Data/hora: 16/06/2024 10:08:26

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	23/02/2017	
Data da última atualização: 	07/11/2018	
Autoria: 	NASCIMENTO, C. F. M. do; BERNDT, A.; ROMERO, L. A.; MEYER, P. M.; FRIGHETTO, R. T. S.; DEMARCHI, J. J. A. de A.; RODRIGUES, P. H. M.	
Afiliação: 	CAROLINA FERNANDA MOYSES DO NASCIMENTO, FMVZ-USP; ALEXANDRE BERNDT, CPPSE; LAURA ALEXANDRA ROMERO, FMVZ-USP; PAULA MARQUES MEYER, IBGE; ROSA TOYOKO SHIRAISHI FRIGHETTO, CNPMA; JOÃO JOSÉ ASSUMPÇÃO DE ABREU DEMARCHI, IZ Nova Odessa; PAULO HENRIQUE MAZZA RODRIGUES, FMVZ-USP.	
Título: 	Methane emission of cattle fed Urochloa brizantha hay harvested at different stages.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Journal of Agricultural Science, Toronto, v. 8, n. 1 p. 163-174, 2016.	
ISSN: 	1916-9752	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The objective of this trial was to assess the methane emission rate, as well as the digestibility and ruminal fermentation parameters in animals fed Urochloa brizantha hay harvested at different stages of growth. Six Nellore rumen-cannulated steers (402.0 ± 51.62 kg) were assigned to a replicated 3×3 Latin square (18 experimental units). Treatments differed according to three growth stages of the forage: 15 - hay with 15 days of growth, 45 - hay with 45 days of growth and 90 - hay with 90 days of growth. Each experimental period lasted 21 days. From the 8th day, feces were sampled during 5 days to determine apparent total digestibility of dry matter and its fractions. Beginning on the 13th day and running for 7 days, methane production was evaluated using the sulfur hexafluoride (SF6) tracer technique. On the 20th day, ruminal fluid was sampled prior to and after 2, 4, 6, 8 and 10 hours post-morning feeding for evaluating pH, ammonia-N and short-chain fatty acids (SCFA). As the stage of forage growth for harvesting advanced in days, the digestibility coefficient of crude protein decreased and non-fibrous carbohydrate values increased. Methane production was affected not only by the stage of forage growth, but also by quality of its conservation after harvesting. There were significant differences among treatments when methane was expressed in g kg-1 DMI, g kg-1 OMI, % GE and % DE, with non-linear effect. The stage of forage growth did not influence ruminal pH, total concentration or molar proportion of SCFA, but decreased NH3-N concentration.	
Palavras-Chave: 	Enteric methane; Metabolic cage; Short-chain fatty acids; Tracer technique.	
Thesagro: 	Feno; Fermentação; Gado de corte; Metano; Nutrição animal; Ruminação.	
Thesaurus Nal: 	Beef cattle; Methane; sulfur hexafluoride; Tracer techniques.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (23976-1) - UPC - AP - DD - PROCI-2016.00202 - NAS - 2017.00058 - DIS