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      Evaluación de vainas y hojas de árboles forrajeros por la técnica de producción de gas in vitro Translated title: In vitro gas production of leaves and pods of fodder trees from dry tropic using bovine faeces as inoculums

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          Abstract

          Se estudió la cinética de producción de gas in vitro para conocer el potencial nutricional de hojas de arbóreas y vainas que crecen en una zona tropical seca de México usando heces bovinas como inóculo, comparadas con el pasto guinea como referencia (Panicum maximum). Se colectaron hojas y vainas de: Prosopis laevigata, Pithecellobium dulce y Pithecellobium acatlense; y sólo hojas de: Amelanchier denticulata, Verbesiana crocata, Haemotoxylum brasiletto, Acacia bilimekii, Acacia pennatula, Acacia constricta y Lantana velutina. El inóculo se preparó con heces bovinas recién depuestas disueltas en agua en proporción 1:3. Se estimaron los parámetros de la velocidad máxima de producción de gas (v), la tasa de producción (s) y la fase lag (l). Tres especies mostraron bajos valores de gas (8,34-11,4 ml), mientras que la mayoría fueron cercanos a los del pasto guinea (29 ml) con una tasa de producción similar (0,03 h-1). Con excepción de la vaina de Pithecellobium acatlense, el resto tuvo mayor producción de gas (33,8-46,3 ml) que el pasto guinea (25,6 ml) con una tasa de producción igual o mayor (0,03 a 0,06 h-1). Los resultados indican que las vainas de Prosopis laevigata y Pithecellobium dulce tienen un valor nutricional superior al del pasto guinea mientras que las hojas de Haemotoxylum brasiletto y Prosopis laevigata presentaron un valor similar. La técnica de producción de gas in vitro permite estimar el valor potencial de recursos forrajeros no convencionales

          Translated 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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          Most cited references28

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          A semi-automated in vitro gas production technique for ruminant feedstuff evaluation

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            The effect of starch on forage fiber digestion kinetics in vitro.

            Purified corn and wheat starch were added to alfalfa, Coastal bermudagrass, fescue, and orchardgrass hays at 0, 40, 60, and 80% of the total as-fed substrate, and fiber digestion kinetics were determined in vitro. Kinetics were estimated by the model R = Doe-k(t-L) + U where R is residue remaining at time t, Do is digestible fraction, k is digestion rate constant, L is discrete lag time, and U is indigestible fraction. Parameters of the model were estimated by logarithmic transformation and a direct nonlinear least squares procedure. Corn and wheat starch did not differ in their effect upon lag time of fiber digestion, digestion rate, or potential extent of digestion. Alfalfa had a shorter lag time of fiber digestion (.86 h) than Coastal bermudagrass (3.05 h), but not than orchardgrass or fescue (1.66 and 2.42 h). Orchardgrass differed in fiber digestion rate (.0542h-1) from Coastal bermudagrass (.0698h-1) but not from alfalfa or fescue (.0670 and .0658h-1). The potential extent of fiber digestion was similar for fescue (75.8%) and orchardgrass (76.0%). The potential extent of fibre digestion for alfalfa (50.9%) differed from Coastal bermudagrass (64.3%), and both of these forages differed from fescue or orchardgrass. Addition of starch resulted in a linear increase in lag time of fiber digestion, but digestion rate was not affected. Potential extent of digestion was decreased when starch was added.
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              Influence of inoculum source in a gas production method

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                Author and article information

                Journal
                zt
                Zootecnia Tropical
                Zootecnia Trop.
                Instituto Nacional de Investigaciones Agricolas INIA, Maracay, Venezuela. (Maracay, Aragua, Venezuela )
                0798-7269
                September 2010
                : 28
                : 3
                : 421-426
                Affiliations
                [01] orgnameBenemérita Universidad Autónoma de Puebla orgdiv1Facultad de Medicina Veterinaria y Zootecnia México
                [02] orgnameUniversidad de Camagüey orgdiv1Facultad de Ciencias Agropecuarias Centro de Estudios para el Desarrollo de la Producción Animal Cuba
                [03] orgnameUniversidad Autónoma Metropolitana Unidad Xochimilco orgdiv1Departamento de Producción Agrícola y Animal México
                Article
                S0798-72692010000300013 S0798-7269(10)02800313
                44742015-33f1-401d-bf33-1a829b9c8adf

                http://creativecommons.org/licenses/by/4.0/

                History
                : 22 February 2010
                : 01 November 2010
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 27, Pages: 6
                Product

                SciELO Venezuela

                Categories
                Nota Técnica

                fodder trees,in vitro gas production,leaves,pods,inoculums,árboles forrajeros,producción de gas in vitro,hojas,vainas,inóculo

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