Autoria: FONTES, C. A. de A.; COSTA, V. A. C.; BERNDT, A.; FRIGHETTO, R. T. S.; VALENTE, T. N. P.; PROCESSI, E. F.

Resumo: Resumo: Objetivou-se avaliar o impacto da suplementação protéico-energética nas emissões de metano (CH4): diária, anual, por Mcal de energia líquida ingerida e por kg de ganho de peso vivo (PV) de novilhos, durante a recria, a pasto. Os tratamentos avaliados foram: TO - Apenas suplementação mineral; TI - Suplementação protéico-energética. Utilizou-se a técnica do gás traçador interno hexafluoreto de enxofre (SF6) para estimar a emissão diária de CH4. O experimento teve duração total de 160 dias. Foram utilizados 20 novilhos com peso inicial aproximado de 200 kg, sendo dez alocados aleatoriamente em cada tratamento. As emissões de CH4 foram avaliadas em dois ensaios, durante cinco dias consecutivos. Na análise estatística dos dados de emissão ele CH4 utilizou-se a metodologia de modelos mistos para medidas repetidas do SAS. Os animais suplementados tiveram maiores consumos diários de matéria seca (MS) e de energia líquida de mantença (ELm) (PO,O5) quanto à produção diária de CH4. Entretanto, os animais suplemetados emitiram menos CH4 (P Abstract: The objective was to evaluate the influence of protein-energy supplemenntation on the emissions of methano (CH4): daily, annual, per kg dry matter (DM) and per MCal maintenance energy (NEm) intake, and per kg live weight (LWT) gain, from growing steers, grazing Mombaça-grass. The treatments were: TO - Only mineral supplementation: TI - Protein-energy supplementation. The tracer SF6 gas methodology was used to estimate daily emissions of CH4. They were used 20 steers, from which ten were randomly allocated in each treatment. CH4 emissions were estimated over five consecutive days, in two trials. Mixed-model methodology for repeated data from SAS was used in statistical analysis of CH4 data. Supplemeted animals had higher (PO.O5) with respect to daily and annual CH4 emissions. However, supplemented animais showed lower (P<0.05)methane emission per MCal NEm intake and per kg LW gain than the non supplermented ones. It was concluded that supplementation effectively reduces CH4 emissions in beef cattle. Abstract: The objective was to evaluate the influence of protein-energy supplementation on the emissions of methane (CH4): daily, annual, per kg dry matter (DM) and per MCal maintenance energy (NEm) intake, and per kg live weight (LWT) gain, from growing steers, grazing Mombaça-grass. The treatments were: T0 - Only mineral supplementation; T1 - Protein-energy supplementation. The tracer SF6 gas methodology was used to estimate daily emissions of CH4. They were used 20 steers, from which ten were randomly allocated in each treatment. CH4 emissions were estimated over five consecutive days, in two trials. Mixed-model methodology for repeated data from SAS was used in statistical analysis of CH4 data. Supplemented animals had higher (P<0.05) DM and NEm intake and higher (P<0.05) LWT gain than non supplemented animals. The two treatments did not differ (P>0.05) with respect to daily and annual CH4 emissions. However, supplemented animals showed lower (P<0.05) methane emission per MCal NEm intake and per kg LW gain than the non supplemented ones. It was concluded that supplementation effectively reduces CH4 emissions in beef cattle.

Ano de publicação: 2011

Tipo de publicação: Artigo em anais e proceedings

Unidade: Embrapa Pecuária Sudeste

Palavras-chave: Bovines, Bovino, Consumo de matéria seca, Emissão de metano, Energia de mantença, Ganho de Peso, Metano, Methane production, Mitigaçâo de metano