Data/hora: 21/09/2024 17:55:55

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	22/08/2017	
Data da última atualização: 	22/08/2017	
Autoria: 	LEITE, J. H. G. M.; FAÇANHA, D. A. E.; COSTA, W. P.; CHAVES, D. F.; GUILHERMINO, M. M.; SILVA, W. S. T.; BERMEJO, L. A.	
Afiliação: 	Jacinara Hody Gurgel Morais Leite, Universidade Federal Rural do Semiárido (UFERSA) - Mossoró, RN, Brazil; Débora Andréa Evangelista Façanha, State University of Ceará (UFC) - Fortaleza, Ceará, Brazil; Wirton Peixoto Costa; Dowglish Ferreira Chaves; Magda Maria Guilhermino, Universidade Federal do Rio Grande do Norte (UFRN) - Natal, RN, Brazil; Wallace Sostene Tavares Silva; Luis Alberto Bermejo, Universidad de La Laguna - Santa Cruz de Tenerife, Canary Islands, Spain.	
Título: 	Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Journal of Applied Animal Research,	
DOI: 	http://dx.doi.org/10.1080/09712119.2017.1302877	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Semi-arid conditions can adversely affect livestock productivity and change certain physiological parameters. The relationship between hair coat and thyroxine levels in Morada Nova ewes was evaluated through environmental factors, such as air temperature, relative air humidity, radiant and Black Globe Humidity Index to gain a better understanding of thermoregulation mechanisms in these animals. Measurements were taken from July to January in 383 Morada Nova ewes. The variables studied included rectal temperature (RT), respiratory rate (RR), coat thickness (CT), hair length (HL), hair diameter (HD), hair density (D) and thyroid hormones. The data underwent multivariate statistical analyses and a significant inverse relationship was found between coat traits and Thyroxine (T4). The animals that exhibited greater HL, coat density and CT showed lower T4 concentrations. Coat traits showed a strong interaction with physiological mechanisms and can be considered relevant in maintaining homeostasis. Hair traits play an important role in this process, since T4 reduction was stronger in animals that showed difficulties in eliminating heat, which were the ones that had greater HL, hair density and HD. By contrast, animals with a hair coat more favourable to heat losses had higher levels of thyroid hormones.	
Thesaurus Nal: 	Sheep.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)