Estimación del consumo voluntario de kikuyo (Pennisetum clandestinum Hochst) y raigrás tetrelite (Lolium hybridum Hausskn)por bovinos en pastoreo mediante el uso de dos marcadores externos
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Instituto Colombiano Agropecuario - ICA
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En el Centro Nacional de Investigaciones Agropecuarias Tibaitatá, Instituto Colombiano Agropecuario (ICA), situado en la Sabana de Bogotá se efectuó un experimento para determinar el valor nutritivo. Ia excreción fecal y el consumo voluntario por bovinos en pastoreo de los pastos kikuyo (Petmise/um clandestinunn iloclist) de 42 y 56 las de rebrote y tetrelite (Lolium hvbrklum F-Iausskn) de 39 y 54 días de rebrote. Se utilizaron cómo marcadores el óxido de cromo (('1203) en el método de dosis continua y el cloruro de yterbio (Yb('I36H2 0) en el método de dosis única.
El valor nutritivo del pasto kikuyo fue mejor a Ia mayor edad de rebrote. En el pasto tetrelite, por el contrario, el mejor valor nutritivo fue para el rebrote de menor edad. Las estimaciones de Ia excreción fecal COO Cr203
fueron en promedio 85i mayores que las obtenidas con YbC13 (63,0 vs 34,1 g MS/kg P.V.0'75 /día); las del consumo lo fueron en promedio del 79 (165,8 vs 92,7 g M S/kg I>,V.°' /día). Las sobreestimaciones con Cr2 03 serían atribuibles a su incompleta recuperación La cual puede deberse a so forma de Suministro. Las excreciones fecales tendieron a ser más uniformes Ia dosificación única de 'YbCl1 lo que explicaría en mejor forma los cambios en el consumo atribuibles a Ia digestibilidad. Los consumos determinados con YhCI3 tienden a ser comparables con los valores de consumo de materia seca consignadas en el NRC
At Tibaitatá National Center of Agricultural Research of the lnstituto Colombiano Agropecuario (ICA), located on the Bogota savanna, an experiment was carried out to determine the nutritive value, the lecal output and the voluntary intake of kikuyu grass at 42 and 56 days of regrowth and tetrelite ryegrass at 39 and 54 days of regrowth using dairy cattle on 41 similar grazing conditions. The animals were dosed with a contjnous dose of chromic oxide (Cr2 03 ) eve. ry day during 7 days and with a pulse dose of yterhiumn chloride (Yh('I3 6112 0) as external markers. The nutritive value of kikuyu grass at 56 days of regrowth was higher than that at 42 days of rcgrowth. The tetrelite grass however showed a different pattern with higher values at 39 days of regrowtll. Tile fecal output using chromic oxide was 85 higher than the values obtained using v terbium cilloride (63.0 gkg W°'7 day vs 34.1 g/kg W°'75 /day). The dry matter intake was 79 higher with the chromic oxide than with the yterbiunl chloride (165.8 g/kg W1' 75/dIa vs 92,7/g/kg W°'75/day). The too lligll values obtained with chromic oxide could have been due to the incomplete recovery of the marker in the faeces and the way the marker was sup plied to the an ilIl als. However, the values obtained with Yh('I3 were more u ni form, showing that the change of dry matter intake can he better attributable to the dry matter digestibility changes.
Ganado de leche
Ganadería leche
At Tibaitatá National Center of Agricultural Research of the lnstituto Colombiano Agropecuario (ICA), located on the Bogota savanna, an experiment was carried out to determine the nutritive value, the lecal output and the voluntary intake of kikuyu grass at 42 and 56 days of regrowth and tetrelite ryegrass at 39 and 54 days of regrowth using dairy cattle on 41 similar grazing conditions. The animals were dosed with a contjnous dose of chromic oxide (Cr2 03 ) eve. ry day during 7 days and with a pulse dose of yterhiumn chloride (Yh('I3 6112 0) as external markers. The nutritive value of kikuyu grass at 56 days of regrowth was higher than that at 42 days of rcgrowth. The tetrelite grass however showed a different pattern with higher values at 39 days of regrowtll. Tile fecal output using chromic oxide was 85 higher than the values obtained using v terbium cilloride (63.0 gkg W°'7 day vs 34.1 g/kg W°'75 /day). The dry matter intake was 79 higher with the chromic oxide than with the yterbiunl chloride (165.8 g/kg W1' 75/dIa vs 92,7/g/kg W°'75/day). The too lligll values obtained with chromic oxide could have been due to the incomplete recovery of the marker in the faeces and the way the marker was sup plied to the an ilIl als. However, the values obtained with Yh('I3 were more u ni form, showing that the change of dry matter intake can he better attributable to the dry matter digestibility changes.
Ganado de leche
Ganadería leche
Palabras clave
Investigación agropecuaria - A50, Alimentación animal - L02, Ganado bovino, Consumo de alimentos, Valor nutritivo, Ganadería y especies menores