http://hdl.handle.net/10174/970 2026-04-03T18:51:53Z http://hdl.handle.net/10174/39813 Title: Dados que podem salvar vidas: modelação e predição de acidentes de viação para uma segurança rodoviária mais eficaz Authors: Infante, P. Abstract: A sinistralidade rodoviária é um dos grandes problemas da nossa sociedade, tendo consequências sociais relevantes, quer na vida e na saúde das vítimas e dos seus familiares, quer no impacto em outras dimensões da vida em sociedade. O projeto Modelação e Predição de Acidentes de Viação no distrito de Setúbal (MOPREVIS) surgiu com o objetivo fundamental de contribuir para a redução da sinistralidade grave neste distrito. Utilizando alguns dados e resultados obtidos no projeto, este artigo mostra como a aplicação de ferramentas de base matemática num contexto de transdisciplinaridade pode conduzir a resultados muito importantes para apoiar cientificamente a tomada de decisão, contribuindo para tornar mais eficaz a segurança rodoviária. 2023-01-01T00:00:00Z http://hdl.handle.net/10174/24467 Title: VARIAÇÕES FISIOLÓGICAS FACE À ACLIMATAÇÃO SAZONAL – ESTUDO EM VACAS LEITEIRAS COM DIFERENTE POTENCIAL LEITEIRO Authors: Silva, Flávio; Pinheiro, Cristina; Cachucho, Liliana; Matos, C.; Geraldo, Ana; Lamy, Elsa; Capela e Silva, Fernando; Infante, Paulo; Pereira, Alfredo Abstract: This study aimed to evaluate the acclimatisation process of cows with different milk yield potential during summer and winter periods. 13 Holstein Friesian cows were chosen from a dairy farm in Alentejo, 7 of those with high milk yield potential (HMP) and 6 with low milk yield potential (LMP). All cows were evaluated during summer (P1: heat stress) and winter (P2: thermoneutrality) in respiratory frequency (RF), and rectal temperature (RT) as well as milk and blood parameters. RF and RT values were significantly higher in P1 (64.13±12.78 mov./min.; 38.82±0.68 °C) than in P2 (36.13±7.67 mov./min.; 38.06±0.52 °C), without differences between HMP and LMP. Haematocrit and triiodothyronine levels were significantly lower in P1 (23.80±9.39 %; 142.00±13.77 ng/dL) than in P2 (30.70±5.00 %; 170.69±17.78 ng/dL) for both groups. However, in P1, HMP cows presented triiodothyronine blood concentrations significantly lower than the LMP. Milk urea levels, in P1, were significantly higher in the HMP (293.62±35.97 mg/kg) than in LMP (253.69±33.81 mg/kg). These results showed that although HMP cows did not differed significantly in the first responses to heat (RF and RT) from LMP cows, with the acclimatisation process, they showed higher physiological modifications, decreasing the metabolism and changing nitrogen pathways. 2018-01-01T00:00:00Z http://hdl.handle.net/10174/24462 Title: CONTRASTE LEITEIRO: FERRAMENTA DE MONITORIZAÇÃO PARA UMA MELHOR EFICIÊNCIA DAS EXPLORAÇÕES LEITEIRAS - β- HIDROXIBUTIRATO Authors: Domingues, Inês; Vaz, Pedro; Moreira, R.; Infante, P.; Conceição, Cristina Abstract: The interpretation of milk metabolites from milk recording, can be a possible nutritional and management tool for dairy farmers. Some nutrient and metabolic imbalances, can be diagnosed by β-hydroxybutyrate (BHB) concentration in milk. A generalized linear mixed regression model (GLMM) was constructed to determine non-nutritional factors associated with BHB greater than 0.2mmol/L. This study analyzed 110,461 individual milk samples of 9,523 lactating dairy cows collected monthly from January 2015 to March 2017 from 27 herds of South of Portugal. The models show that milk production, the stage and number of lactation, the relation fat/protein, milk fat and somatic cells influenced the BHB concentration. In conclusion the GLMM application optimize the potential of milk recording to advise dairy farmers and non-nutritional factors should be considered. 2018-01-01T00:00:00Z http://hdl.handle.net/10174/24460 Title: RESPOSTAS FISIOLÓGICAS E COMPORTAMENTAIS DE OVELHAS DA RAÇA MERINO SUBMETIDAS A ELEVADAS TEMPERATURAS NO AMBIENTE DO MONTADO ALENTEJANO Authors: Haddade, Ismail; Carreira, Emanuel; Castro, José; Carrilho, Sónia; Fragoso, João; Geraldo, Ana; Infante, Paulo; Pereira, Alfredo Abstract: This experiment was developed in three stages with 12 adults female Merino sheep, six white and six black, aiming at evaluating the differences between these breeds sheep concerning: I. Index of tolerance to heat, II. Thermic balance and heat stock circadian variation, and; III. Adaptive behavior. In the tolerance to heat, the superior stock displayed by the rectal temperatures of black sheep during their stay in the sun was worthy of notice. However, it has fast but incomplete recovery after being exposed to one hour of shade. In the same study, the sweat rates of the black sheep surpassed those of the White ones, that is, after the recovery in the shade. On circadian cycles in shade evaluations, the superiority of rectal temperatures for White sheep deserves to be highlighted. In addition, the sweat rates of the black ones surpassed those of the White ones at the hottest hours. Concerning behavior, it was also possible to notice some differences between the breeds studied here. Among them, we can highlight the superiority in terms of grazing time of White sheep. Differences between the two studied colors of Merino breed occur in the thermic balance as well as in the thermoregulating answers. 2018-01-01T00:00:00Z