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Respirometria e emissão de metano por ovinos alimentados com capim-elefante cortado com diferentes idades

Authors: Teixeira, Alex de Matos; Gonçalves, Lúcio Carlos; Velasco, Frederico Osório; Ribeiro Junior, Gabriel de Oliveira; Faria Júnior, Wilson Gonçalves; Cruz, Diego Soares Gonçalves; Jayme, Diogo Gonzaga;

Respirometria e emissão de metano por ovinos alimentados com capim-elefante cortado com diferentes idades

Abstract

Objetivou-se com este trabalho mensurar a respirometria e a emissão de metano entérico por ovinos alimentados com o capim-elefante cortado aos 56, 84 e 112 dias de crescimento. Foram utilizados 18 carneiros adultos sem raça definida, com peso médio de 34,7 ± 6 kg alojados em gaiolas de estudo de metabolismo. A mensuração dos gases foi realizada através de uma câmara respirométrica de fluxo aberto. O delineamento experimental utilizado foi inteiramente casualizado, com seis repetições, e as médias foram comparadas pelo teste SNK (P<0,05). Os animais alimentados com o capim colhido após 56 dias de rebrotação consumiram mais oxigênio e produziram mais dióxido de carbono e metano. As produções de calor variaram 87,19 a 143,57 Kcal/kg0,75/dia. O coeficiente respiratório foi semelhante entre os tratamentos, com valor médio de 0,98. A produção de metano variou entre 11,74 e 22,51 g/dia, havendo redução com o aumento da idade da planta forrageira. Quando expressa em g/kg0,75/dia, a produção deste gás foi superior para animais que receberam o capim-elefante-verde cortado aos 56 dias de idade (1,53 g/kg0,75/dia). A emissão de metano (g) por quilo de matéria seca (MS) e de fibra insolúvel em detergente neutro (FDN) consumido para o capim colhido mais novo (56 dias) foi superior à do capim colhido no estádio mais avanço de maturação (112 dias). Porém, as emissões de metano em gramas por quilo de MS digestível (27,2 g/kg) e FDN digestível (44,4 g/kg) foram semelhantes para os capins colhidos nas diferentes idades de corte. A emissão diária de metano (g/kg0,75/dia) foi maior em animais alimentados com a planta forrageira colhida mais nova, enquanto que se expressa em gramas por quilo de MS ou FDN digestível a emissão deste gás não sofreu influência do capim-elefante no momento do corte.

Keywords

calorimetria, ruminante, S, QH301-705.5, Agriculture, Biological Sciences, gás efeito estufa, Calorimetria, Gás efeito estufa, Biology (General), Ruminante

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    influence
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
6
Top 10%
Average
Average
Green
gold