Heat loss efficiency and HSPs gene expression of Nellore cows in tropical climate conditions

Autor(es):Mostrar menos -

Hooper, Henrique Barbosa ^[1] ; Titto, Cristiane Goncalves ^[1] ; Gonella-Diaza, Angela Maria ^[2] ; Henrique, Fabio Luis ^[1] ; Pulido-Rodriguez, Lina Fernanda ^[1] ; Silva Longo, Ana Luisa ^[1] ; da Cunha Leme-dos-Santos, Thays Mayra ^[1] ; Pereira de Mira Geraldo, Ana Carina Alves ^[3] ; Franco Pereira, Alfredo Manuel ^[3] ; Binelli, Mario ^[2] ; de Carvalho Balieiro, Julio Cesar ^[2] ; Lencioni Titto, Evaldo Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Anim Sci, Duque Caxias Norte Ave 225, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Sao Paulo, Fac Vet Med & Anim Sci, Duque Caxias Norte Ave 225, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Evora, Inst Mediterranean Agr & Environm Sci, Biometeorol & Anim Welf Lab, Apartado 94, P-7006554 Evora - Portugal

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF BIOMETEOROLOGY; v. 63, n. 11, SI, p. 1475-1486, NOV 2019.
• Citações Web of Science: 2

Resumo

Adaptation is a relevant characteristic to be understood in livestock animals in order to maintain and raise productivity. In Brazil, the Nellore beef cattle are widely disseminated and well-adapted breed that present good thermoregulatory characteristics for tropical environment conditions. Conversely, the physiological and cellular mechanisms required for thermoregulation and thermotolerance in this breed are still limited. The aim of this study was to comprehend the heat loss efficiency at the whole animal level and heat shock response at the cellular level of Nellore cows in tropical climate conditions. Healthy purebred Nellore cows were classified according to their capacity to lose body heat as Efficient or Inefficient based on vaginal temperature which was continuously monitored by data-loggers. Rectal, tail, and ocular temperatures, sweating rate, and respiratory frequency were collected to assess other thermoregulatory responses. Peripheral mononuclear cells were used for gene expression of heat shock proteins 60, 70, and 90 induced by in vitro heat treatments at 38, 40, and 42 degrees C. In our findings, the Efficient cows presented higher sweating rates compared to Inefficient cows that presented higher rectal temperature with greater amplitude of vaginal temperature profile. Transcription of the HSP genes was stable at 38 and 40 degrees C and decreased for all HSP genes at 42 degrees C. In conclusion, the Nellore efficiency to lose heat was mainly associated with their sweating capacity and cellular thermotolerance confirmed by the maintenance of heat shock proteins transcripts under heat stress. Taken together, this knowledge contributes as a future key for genetic selection of adapted animals. (AU)

• Processo FAPESP: 11/09282-3 - Termotolerância em fêmeas bovinas: abordagens celular e fisiológica
• Beneficiário: Evaldo Antonio Lencioni Titto
• Modalidade de apoio: Auxílio à Pesquisa - Regular