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Thermoregulation of male sheep of indigenous or exotic breeds in a tropical environment

Pantoja, Messy Hannear de Andrade ; Esteves, Sérgio Novita ; Jacinto, Manuel Antonio Chagas ; Pezzopane, José Ricardo Macedo ; Paz, Cláudia Cristina Paro de ; Silva, Jamile Andréa Rodrigues da ; Lourenço Junior, José de Brito ; Brandão, Felipe Zandonadi ; Moura, Ana Beatriz Bossois ; Romanello, Narian ; Botta, Daniela ; Garcia, Alexandre Rossetto

Journal of thermal biology, 2017-10, Vol.69, p.302-310 [Periódico revisado por pares]

England: Elsevier Ltd

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Título:
Thermoregulation of male sheep of indigenous or exotic breeds in a tropical environment
Autor: Pantoja, Messy Hannear de Andrade ; Esteves, Sérgio Novita ; Jacinto, Manuel Antonio Chagas ; Pezzopane, José Ricardo Macedo ; Paz, Cláudia Cristina Paro de ; Silva, Jamile Andréa Rodrigues da ; Lourenço Junior, José de Brito ; Brandão, Felipe Zandonadi ; Moura, Ana Beatriz Bossois ; Romanello, Narian ; Botta, Daniela ; Garcia, Alexandre Rossetto
Assuntos: Animal care ; Animal welfare ; Animals ; Body Temperature ; Body Temperature Regulation ; Climate Change ; Genotypes ; Glands ; Heat stress ; Heat tolerance ; Heat-Shock Response ; Heatstroke ; Infrared thermography ; Male ; Ovis aries ; Physical characteristics ; Seasons ; Sheep ; Sheep - anatomy & histology ; Sheep - blood ; Sheep - physiology ; Skin ; Sweat ; Thermography ; Thermolysis ; Thermoregulation ; Thermotolerance ; Thyroid hormones ; Triiodothyronine ; Triiodothyronine - blood ; Tropical Climate ; Tropical environment ; Winter ; Wool
É parte de: Journal of thermal biology, 2017-10, Vol.69, p.302-310
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Climate change has intensified the frequency of heat waves in the world, thereby exposing farm animals to stressful conditions. For better productive performance it is important to identify the most resilient genotypes. Thus, our objective was to evaluate the thermoregulatory responses of rams of tropical indigenous (Morada Nova and Santa Inês) and exotic breeds (Dorper and Texel), by monitoring the environmental and physiological indicators related to heat tolerance. The experiment was carried out in a tropical climate region (Cwa), in Brazil, for twelve months, which comprised spring, summer, autumn and winter. Thirty-three rams were divided into groups: Morada Nova (MN; n=8, red-coat), Santa Inês (SI; n=9, black-coat), Dorper (DO; n=8, white-coat) and Texel (TX; n=8, white-coat). The microclimatic variables were monitored, and the THI and BGHI comfort indices were calculated. Coat thickness and body surface temperatures were measured monthly, and serum triiodothyronine-T3 measurements and complete blood tests were performed. The physiological variables were evaluated every fifteen days and skin micro-biopsies were performed in the summer and winter for histological evaluation. During the warmer seasons, the THI and BGHI reached values that indicated thermal discomfort. TX showed higher coat thickness throughout the year, increased physiological variables related to thermolysis, and reduced T3 (P < 0.05). The internal temperature was permanently lower in the MN, SI and DO (P < 0.05). The body surface temperatures were affected by the coat characteristics and wool length. Hematological parameters varied in the seasons with the highest thermal conditions (P < 0.05). The MN showed larger sweat glands, while the area occupied by the sweat glands was higher in the SI. The DO showed higher hair density in the summer and winter (P < 0.05). The results indicated that the MN, SI and DO breeds overcome the thermal challenge more easily throughout the seasons due to specific adaptive morphological and physiological characteristics. •The thermoregulatory capacity of rams was evaluated in a tropical climate.•Indigenous and exotic breeds were monitored.•Coat characteristics influence body surface temperature.•Indigenous breed showed morphological characteristics of sweat glands more favorable to thermoregulation.•The animals Morada Nova, Santa Inês and Dorper overcome the thermal challenge more easily.
Editor: England: Elsevier Ltd
Idioma: Inglês

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Thermoregulation of male sheep of indigenous or exotic breeds in a tropical environment

England: Elsevier Ltd

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