Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Leite, Jacinara Hody Gurgel Morais; Façanha, Débora Andréa Evangelista; Costa, Wirton Peixoto; Chaves, Dowglish Ferreira; Guilhermino, Magda Maria; Silva, Wallace Sostene Tavares; Asensio, Luis Alberto Bermejo

doi:10.1080/09712119.2017.1302877

Cited by 23 publications

(25 citation statements)

References 38 publications

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“…These results show the relatively high adaptability of the sheep to the climatic conditions of the Brazilian semiarid region and are similar to the findings of Rajab et al (1992), Sleiman and Abi Saab (1995), Quesada et al (2001), Al-Haidary (2004), McManus et al (2009), Castanheira et al (2010 and Leite et al (2017).…”

Section: Resultssupporting

confidence: 78%

“…The H DE values observed in this study were lower than those found by Leite et al (2017) The low C T favored thermolysis. The presence of a thin layer of hair is beneficial for thermolysis because it tends to prevent the movement of hot air.…”

Section: Resultscontrasting

confidence: 54%

“…The high H L during the hottest period (the dry season) was due to the higher H L of the white sheep (13.08 mm) in this season. During the rainy season, the H L decreased in both varieties (10.81 mm in the red ewes and 12.25 mm in the white ewes), favoring heat loss through the coat, as noted by Leite et al (2017). In the whitecoated animals, long hair was essential to protect the skin, decreasing the incidence of skin diseases.…”

Section: Resultsmentioning

confidence: 99%

“…However, this AT value was higher than the comfort level of 24 o C to 27 o C specified by Fuquay (1981). The high AT, especially in combination with the high RH (79.01%), may have hampered the effectiveness of the sweating and breathing mechanisms of evaporative thermolysis (SILVA, 2008;FAÇANHA et al, 2010;LEITE et al, 2017). Bezerra et al (2011) observed BGHI values ranging between 87.5 and 82.2 for the dry and rainy seasons, respectively, in a study also conducted in the Brazilian semiarid region.…”

Section: Resultsmentioning

confidence: 99%

“…These characteristics and efficient thermolysis are desirable in animals that live in hot climates such as that of the Brazilian semi-arid region. Such animals are considered to be well adapted to hot climates (FAÇANHA et al, 2010;LEITE et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Coat characteristics and physiological responses of locally adapted ewes in semiarid region of Brazil

Costa

Filho

Leite

et al. 2018

SCA

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This study aimed to evaluate the effects of heat stress and characterize the coat characteristics of red and white varieties of Morada Nova sheep raised in the semiarid region of Brazil during the rainy and dry seasons. The following variables were investigated: coat thickness (C T ), inclination angle of the coat (θ I ), hair coat density (H DE ), hair length (H L ) and hair diameter (H D ), in conjunction with the physiological responses of rectal temperature (RT) and respiratory rate (RR). The data were tested with an analysis of variance, a Tukey test at a 5% significance level and a correlation analysis. The season of the year (dry and rainy) and the variety (red and white) were used as fixed effects in the analysis of variance. H L , H DE and H D were significantly greater in the dry season than in the rainy season (P < 0.05), but C T and θ I did not differ between seasons (P > 0.05). H L , H DE and H D were lower and θ I was greater (P < 0.05) for the red variety, but C T was statistically equal (P > 0.05) for the two varieties. It was concluded that the coat characteristics of the Morada Nova ewes favor the adaptation of the sheep to a semiarid environment, including the improved protection of the skin against ultraviolet radiation. In general, the white variety presented characteristics reflecting a higher degree of adaptation to the conditions of the Brazilian semiarid region.

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Section: Resultssupporting

confidence: 78%

Section: Resultscontrasting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coat characteristics and physiological responses of locally adapted ewes in semiarid region of Brazil

Costa

Filho

Leite

et al. 2018

SCA

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Determination of haematological and biochemical parameters of Calf Saiga antelope (Saiga tatarica) living in the Gansu Endangered Animals Research Center

Liu

Mawolo

et al. 2020

Veterinary Medicine & Sci

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Background The Saiga antelope ( Saiga tatarica ) is native to Eurasia and is a member of the family Bovidae. Prior to 1920, the antelope had been extensively hunted for its horns, which were used in traditional Chinese medicine. Since 1920, the Saiga antelope has been protected because of this extensive hunting, which nearly led to its extinction. Objective The study evaluated haematological and biochemical parameters to provide references for the Calf Saiga antelope ( S. tatarica ). The study also sought to explore the mechanisms affecting these parameters in both genders of the Calf Saiga antelope. Methods Haematological and biochemical parameters were collected from the Calf Saiga antelope. Haematological and biochemical parameters were analysed by the Coulter counter and Automatic analyser, respectively. Results The average concentrations of female triglyceride levels showed significantly higher values than the significant concentrations of male. Female red blood cells and platelets concentrations were statistically significant than the significant concentrations of males. Magnesium female concentrations were also significantly higher than male values. Other parameters showed differences between males and females. Conclusion The reported results show that haematological and biochemical characteristics varied among Calf Saiga antelope and other animals. The study results suggest that regardless of the factors, breed, the breeding environment, and climatic variables, haematological and biochemical variations can be triggered that can result in a reduction in the heat production needed for maintenance of homeothermy.

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

Leite

Silva

et al. 2018

Int J Biometeorol

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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 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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Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Cited by 23 publications

References 38 publications

Coat characteristics and physiological responses of locally adapted ewes in semiarid region of Brazil

Coat characteristics and physiological responses of locally adapted ewes in semiarid region of Brazil

Determination of haematological and biochemical parameters of Calf Saiga antelope (Saiga tatarica) living in the Gansu Endangered Animals Research Center

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

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