Rumen degradability of a tropical grass hay in cattle grazing different pasture types

TL;DRAbstract

-1 ) of b, and t is the incubation time (h). The lag time before commencement of degradation of b was determined. It was not valid to test for significant differences between rumen fluid parameters as pastures were grazed sequentially and in different paddocks. The potential degradability of the tropical grass hay DM was lower (P < 0.001) when incubated in cattle grazing the high quality legume pasture, LP, than for all other pastures except LM and this effect was not correlated with rumen fluid pH (Table 1). Conditions within the rumen, other than pH, appeared to have had some effect on potential DM degradability which was not expected. The degradation rate of b did not differ between diets the despite the large range in rumen NH3-N concentrations across diets (16.7 – 382.3 mg/L). This result was unexpected given the findings of Panjaitan et al. (2006) for incubation of similar low quality tropical grass forages also with inherently low rates of degradation. However, our results concu

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