Effect of replacement of sugarcane by oilseed press cakes in greenhouse gases and volatile fatty acids production in vitro/Efeito da substituicao de cana-de-acucar por tortas oleaginosas sobre a producao in vitro de gases do efeito estufa e acidos graxos volateis

• Published in: Acta scientiarum. Animal sciences 2016-07, Vol.38 (3), p.293
• Main Authors: Moreira, Milenna Nunes, Silva, Aderbal Marcos de Azevedo, Bezerra, Leilson Rocha, Carneiro, Heloisa, Morais, Raissa Kiara de Oliveira, de Medeiros, Fabiola Franklin
• Format: Article
• Language: Spanish
• Subjects: Air pollution; Carbon dioxide; Cattle feed; Esters; Fatty acids; Greenhouse gases; Methane; Natural gas; Rumen; Sugarcane
• ISSN: 1806-2636
• DOI: 10.4025/actascianimsci.v38i3.31598

This study aimed to evaluate the production of methane, carbon dioxide, and volatile fatty acids and changes in ruminal pH in vitro with oilseed press cakes inclusion, such as, cottonseed, sunflower, castor bean, moringa and jatropha at four different levels (0, 30, 50 and 70%) in replacement to the sugarcane in ruminant feeding using semi-automated in vitro technique. The byproduct that produced less C[O.sub.2] was cottonseed cake (p = 0.0059). The cakes that produced the least amount of C[H.sub.4] were moringa at 70% (p < 0.05) and cottonseed at 70% levels (p < 0.0001). The cakes that had the highest increases in VFAs were cottonseed and castor (p < 0.0001). Additionally, greater pH was moringa at 70% and cottonseed at 50% levels (p < 0.0001). The greater acetate concentration was 70% cottonseed cake, propionate concentration with 30% cottonseed and butyrate concentration with 50% moringa in sugarcane replace. At the 70% level, the moringa cake displayed the highest decreases in methane production and reduction in energy loss. At the 50% substitution level, the cottonseed cake is the most suitable replacement for sugarcane in order to reduce the production of greenhouse gases. Keywords: acetate, butyrate, N-N[H.sub.3], propionate, VFAs. Objetivou-se avaliar a producao de metano, dioxido de carbono, acidos graxos volateis e mudancas no pH ruminal in vitro com tortas de oleaginosas: algodao, girassol, mamona, moringa e pinhao manso incluidas em quatro niveis diferentes (0, 30, 50 e 70%) em substituicao a cana-de-agucar na dieta de ruminantes, utilizando-se a tecnica semiautomatica in vitro. O subproduto que produziu menos C[O.sub.2] foi o algodao (p = 0,0059). As tortas de oleaginosas que produziram menos C[H.sub.4] foram moringa (p < 0,05) e algodao (p < 0,0001) a 70% de inclusao. As tortas que aumentaram a producao de AGVs foram algodao e mamona (p < 0,0001). Alem disso, o pH aumentou nos niveis de inclusao a 70% de moringa e 50% de algodao (p < 0,0001). A maior concentracao de acetato ocorreu na torta de algodao a 70%, ja o propionato na torta de algodao a 30% e a maior concentracao de butirato na torta de moringa a 50% em substituicao a cana-de-agucar. Em nivel de 70%, a torta de moringa apresentou maior reducao no metano e na energia alimentar. Em nivel de substituicao de 50%, a torta de algodao foi a substituicao mais adequada para a cana- de-agucar, a fim de reduzir a producao de gases com efeito de estufa. Palavras-chave: acetato, butyrato, N[H.sub