https://repositorio.ufu.br/handle/123456789/18916 2026-08-24T20:12:30Z 2026-08-24T20:12:30Z https://repositorio.ufu.br/handle/123456789/49667 2026-08-20T06:25:33Z 2026-08-07T00:00:00Z

Title: Ixodofauna e circulação de Rickettsia parkeri em cães na região de Guaxupé em Minas Gerais Abstract: Ticks are hematophagous ectoparasites of extreme importance to public, human, and animal health, acting as vectors for many diseases, such as spotted fever. In Brazil, a wide variety of tick species is found distributed across different biomes and climates, with the genus Am-blyomma holding the greatest importance regarding public health. Considering its significance, recent studies highlight the relevance of Amblyomma ovale, which is responsible for harboring and transmitting the bacteria Rickettsia parkeri strain Atlantic rainforest. This bacteria causes a variant of Brazilian spotted fever that is, however, non-lethal and presents milder symptoms. Considering the dog as an important host for the adult stages of Amblyomma ovale, along with the interface between humans, dogs, and the Atlantic Forest, the favorable biome for this tick, we will seek to evaluate the occurence of this ectoparasite in the city of Guaxupé, Minas Gerais. Additionally, we aim to determine the presence of Rickettsia parkeri strain Atlantic rainforest in both ticks and host dogs with access to forest areas within the municipality. A total of 188 ticks were collected from 30 dogs, R. sanguineus linnaei (adults, n = 113), follo-wed by A. ovale (adults, n = 67), A. sculptum (nymphs, n = 4; adult, n = 1), and R. microplus (adults, n = 3). Of the 30 dogs with evaluated serology, 46.9% were seroreactive to R. parkeri, 50% to R. rickettsii, and 21.9% to R. bellii. The highest titers were found in 5 dogs for R. par-keri: 2 with a titer of 1024, 1 with 2048, and 2 with 4096. No amplification was observed for any rickettsial gene in the ticks subjected to DNA extraction and PCR. The tick with the highest intensity and abundance of infestation was R. linnaei, which is associated with dogs exhibiting more domiciled behavior, while the most prevalent was A. ovale, thus indicating the dogs' frequent access to humid forest areas, the habitat of this tick species. The occurrence of A. sculptum nymphs is associated with the study period coinciding with its peak activity sea-son and the predominance of this stage in dogs, and the R. microplus found is associated with the roaming behavior of dogs, accessing areas with cattle circulation, the host of this species. The dogs' serology showed high reactivity to spotted fever group (SFG) bacteria, with the highest titers for R. parkeri CMA. The correlation between dogs with high titers for R. parkeri CMA and the prevalence of A. ovale may indicate Guaxupé (MG) as a probable risk area for Atlantic rainforest spotted fever.

2026-08-07T00:00:00Z https://repositorio.ufu.br/handle/123456789/49559 2026-08-15T06:28:08Z 2026-08-03T00:00:00Z

Title: Desenvolvimento corporal e escrotal em animais jovens da raça Nelore e seus cruzamentos com Angus e Senepol

2026-08-03T00:00:00Z https://repositorio.ufu.br/handle/123456789/49510 2026-08-14T06:19:03Z 2026-03-20T00:00:00Z

Title: Avaliação do tamanho de urólitos em cadáveres de cães através da radiografia e ultrassonografia Abstract: This study aimed to compare the accuracy of ultrasonography and radiography in measuring the size of vesical uroliths in canine cadavers. Three canine cadavers were used, in which uroliths with standardized diameters of 0.5 cm, 1.1 cm, and 1.9 cm were surgically implanted. Two observers performed three measurements of each urolith using three imaging approaches: ultrasonography based on the hyperechoic surface, ultrasonography considering the acoustic shadow, and plain radiography. Statistical analysis included intraobserver variance, interobserver variance, concordance correlation, and Bland–Altman bias analysis. Ultrasonographic methods showed higher agreement with the real size of the uroliths, particularly measurements based on the acoustic shadow, which presented lower dispersion. Radiography showed lower concordance and greater variability in measurements. In conclusion, ultrasonography, especially when evaluating the acoustic shadow, proved to be a more consistent method for estimating vesical urolith size in the experimental model used.

2026-03-20T00:00:00Z https://repositorio.ufu.br/handle/123456789/49485 2026-08-13T06:29:12Z 2026-08-03T00:00:00Z

Title: Perfil seminal de cães da raça Spitz Alemão criados em canis Abstract: Dogs currently play an important role in Brazil, and the German Spitz is one of the most registered dog breeds in the country. Furthermore, the commercialization of genetic material from these animals has grown exponentially. Considering the limited information available in the literature regarding the andrological examination of this breed, this study aimed to evaluate the seminal profile and andrological characteristics of German Spitz dogs. Ejaculates from 15 dogs aged between 1.6 and 9 years were collected by digital manipulation. Physical, kinetic, and morphological semen evaluations were performed according to the routine procedures recommended by the Brazilian College of Animal Reproduction. The mean age of the animals was 50 ± 26.17 months, and the mean seminal parameters were as follows: motility, 77.3 ± 10.3%; vigor, 2.93 ± 0.45; sperm concentration, 68.78 ± 62.85 million spermatozoa/mL; and total sperm defects, 20.4 ± 12.42%. In addition, the mean testicular volume was 2.26 ± 0.36 cm³ for dogs classified as toy-sized and 5.59 ± 2.15 cm³ for those classified as small-sized. Overall, the evaluated German Spitz dogs demonstrated good sperm production potential and satisfactory semen quality.

2026-08-03T00:00:00Z