Título:	Effect of seasons on enteric methane emissions from cattle grazing Urochloa brizantha.
Autoria:	DEMARCHI, J. J. A. de A. MANELLA, M. Q. PRIMAVESI, O. M. A. S. P. R. FRIGHETTO, R. T. S. ROMERO, L. A. BERNDT, A. LIMA, M. A. de
Afiliação:	JOÃO JOSÉ ASSUMPÇÃO DE ABREU DEMARCHI, IZ - Nova Odessa; MARCELO DE QUEIROZ MANELLA, Phibro Animal Health; ODO M A S P R PRIMAVESI; ROSA TOYOKO SHIRAISHI FRIGHETTO, CNPMA; LAURA ALEXANDRA ROMERO, FMVZ-USP; ALEXANDRE BERNDT, CPPSE; MAGDA APARECIDA DE LIMA, CNPMA.
Ano de publicação:	2016
Referência:	Journal of Agricultural Science, Toronto, v. 8, n. 4, p. 106-115, 2016.
Conteúdo:	Abstract: The objective of this study was to evaluate the effect of seasons under a tropical climate on forage quality, aswell the effect of an Urochloa brizantha cv. Marandu grazing system on enteric methane (CH4) emissions fromNellore cattle in the Southeast region of Brazil. Sixteen Nellore steers (18 months old and initial weight 318.0 ± 116.59 kg of LW; final weight 469 ± 98.50 kg of LW) were used for a trial period of 10 months, with four collection periods in winter (August), spring (December), summer (February) and autumn (May). Each collection period consisted of 28 days, corresponding to the representative month of each season where the last six days were designed for methane data collection. Animals were randomly distributed within 16 experimental plots, distributed in four random blocks over four trial periods. CH4 emissions were determined using the sulphur hexafluoride (SF6) tracer gas technique measured by gas chromatography and fluxes of CH4 calculated. The forage quality was characterized by higher CP and IVDMD and lower lignin contents in spring, differing specially from winter forage. Average CH4 emissions were between 102.49 and 220.91 g d-1 (37.4 to 80.6 kg ani-1 yr-1); 16.89 and 30.20 g kg-1 DMI; 1.35 and 2.90 Mcal ani-1 d-1; 0.18 and 0.57 g kg-1 ADG-1 and 5.05 and 8.76% of GE. Emissions in terms of CO2 equivalents were between 4.68 and 14.22 g CO2-eq-1 g-1 ADG. Variations in CH4 emissions were related to seasonal effect on the forage quality and variations in dry matter intake.
Thesagro:	Fermentação Gado de corte Metano Nutrição animal Ruminação Gramínea forrageira
NAL Thesaurus:	Urochloa brizantha Methane Nellore Beef cattle Gas emissions Sulfur hexafluoride
Palavras-chave:	CO2-eq Enteric methane Nelore
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPMA)