Data/hora: 23/09/2024 23:14:42

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	08/01/2020	
Data da última atualização: 	06/02/2024	
Autoria: 	ORNELAS, L. T. C.; SILVA, D. C.; TOMICH, T. R.; CAMPOS, M. M.; MACHADO, F. S.; FERREIRA, A. L.; MAURICIO, R. M.; PEREIRA, L. G. R.	
Afiliação: 	L.T.C. Ornelas; D.C. Silva; THIERRY RIBEIRO TOMICH, CNPGL; MARIANA MAGALHAES CAMPOS, CNPGL; FERNANDA SAMARINI MACHADO, CNPGL; A.L. Ferreira; R.M. Maurício; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL.	
Título: 	Differences in methane production, yield and intensity and its effects on metabolism of dairy heifers.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Science of The Total Environment, v. 689, p. 1133-1140, 2019.	
DOI: 	https://doi.org/10.1016/j.scitotenv.2019.06.489	
Idioma: 	Inglês	
Conteúdo: 	The effects of divergent phenotypic classification in crossbreed Holstein × Gyr dairy heifers for methane emissions in relation to performance, digestibility, energy and nitrogen partition, blood metabolites and temperature of body surface were evaluated. Thirty-five heifers were classified as high and low emission for CH4 production (g/day), yield (g/kg dry matter intake) and intensity (g/kg average daily gain). Digestibility was evaluated by total collection of feces and urine. Gas exchanges were obtained in open-circuit respiratory chambers. A completely randomized design was used and divergent groups were compared by Fisher's test. No differences were found in intake traits between groups of CH4 production and intensity. The low yield group had higher intake. For digestibility and temperature at different body sites were no differences between variables. High production group had higher energy losses as methane and heat production. Low intensity group had higher digestible energy, energy balance and ratio between metabolizable and digestible energy. Urinary nitrogen was 14.3% lower for low production group. There was a difference between methane yield divergent groups for nitrogen intake, digestible and retained. Energy and nitrogen partitioning traits are correlated to the animals divergent for methane production and yield. The low production group presented lower blood insulin concentration. It was not possible to identify divergent animals for CH4 emission using the infrared thermography technique.	
Palavras-Chave: 	Greenhouse gas; Nitrogen utilization; Respiration assay.	
Thesaurus Nal: 	Calorimetry; Climate change.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (24951-1) - UPC - AP - DD -  -  -  - DIS