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Evaluación de vainas y hojas de árboles forrajeros por la técnica de producción de gas in vitro

Keywords: fodder trees, in vitro gas production, leaves, pods, inoculums.

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Abstract:

the kinetics of in vitro gas production to achnowledge the nutritional potential of tree leaves and pods that grow in a dry tropical area of mexico using bovine faeces as inoculum, compared with guinea grass (panicum maximum) as reference was studied. leaves and pods were collected from: prosopis laevigata, pithecellobium dulce and pithecellobium acatlense; and only leaves from: amelanchier denticulata, verbesiana crocata, haemotoxylum brasiletto, acacia bilimekii, acacia pennatula, acacia constricta and lantana velutina. the inoculums were prepared with fresh bovine faeces dissolved in water in 1:3 ratio. parameters estimated were the maximum gas production (v), the production rate (s) and the lag phase (l). three species showed low gas values (8,34-11,4 ml) while most were close to those of guinea grass (29 ml) with a similar production rate (0,03 h-1). in the pods, with exception of pithecellobium acatlense, the others presented a higher gas production (33,8-46,3 ml) than guinea grass (25,6 ml) with a rate of production similar o greater (0,03 a 0,06 h-1). the results indicate that the pods of prosopis laevigata and pithecellobium dulce have nutritional value superior to that of guinea grass while leaves from haemotoxylum brasiletto and prosopis laevigata have a similar value. the gas production technique in vitro allows the estimation of the potential value of non-conventional feed resources

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