Methane emission of cattle fed Urochloa brizantha hay harvested at different stages.

dc.contributorCAROLINA 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.
dc.creatorNASCIMENTO, C. F. M. do
dc.creatorBERNDT, A.
dc.creatorROMERO, L. A.
dc.creatorMEYER, P. M.
dc.creatorFRIGHETTO, R. T. S.
dc.creatorDEMARCHI, J. J. A. de A.
dc.creatorRODRIGUES, P. H. M.
dc.date2016
dc.date2017-02-23
dc.date.accessioned2017-03-06T23:29:17Z
dc.date.available2017-03-06T23:29:17Z
dc.identifier1916-9752
dc.identifier23976
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/341572
dc.descriptionAbstract: 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.
dc.description2016
dc.languageen
dc.publisherJournal of Agricultural Science, Toronto, v. 8, n. 1 p. 163-174, 2016.
dc.relationEmbrapa Pecuária Sudeste - Artigo em periódico indexado (ALICE)
dc.subjectEnteric methane
dc.subjectMetabolic cage
dc.subjectShort-chain fatty acids
dc.subjectSulfur hexafluoride
dc.subjectTracer technique
dc.subjectGado de corte
dc.subjectFeno
dc.subjectMetano
dc.subjectNutrição animal
dc.subjectRuminação
dc.subjectFermentação
dc.subjectBeef cattle
dc.subjectMethane
dc.subjectSulfur hexafluoride
dc.subjectTracer techniques
dc.titleMethane emission of cattle fed Urochloa brizantha hay harvested at different stages.
dc.typeArtículos de revistas


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