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Locally adapted Brazilian ewes with different coat colors maintain homeothermy during the year in an equatorial semiarid environment

  • Jacinara Hody Gurgel Morais Leite
  • Roberto Gomes Da Silva
  • Wallace Sostene Tavares da Silva
  • Wilma Emanuela da Silva
  • Renato Diógenes Macedo Paiva
  • José Ernandes Rufino Sousa
  • Luis Alberto Bermejo Asensio
  • Débora Andrea Evangelista Façanha
Original Paper

Abstract

The present paper aimed to show the thermoregulatory responses of locally adapted Morada Nova sheep with different coat colors that were exposed to direct solar radiation in an equatorial semiarid region. Animals were classified into four groups according to the coat color as follows: (1) dark red, (2) intermediate red, (3) light red, and (4) white coats. Forty Morada Nova ewes were observed in for 7 consecutive months. The experimental variables measured were rectal temperature (RT), skin surface temperature (ST), respiratory rate (RR), skin surface evaporation (CE), respiratory evaporation (RE), and heat exchange by convection (HC) and radiation (R). Data were collected from 1100 to 1400 h after the animals were exposed to 30 min direct sunlight. The results showed that all groups maintained homeothermy. The RR was higher in the animals of groups 1 to 3, which also showed higher values for ST when compared to the white-coated animals. Sensible heat exchange mechanisms were not important for heat loss, and R was a significant source of heat gain from the environment for the animals. Groups 1, 2, and 3 used RR more intensely than group 4 (P value = 0.001); however, CE was higher for the white-coated animals. It was concluded that Morada Nova sheep are well adapted to the semiarid environment, regardless of coat color.

Keywords

Adaptation Cutaneous evaporation Equatorial semiarid Homeothermy Naturalized breed Thermoregulatory mechanisms 

Notes

Acknowledgments

The authors acknowledge EMBRAPA - Goat and Sheep and Capes - Ciência sem Fronteiras Program - Visiting Researcher project (process number n° 88881030352/2013-1) for the financial support.

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Copyright information

© ISB 2018

Authors and Affiliations

  • Jacinara Hody Gurgel Morais Leite
    • 1
  • Roberto Gomes Da Silva
    • 2
  • Wallace Sostene Tavares da Silva
    • 1
  • Wilma Emanuela da Silva
    • 1
  • Renato Diógenes Macedo Paiva
    • 1
  • José Ernandes Rufino Sousa
    • 1
  • Luis Alberto Bermejo Asensio
    • 3
  • Débora Andrea Evangelista Façanha
    • 1
  1. 1.Universidade Federal Rural do Semi-AridoUFERSAMossoróBrazil
  2. 2.Universidade Estadual PaulistaUNESPSão PauloBrazil
  3. 3.Universidad de La LagunaSanta Cruz de TenerifeSpain

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