The objective of this study was to evaluate the effect of the racial crossing on scrotum-testicular biometric characteristics of four sheep Santa Ines and four crossbred (Santa Ines x Dorper) submitted to scrotal insulation, following the return of these characteristics to values previously reported. For this, two measurements were made regarding the scrotal circumference (SC), length (L) and testicular width (W) before treatments. The testicular volume (V) was calculated by the formula V=2 [(r2) x π x H]. The pouches were made with double-layer plastic, internally lined with cotton, and fixed around the spermatic funiculus and scrotum with adhesive tape and bandage remaining in this position for seven days. Measurements were made every seven days, totaling 15 measurements throughout the experiment. The data were submitted to analysis of variance (ANOVA) to a randomized block design with two blocks, 15 treatments and four replications. The variables analyzed were subjected to Dunnett test at 5% probability, to compare the values obtained before and after insulation. For comparison between the breeds, the variables were submitted to Tukey test at 5% probability. All animals studied suffered significant influence (P<0.05) after scrotal insulation, but Santa Ines returned to the values previously observed in a shorter period than the crossbred. In summary, sheep Santa Ines have a higher resistance than crossbred animals when subjected to thermal stress induced by scrotal insulation.
The study aimed at evaluating the testicular structure and spermatogenesis of Santa Inês and Santa Inês and Dorper crossbred sheep. Sixteen testicles of the animals under study were used, in order to evaluate the volumetric proportion, the diameter of the tubules, the height of seminiferous epithelium, the frequency of stages of the seminiferous epithelium cycle and the spermatogenic yield. The data were submitted to Student-Newman-Keulstestat 5% significance. The tubular diameter was 173.12 ± 29.09 μm and 185.71 ± 29.7 μm, and the height of the seminiferous epithelium was 52.29 ± 9.98 μm and 56.68 ± 11.25 μm, for the crossbred and the Santa Inês, respectively. There was no difference between the testicular compartments and the frequency of the stages of the seminiferous epithelium cycle between the groups. Santa Inês sheep presented a number of 15.36 ± 4.49 spermatocytes in the preleptotene/leptotene stage and 27.42 ± 6.65 spermatocytes in the pachytene, whereas the crossbred presented 13.18 ± 5.19 and 23.48 ± 7.80, respectively. The crossbred showed higher meiotic yield (3.98 ± 1.28) and spermatogenesis yield (3.71 ± 1.02). It is concluded there are differences in testicular morphology and spermatogenesis between Santa Inês sheep and crossbred Dorper/Santa Inês, indicating that the crossbreeding between the Santa Inês and Dorper animals allows a gain in the reproductive potential.
A malassezíase é uma dermatopatia fúngica comum de humanos e animais, causada pela levedura lipofílica Malassezia pachydermatis. O tratamento baseia-se na associação entre antifúngico sistêmico e tópico, contudo, recidivas são frequentes e complicadas por dermatoses intercorrentes que complicam o caso clínico. Essa recorrência comumente deve-se a erros de posologia dos fármacos, de administração dos mesmos por proprietários e por resistência da levedura. Os mecanismos de resistência antifúngica estão associados às características específicas ou adquiridas do patógeno aos fármacos. Como alternativa aos tratamentos tradicionais, o uso de produtos fitoterápicos, como óleos essenciais, na clínica veterinária vem se popularizando. Embora a possível ação dos óleos essenciais seja referida em medicina humana há cerca de 17 anos, a literatura especializada sobre seu uso na malassezíase canina e felina ainda é escassa e carecem estudos que investiguem os mecanismos de ação de óleos essenciais no metabolismo da levedura Malassezia pachydermatis. Desta forma, o objetivo deste trabalho é apresentar uma revisão bibliográfica sobre o uso de quatro óleos essenciais para o tratamento da malassezíase primária ou secundária em cães e gatos.
Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.