Abstract

RODRIGUES, R.C. et al. In situ and in vitro degradation parameters of elephant grass silage with sugarcane bagasse. S. Afr. j. anim. sci. [online]. 2023, vol.53, n.3, pp.466-475. ISSN 2221-4062.  http://dx.doi.org/10.4314/sajas.v53i3.15.

The objective of this study was to evaluate the chemical composition and in situ degradability of elephant grass silage dry matter with increasing levels of sugarcane bagasse. A completely randomized design was adopted with five treatments: 0, 5, 10, 15, and 20% inclusion of sugarcane bagasse on an as-fed matter basis, with five replications, totalling 25 experimental units. The increasing proportion of sugarcane bagasse analysed was favourable only in increasing the concentration of dry matter and fibre of silages and in maintaining a considerable crude protein content. In the in situ degradation assay, the addition of sugarcane bagasse in silage decreased the ruminal degradability of dry matter, and as the passage rates increased, the effective degradability decreased. In the in vitro gas production assay, the total production of gases was decreased with the inclusion of sugarcane bagasse, as did the degradability of organic matter and neutral detergent fibre. The recommendation for the inclusion of sugarcane bagasse should be analysed according to the desired objective, emphasizing that values higher than 5% can greatly compromise the final nutritive value of elephant grass silage.

Keywords : conservation of forage; by-product; in vitro gas production; methane production; nutritional value.

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