期刊
INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
卷 62, 期 9, 页码 1635-1644出版社
SPRINGER
DOI: 10.1007/s00484-018-1563-x
关键词
Adaptation; Cutaneous evaporation; Equatorial semiarid; Homeothermy; Naturalized breed; Thermoregulatory mechanisms
资金
- Capes - Ciencia sem Fronteiras Program - Visiting Researcher project [88881030352/2013-1]
- EMBRAPA - Goat and Sheep
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 R-R 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.
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