Impacto do estresse térmico sobre a fisiologia, reprodução e produção de caprinos

Souza, Priscila Teixeira de; Salles, María Gorete Flores; Araújo, Aírton Alencar de

doi:10.1590/s0103-84782012005000072

Cited by 17 publications

(19 citation statements)

References 24 publications

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“…The elevation of RR in this study occurs as a response to increased temperature as a mechanism that animals use in order to dissipate the heat and maintain the homeothermy (MARTINS JUNIOR et al 2007). The maintenance of the high respiratory rate if maintained for several hours can result in serious problems for the animals such as reduction in food ingestion and rumination (SOUZA et al 2012), which did not happen in this study, since the average values of RR obtained at 5 p.m. were lower than those from 11 a.m. and 2 p.m. in all treatments, demonstrating the reduction of heat stress for the animals.…”

Section: Resultsmentioning

confidence: 54%

Physiological responses of caprines raised under different types of covering

Kawabata

Jesus²,

Silva³

et al. 2013

Eng. Agríc.

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Thermal discomfort inside facilities is one of the factors responsible for low productivity of caprines in the Brazilian Northeast region, because inadequate weather conditions can cause elevated rectal temperature, increased respiratory rate, decreased food ingestion and reduced production. The present paper aimed to study the behavior of physiological thermoregulation of the animals (respiratory rate -RR and rectal temperature -RT) at four different times of the day (8 a.m., 11 a.m., 2 p.m. and 5 p.m.) and their relation to bioclimatic indexes (Temperature Humidity Index -THI, Black Globe Humidity Index -BGHI and Radiant Heat Load -RHL) in order to determine whether the type of covering used in the animals facilities (ceramic covering -CC, asbestos cement covering -AC and straw covering -SC) interferes with the physiology of thermoregulation. The time of data collection was related to the values of environmental and physiological variables. At 2 p.m. it was found the highest values of Radiant Heat Load on the three types of covering. The values of RT and RR were higher at 11 a.m. and 2 p.m., and the straw tile provided better thermal conditions of microclimate for the animals. The increased RR maintained the caprines homeothermy.

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Section: Resultsmentioning

confidence: 54%

Physiological responses of caprines raised under different types of covering

Kawabata

Jesus²,

Silva³

et al. 2013

Eng. Agríc.

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“…A temperatura é um fator que interfere diretamente nas funções teciduais, visto que os processos químicos e físicos são sensíveis às suas variações, podendo levar a alterações fisiológicas, hematológicas, hormonais, reprodutivas e produtivas (Reece, 2006;Souza et al, 2012). A elevação brusca da temperatura corporal está associada com a desnaturação de proteínas, inativação de enzimas, suprimento insuficiente de oxigênio, alteração na estrutura das membranas, desnaturação celular, entre outros.…”

Section: Estresse Térmicounclassified

“…Fatores climáticos de regiões tropicais, tais como temperatura, umidade do ar e radiação solar interferem diretamente no desempenho reprodutivo dos animais, com destaque para os oriundos de regiões temperadas. Isto é agravado por práticas de manejo inadequadas, com destaque para falhas no conforto térmico de instalações (Perissinotto et al, 2009), do que resulta o estresse térmico que é revelado pela inabilidade produtiva do animal, possível degeneração testicular (Cunha et al, 2015) e mudanças no comportamento sexual (Souza et al, 2012). Em virtude da degeneração testicular, parâmetros espermáticos, como a concentração celular, são afetados (Silva et al, 2005), o que compromete a fertilidade masculina (Garcia, 2006).…”

Section: Principais Fatores Externos Como Causa Do Estresse Térmico Tunclassified

“…Contudo, estes são pouco adaptados às condições dos trópicos, onde frequentemente os fatores ambientais não compactuam com a amplitude ideal de conforto térmico, interferindo negativamente no desempenho dos mesmos (Façanha et al, 2013). Portanto, para aumentar a produtividade das criações nestas áreas, deve ser ressaltada a importância da utilização de animais mais adaptados ao clima (Souza et al, 2012).…”

