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dc.contributor.authorCaparelli, Nicolas Moreira Piedras Monnerat-
dc.date.accessioned2024-11-27T13:49:00Z-
dc.date.available2024-11-27T13:49:00Z-
dc.date.issued2023-01-16-
dc.identifier.citationCAPARELLI, Nicolas Moreira Piedras Monnerat. Efeito das estações do ano sobre a taxa de prenhez de fêmeas bovinas leiteiras mestiças. 2023. 29 f. Dissertação (Mestrado em Medicina Veterinária) - Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2023.pt_BR
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/19204-
dc.description.abstractA presença de fatores estressantes destaca-se como um dos principais elementos correlacionados à queda no desempenho produtivo e reprodutivo em bovinos. O estresse térmico tem sido discutido como um dos principais fatores a impactar a pecuária devido a crescente modificação das condições climáticas no mundo, em especial a elevação da temperatura. Em vacas de leite, o estresse térmico possui efeitos deletérios em diversas etapas do desenvolvimento reprodutivo, diminuindo a fertilidade dos rebanhos por diferentes vias. O índice de temperatura e umidade (ITU) tem sido utilizado amplamente como um indicador capaz de estimar o grau de conforto térmico na unidade de produção e por possuir correlação positiva com parâmetros fisiológicos indicativos de estresse e correlação negativa com aspectos produtivos e reprodutivos. Representa uma ferramenta de fácil acesso através de estações climáticas, permitindo quantificar o nível de exposição e o impacto sobre a saúde animal. Neste contexto, estudos relatam a redução do desempenho reprodutivo durante os meses mais quentes, mesmo em regiões de clima subtropical. O presente estudo de metanálise, teve como objetivo comparar as taxas de prenhez de fêmeas leiteiras mestiças nas diferentes estações do ano na região da Zona da Mata Mineira. Para tanto, foi realizado um estudo observacional utilizando dados oriundos de propriedade leiteira comercial localizada na cidade de Mar de Espanha/MG. A coleta de dados de temperatura e umidade ambiental foi realizada pela base INMET – Instituto Nacional de Meteorologia. Foram avaliadas as condições climáticas no período de 2014 a 2022 e caracterizadas pelo cálculo do ITU. O menor ITU foi observado durante o inverno (61,5±3,9) enquanto o maior ocorreu no verão (68,4±3,6). A taxa de prenhez observada no inverno (59,9%) foi significativamente maior do que a observada no verão (48,6%). Quando comparado os ITUs médios entre vacas gestantes e não gestantes dentro de cada uma das estações, não foi observada diferença significativa, assim como não foi observada diferença no período de serviço para nenhuma estação do ano. Animais apresentando composição genética mais próxima de Bos taurus taurus (7/8 e 15/16) apresentaram maior redução da taxa de prenhez durante o verão quando comparados a animais com menor composição europeia (30,5% e 62,3%, respectivamente), denotando maior sensibilidade às condições climáticas. Conclui-se que as condições climáticas subtropicais durante o verão impactaram negativamente a taxa de prenhez de fêmeas bovinas mestiças na população estudada e que esse impacto ocorreu de forma mais intensa em animais apresentando maior composição genética europeia.pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectBovinoculturapt_BR
dc.subjectEstresse térmicopt_BR
dc.subjectReproduçãopt_BR
dc.subjectCattle raisingpt_BR
dc.subjectHeat stresspt_BR
dc.subjectReproductionpt_BR
dc.titleEfeito das estações do ano sobre a taxa de prenhez de fêmeas bovinas leiteiras mestiçaspt_BR
dc.title.alternativeEffect of the seasons on the pregnancy rate of crossbred dairy cowsen
dc.typeDissertaçãopt_BR
dc.description.abstractOtherThe presence of stressors stands out as one of the main elements correlated with the decrease in productive and reproductive performance in cattle. Thermal stress has been discussed as one of the main factors impacting livestock due to the increasing modification of climatic conditions in the world, in particular the increase in temperature. In dairy cows, heat stress has deleterious effects on several stages of reproductive development, decreasing the fertility of herds by different means. The temperature and humidity index (THI) has been widely used as an indicator capable of estimating the degree of thermal comfort in the production unit and because it has a positive correlation with physiological parameters indicative of stress and a negative correlation with productive and reproductive aspects. It represents an easily accessible tool through weather stations, allowing to quantify the level of exposure and the impact on animal health. In this context, studies report a reduction in reproductive performance during the warmer months, even in regions with a subtropical climate. This meta-analysis aimed to compare the pregnancy rates of crossbred dairy cows in different seasons of the year in the Zona da Mata Mineira region. For that, an observational study was carried out using data from a commercial dairy farm located in the city of Mar de Espanha/MG. The collection of environmental temperature and humidity data was carried out using the INMET base – Instituto Nacional de Meteorologia. The climatic conditions in the period from 2014 to 2022 were evaluated and characterized by the calculation of the THI. The lowest THI was observed during the winter (61.5±3.9) while the highest occurred in the summer (68.4±3.6). The pregnancy rate observed in winter (59.9%) was significantly higher than that observed in summer (48.6%). When comparing the average THIs between pregnant and non-pregnant cows within each of the seasons, no significant difference was observed, as well as no difference was observed in the period of service for any season of the year. Animals with a genetic composition closer to Bos taurus taurus (7/8 and 15/16) showed a greater reduction in pregnancy rate during the summer when compared to animals with a lower European composition (30.5% and 62.3%, respectively), denoting greater sensitivity to weather conditions. It is concluded that subtropical climatic conditions during the summer impacted the pregnancy rate of crossbred females in the studied population and that this impact occurred more intensely in animals with a higher European genetic composition.en
dc.contributor.advisor1Mello, Marco Roberto Bourg de-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-9790-4764pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/3560332978218414pt_BR
dc.contributor.referee1Mello, Marco Roberto Bourg de-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-9790-4764pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/3560332978218414pt_BR
dc.contributor.referee2Jesus, Vera Lucia Teixeira de-
dc.contributor.referee2Latteshttp://lattes.cnpq.br/6838386218159684pt_BR
dc.contributor.referee3Ferreira, Joaquim Esquerdo-
dc.contributor.referee3Latteshttp://lattes.cnpq.br/2145101630651788pt_BR
dc.creator.IDhttps://orcid.org/0000-0002-7570-768Xpt_BR
dc.creator.Latteshttp://lattes.cnpq.br/4663478634628906pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Veterináriapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Medicina Veterinária (Patologia e Ciências Clínicas)pt_BR
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