https://repositorio.ufu.br/handle/123456789/5157 2026-08-24T05:45:38Z 2026-08-24T05:45:38Z https://repositorio.ufu.br/handle/123456789/49693 2026-08-20T06:25:27Z 2026-08-03T00:00:00Z

Title: Métodos de avaliação do processamento de grãos na ensilagem de milho planta inteira Abstract: The evaluation of the degree of corn kernel processing is an important step in determining silage quality, as it directly influences starch availability and its utilization by ruminants. In this context, the present study aimed to compare the 4.75-mm sieve method and a digital image analysis method using the SilageSnap application for evaluating kernel processing during whole-plant corn ensiling. The experiment was conducted at Fazenda do Glória, belonging to the Federal University of Uberlândia, in the Dairy Cattle Sector (SEBOL), during the whole- plant corn ensiling period. Sixteen composite samples were collected directly from the material unloaded into the bunker silo before compaction. For the digital method, 20-g subsamples were washed with water to separate the kernels, prepared, and analyzed using the SilageSnap application. For the sieving method, 100-g subsamples were washed with water to separate the kernels, dried, sieved through a 4.75-mm sieve, and the percentage of particles passing through the sieve was determined. Data were analyzed using a completely randomized design, and means were compared by the F-test at a 5% significance level. The sieving method showed a mean of 53.97% of particles below 4.75 mm, whereas the SilageSnap application showed a mean of 61.36%, with a significant difference between the methods. The SilageSnap application showed potential as a tool for evaluating corn kernel processing, estimating higher percentages of particles below 4.75 mm than those obtained by the sieving method. Under the conditions in which this study was conducted, the sieving method proved to be more practical for field application.

2026-08-03T00:00:00Z 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/123456789/49657 2026-08-19T06:23:14Z 2026-08-07T00:00:00Z

Title: Memorial de atividades acadêmicas para promoção à classe de Professor Titular da carreira do Magistério Superior

2026-08-07T00:00:00Z https://repositorio.ufu.br/handle/123456789/49610 2026-08-19T06:23:10Z 2026-07-20T00:00:00Z

Title: Avaliação do sistema FDN fisicamente ajustado em vacas em lactação primíparas e multíparas Abstract: The National Academies of Sciences, Engineering, and Medicine (NASEM, 2021) introduced the concept of physically adjusted neutral detergent fiber (paNDF) to establish recommendations for dietary particle size based on ruminal pH and its interactions with other dietary components. However, this system still requires validation under field conditions. This study aimed to evaluate the application of the paNDF system in primiparous, and multiparous lactating dairy cows fed a total mixed ration. A total of 46 lactating cows were used, including 19 primiparous and 27 multiparous animals, housed in a Compost Barn system. Rumination time was monitored using CowMed® electronic collars, whereas predicted rumination time and the recommended percentage of particles retained on the 8 mm sieve were estimated using the MUNCH application based on the percentage of particles retained on the 19-mm sieve, neutral detergent fiber (NDF), acid detergent fiber (ADF), crude protein (CP), dietary starch content, and body weight. The experiment was conducted in a completely randomized design with repeated measures over time. Multiparous cows showed longer rumination time than primiparous cows; however, both groups remained above 500 minutes of rumination per day. Observed rumination times were greater than those predicted by the paNDF system, indicating discrepancies between model estimates and field responses. No significant correlation was found between rumination time recorded by the electronic collars and that predicted by the paNDF system using the MUNCH application. In contrast, physically effective neutral detergent fiber (peNDF) values were more consistent with the responses observed in the animals. Diets presented peNDF levels compatible with adequate rumination, and the correlations observed between peNDF and rumination time indicated that this parameter more accurately represented the physical effectiveness of fiber under the evaluated conditions. The paNDF system could not adequately predict the rumination behavior of dairy cows. Conversely, the peNDF concept showed a stronger association with the observed responses, suggesting greater applicability for evaluating the physical effectiveness of fiber in diets with a higher proportion of forage and lower starch concentrations. Further studies are required to validate and adjust the paNDF system to the feeding conditions commonly found in Brazilian dairy production systems.

2026-07-20T00:00:00Z