Section: Principais Fatores Externos Como Causa Do Estresse Térmico Tunclassified

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Influência da temperatura sobre a função testicular

et al. 2018

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Influência da temperatura sobre a função testicular[Influence of temperature on testicular function] Resumo As células da linhagem germinativa são sensíveis a ação do calor, sendo a termorregulação um fator determinante para o sucesso reprodutivo. O aumento da temperatura testicular pode ocorrer devido a fatores internos ou externos e contribui para o aumento da produção de espécies reativas de oxigênio e nitrogênio, induzindo, assim, a degeneração testicular e perda de células germinativas. Em adição, mudanças nos níveis de testosterona e de corticosteroides em animais submetidos ao estresse térmico podem ser observadas e interferem na capacidade reprodutiva dos mesmos. Por outro lado, em resposta ao calor e com finalidade protetora, há o aumento da síntese de proteínas de choque térmico (HSP). Desta forma, a quantidade e qualidade do sêmen e, consequentemente, a fertilidade são comprometidas pelo estresse térmico testicular, o que torna a realização de estudos que aprofundem o conhecimento sobre as alterações causadas indispensáveis, inclusive para a busca de terapias que preservem e reparem as funções testiculares.Palavras-chave: estresse térmico; degeneração testicular; HSPs; ROS. AbstractGerm cells are sensitive to heat, thus thermoregulation is a determinant factor for reproductive success. The increase in testicular temperature can occur due to internal or external factors and contributes to the increased production of reactive oxygen and nitrogen species, which induces testicular degeneration and loss of germ cells. Furthermore, changes in testosterone and corticosteroid levels in animals submitted to heat shock can be observed and compromises the reproductive capacity. On the other hand, in response to heat, as a protection, an increase in synthesis of heat shock proteins (HSP) is observed. Therefore, the semen quantity and quality , consequently, the fertility are compromised by high temperatures, which makes necessary studies that furthers the knowledge on the changes caused, and that search for therapies that preserve and repair the testicular functions.

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“…Although tropical climate countries can contribute to this increase in food production, animal production in tropical regions may be influenced by thermal stress, which may hinder expression of the full potential of animal productivity (Souza et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Microclimate and thermal comfort indices in silvopastoral systems under different planting directions and seasons

Carvalho

Heid

Davide

et al. 2020

Rev. bras. eng. agríc. ambient.

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The orientation of tree-rows in a silvopastoral system associated with different seasons of the year allows more or less sunlight penetration, resulting in deliberate modification of the microclimate composition and thermal conditions provided to animals. In this sense, the aims of this study were to evaluate microclimatic variables and thermal comfort indices for east-west and north-south oriented silvopastoral systems, compared to unshaded systems during summer and winter. The study was conducted at the Modelo II Farm (21° 08’ S 53° 17’ W) at an altitude of 354 m. A randomized block design in scheme of split-split plots with five repetitions was adopted. Two planting directions and a control treatment (unshaded) were evaluated in the plots. Collection times were evaluated in sub-plots, and the distance from eucalyptus trees was evaluated in sub-sub-plots. Changes in the east-west and north-south planting directions did not promote changes in climate variables, nor did they change the thermal comfort indices during summer. There were differences, however, in temperature and relative humidity of the air, black globe temperature, and radiant heat load during winter. Silvopastoral systems provide improvements in the environment and, concomitantly, to the thermal comfort of animals, when compared to unshaded systems. However, thermal stress situations occur despite the presence of trees, depending on the time of the day and the distance from the rows of eucalyptus trees.

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Impacto do estresse térmico sobre a fisiologia, reprodução e produção de caprinos

Abstract: IImpacto do estresse térmico sobre a fisiologia, reprodução e produção de caprinos Impact of heat stress on the physiology, reproduction and production of goats

Cited by 17 publications

References 24 publications

Physiological responses of caprines raised under different types of covering

Physiological responses of caprines raised under different types of covering

Influência da temperatura sobre a função testicular

Microclimate and thermal comfort indices in silvopastoral systems under different planting directions and seasons

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