DIGESTIBILIDAD DE LA CELULOSA EN FORRAJERAS NATIVAS POR FIBROBACTER SUCCINOGENES AISLADO DESDE EL RUMEN DE CABRAS BIOTIPO CRIOLLO

GRILLI, D.; PAEZ, S.; EGEA, V.; CERÓN, M.; COBOS, E. ; ALLEGRETTI, L.; ARENAS, GN.

Mendoza

Jornada; XXVIII Reunión Científica Anual de la Sociedad de Biología de Cuyo.; 2010

Sociedad de Biología de Cuyo

Fibrobacter succinogenes is a major cellulolytic bacterium in the rumen of cattle and sheep. The assignation of the role of the bacterial strain in its natural environment depends on the substrate that it can digest. The aim of this study was to determine in vitro digestibility of the cellulose in the alfalfa and six native forage for one strain of F succinogenes. The same was isolated from goats biotype Criollo grazing native pasture in the northeast of the province of Mendoza and was identified by PCR. The substrates evaluated were Medicago sativa, Prosopis flexuosa Capparis atamisquea, Geoffroea decorticans, Mimosa ephedroides, Tricomaria usillo and Atriplex lampa. The percentages of in vitro digestibility of the cellulose in these forages were 19.10 ± 4.72, 19.48 ± 1.71, 36.76 ± 7.28, 31.22 ± 4.22, 29.49 ± 9.26, 38.23 ± 0.65 y 50.36 ± 4.49%, respectively. The correlation coefficient (R= 0.79, p <0.05) between the lignin content of forages evaluated and the percentage digestibility of the cellulose in these forages suggests that no lignified tissues are much more degraded than lignified tissues of forages evaluated. Knowledge of in vitro digestibility of rumen bacteria is essential for developing strategies to manipulate the rumen fermentation, aimed at improving efficiency in the production of goats in arid systems.