Autor(es):
Cabral Menezes de Amorim, Mikael Leal ; Saraiva, Edilson Paes ; Carvalho Fonseca, Vinicius de Franca [UNESP] ; Guerra, Ricardo Romao ; Caetano Goncalves dos Santos, Severino Guilherme ; Melo Costa, Cintia Carol de [UNESP] ; Vieira Almeida, Maria Elivania ; Pinheiro, Antonio da Costa ; Pimenta Filho, Edgard Cavalcanti
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/194845
Origem: Oasisbr
Assunto(s): Cutaneous surface; Thermal insulation; Tropical climate; Phenotypic acclimatization; Cutaneous surface; Cutaneous surface; Thermal insulation; Thermal insulation; Tropical climate; Tropical climate; Phenotypic acclimatization; Phenotypic acclimatization
Descrição
Made available in DSpace on 2020-12-10T16:56:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-08-01
This study aims to address if are there annual changes in the hair coat traits and skin morphology of hair sheep breeds raised in an equatorial semi-arid region? Coat and skin samples were taken from thirty Morada Nova (4 +/- 2 years old; red coat; +/- SD) and twenty Santa Ines multiparous ewes (5 +/- 2 years old; brown and black coat; +/- SD) every 3 months over a year. Hair coat traits included thickness (mm), density (number of hairs cm(-2)), length (mm), and diameter (mm), plus epidermal and dermal thickness (mu m), sweat glands and blood capillaries area (mu m cm(-2)) were determined. Means of solar irradiance and ambient air temperature were higher between September and December. Annual changes (P < 0.05) in hair density, diameter, length and thickness, as well as the skin blood capillaries and sweat gland area differed between breeds. The modifications on hair coat traits resulted in minor changes on the effective thermal conductivity of the hair coat surface both for Morada Nova and Santa Ines sheep. Nevertheless, it was clearly evident that the overall cutaneous thermal insulation for Morada Nova sheep was lowest in September that was coupled with lower hair density, coat thickness, and higher sweat gland and blood capillary area (P < 0.05). In conclusion, even in an equatorial region, phenotypic acclimatization on morphological traits of cutaneous surface and skin traits can modify the overall thermal insulation of sheep breeds.
Univ Fed Paraiba, Anim Biometeorol & Ethol Grp BIOET, Areia, Brazil
Sao Paulo State Univ, Innovat Grp Anim Biometeorol INOBIO MANERA, Jaboticabal, Brazil
Univ Fed Paraiba, Dept Vet Sci, Areia, Brazil
Univ Witwatersrand, Sch Physiol, BFRG, Johannesburg, South Africa
Sao Paulo State Univ, Innovat Grp Anim Biometeorol INOBIO MANERA, Jaboticabal, Brazil
