Abstract

SLANAC, A.L.; DEFAGOT, E.  and  BALBUENA, O.. RUMINAL DEGRADABILITY OF DRY MATTER Spartina argentinensis HAY IN CATTLE. Compend. cienc. vet [online]. 2017, vol.7, n.2, pp.22-27. ISSN 2226-1761.  https://doi.org/10.18004/compend.cienc.vet.2017.07.02.22-27.

In order to evaluate the ruminal kinetics of the degradability dry matter of Spartina argentinensis hay in Parodi (Poaceae: Chloridaeae), samples of this material were taken in San Bernardo, Pozo Borrado, 9 de Julio Department, Santa Fe. At the Experimental Station INTA (Colonia Benítez, Chaco, Argentina), this plant material was dehydrated and then, according to the "in situ suspension" technique, it was introduced into the rumen of four steers zebu (3.5 years old, 420 kg weight), through ruminal cannula in the left flank. To estimate the digestion kinetics of dry matter (DM), the model proposed by Orskov and McDonald (1980) was used. The effective degradability was calculated according to the equation of the same authors. The degradation kinetics showed to be different between the cut of 15 days and those corresponding to 30 and 45 days of age, the observed difference from 24 to 72 hours of incubation. Analysis of variance showed significant statistic difference in the age cut (p= 0.011), but not for incubation differents hours (p= 0.175). It was concluded that rumen degradability of S. argentinensis hay dry matter, was greater in regrowth.

Keywords : ruminal degradability; at three cutting ages; hay; in situ; Spartina argentinensis; cattle.

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