Effect of chemical composition of roughages on their degradation characteristics in the rumen and their relationship with the in vitro organic matter digestibility

Lopez, S.; Carro, D.; Gonzalez, J.S.; Carpintero, C.

Proceedings of the XVI International Grassland Congress, 4-11 October 1989, Nice, France: 935-936

1989


Accession: 002080562

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Abstract
The rumen degradability and in vitro OM digestibility of 35 roughage samples from a permanent meadow coming either from the June cut or from the Sep. regrowth and conserved in different forms was measured using the in sacco technique with sheep and 3, 6, 9, 15, 24, 48 and 72 h as incubation times and the conventional procedure, resp. The OM, CP, NDF, ADF, cellulose (C) and the lignin permanganate (L) contents of the samples ranged from 854 to 916, 107 to 161, 400 to 558, 242 to 347, 214 to 280 and 25 to 71 g/kg DM, resp. Taking into account that the potential rumen degradability (PRD) of the OM, CP and NDF was closely related to the OM, CP, NDF, ADF, C and L contents of the forages, prediction equations were developed. CP and ADF contents were the best predictors for both PRDOM and PRDNDF, while CP and L contents would be the best estimators for PRDCP. The in vitro OM digestibility was highly correlated with all the PRD's studied except for PRDCP.