following cycle classifications were used: control cycle, no pharmacological interference; pre-AI, 20 mL of PRP was infused 24 h before AI; and post-AI, 20 mL of PRP was infused four h after AI. Follicular dynamics were monitored daily by transrectal ultrasound. When a follicle larger than 35 mm was detected, ovulation was induced with deslorelin acetate (1 mg, im). AI was performed 24 h after ovulation induction. Intrauterine fluid (FLU) was evaluated by ultrasonography before and 24 h after AI. PMNs in uterine cytology (CYT) and biopsy (HIS) were also observed before and 24 h after AI. Pregnancy was determined within 14 days after ovulation. Number of COX-2 positive cells was evaluated by immunohistochemistry. Both PRP treatments resulted in a decrease of PMNs in the CYT after breeding when compared to controls. FLU did not differ between cycles; however, the conception rates were significantly higher in the PRP mares. Mares positive for endometritis decreased in both treatment groups, and a more intense positive COX-2 labeling was observed in the control group when compared to the two treatment groups. In conclusion, PRP beneficially reduces inflammatory response in PMIE mares independent of when treatments were administered, thus increasing chances of successful pregnancy.