Data/hora: 11/06/2024 21:01:24

Biblioteca(s): | Embrapa Gado de Leite.
Data corrente: | 17/02/2016
Data da última atualização: | 03/02/2024
Autoria: | ALFONZO, E. P.; SILVA, M. V. G. B.; SANTOS, D. D. dos; STUMPF, M. T.; DALCIN, V. C.; KOLLING, G.; FISCHER, V.; McMANUS, C. M.
Afiliação: | E. P. ALFONZO, UFRGS; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL; Daltro D. dos Santos, UFRGS; M. T. STUMPF, UFRGS; V. C. DALCIN, UFRGS; G. KOLLING, UFRGS; V. FISCHER, UFRGS; M. C. McMANUS, UFRGS; UnB.
Título: | Relationship between physical attributes and heat stress in dairy cattle from different genetic groups.
Ano de publicação: | 2015
Fonte/Imprenta: | International Journal of Biometeorology, v. 60, n. 2, p. 245-353, 2015.
Idioma: | Inglês
Conteúdo: | Dairy cattle raised under harsh conditions have to adapt and prevent heat stress. The aim of this study was to evaluate physical characteristics and their association with heat tolerance in different genetic groups of dairy cattle. Thickness of the skin and coat, length and number of hairs, body measurements, as well as physiological parameters and body temperatures by infrared thermography were determined in 19 Holstein and 19 Girolando (½ and ¾ Holstein) cows. The Holstein cattle were less tolerant to heat stress than Girolando (GH50 and GH75 Holstein), because of the difficulty in dissipating heat due to the larger body size, as well as thicker and longer hairs. The correlations between physical characteristics, physiological parameters, and thermographic measurements prove to be inconsistent among genetic groups and therefore are not predictive of heat tolerance, while the regressions of morphometric characteristics on physiological and thermographic measures were not significant. Thus, the physical characteristics were not good predictors of physiological indices and thermographic temperature and so should not be used.
Palavras-Chave: | Coat and cows; Tolerance.
Thesaurus Nal: | thermography.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/139252/1/Cnpgl-2015-IntJBiom-Relationship.pdf
Registro original: | Embrapa Gado de Leite (CNPGL)
Exemplares: | CNPGL - (22368-1) - UPC - AP - DD -  -  -  - DIS