Data/hora: 12/06/2024 13:06:55

Biblioteca(s): | Embrapa Pecuária Sudeste.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 2
Data corrente: | 16/11/2017
Data da última atualização: | 23/01/2018
Autoria: | KAHWAGE, P. R.; ESTEVES, S. N.; JACINTO, M. A. C.; BARIONI JUNIOR, W.; PEZZOPANE, J. R. M.; PANTOJA, M. H. de A.; BOSI, C.; MIGUEL, M. C. V.; MAHLMEISTER, K.; GARCIA, A. R.
Afiliação: | Priscila Reis Kahwage, UFPA; SERGIO NOVITA ESTEVES, CPPSE; MANUEL ANTONIO CHAGAS JACINTO, CPPSE; WALDOMIRO BARIONI JUNIOR, CPPSE; JOSE RICARDO MACEDO PEZZOPANE, CPPSE; Messy Hannear de Andrade Pantoja, UFPA; Cristian Bosi, Bolsista/Embrapa Pecuária Sudeste; Maria Carolina Villani Miguel, UNICEP; Kaue Mahlmeister, Bolsista/Embrapa Pecuária Sudeste; ALEXANDRE ROSSETTO GARCIA, CPPSE.
Título: | High systemic and testicular thermolytic efficiency during heat tolerance test reflects better semen quality in rams of tropical breeds.
Ano de publicação: | 2017
Fonte/Imprenta: | International Journal of Biometeorology, v. 61, p. 1819-1829, 2017.
DOI: | 10.1007/s00484-017-1367-4
Idioma: | Inglês
Conteúdo: | This study aimed to assess the capacity of Morada Nova (MN) and Santa Inês (SIN) rams to maintain body and testicular homeothermy under thermal challenge. For 5 days in the summer, 16 males (SIN = 7 and MN = 9) underwent a heat tolerance test, i.e., period 1?animals maintained in the shade (11 to 12 h); period 2?animals exposed to sunlight (12 to 13 h); and period 3?animals returned to the shade (13 to 14 h). The respiratory rate, heart rate, rectal temperature, and infrared surface temperatures (IRT) of the trunk, back, eyeball, and testicles were assessed in each period. The index of capacity of tolerance to insolation (ICTI), which indicates the animals? level of adaptability, was calculated for each animal. Semen quality and testicular parenchyma integrity were assessed before and after the thermal challenge. Statistical analyses were performed at 5% significance. In period 1, the variables had baseline values for both genotypes. In period 2, the variables involved in thermolysis significantly increased (P < 0.05), which matches a thermal discomfort situation. In period 3, the variables returned to baseline values and some values were lower than those in period 1. Semen quality and testicular parenchyma integrity suffered no negative effects with the thermal challenge. IRT ocular and IRT testicular were positively correlated (P < 0.05). It is concluded that MN and SIN rams had efficient thermolytic mechanisms that favor preserving gonadal functionality. The animals were considered resilient to a thermal challenge. In addition, infrared thermography was an efficient tool to verify body and testicular thermoregulation.
Palavras-Chave: | Infrared thermography.
Thesaurus Nal: | thermal stress; thermoregulation.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (24173-1) - UPC - AP - DD - PROCI-2017.00095 - KAH - 2017.00238 - DIS