Abstract

SANTOS-BORGES, Bruno Rafael et al. Chemical composition of Pennisetum purpureum silages with inclusion of dehydrated Bixa orellana residue. Acta Agron. [online]. 2024, vol.73, n.1, pp.49-54.  Epub May 29, 2025. ISSN 0120-2812.  https://doi.org/10.15446/acag.v73n1.113673.

This study aimed to evaluate the fermentative characteristics and the chemical composition of Pennisetum purpureum cv. Roxo silages with addition of dehydrated Bixa orellana. A completely randomized design with four treatments (0, 15, 30, and 45 g kg-1) and five replicates was used. The variables analyzed were pH, ammoniacal nitrogen, effluent loss and dry matter recovery, and dry matter, crude protein, neutral detergent fiber, acid detergent fiber, and hemicellulose content. The data were subjected to analysis of variance and regression at a 5 % probability level (p < 0.05) using the statistical package SISVAR®. A linear increase of 0.0038 and 0.3305 percentage units was observed for each 1 g kg-1 of dehydrated annatto residue included, on pH and dry matter recovery. Ammoniacal nitrogen and effluent loss values reduced linearly by 0.0096 and 0.2473 percentage units. Each 1 g kg-1 of dehydrated annatto residue included in the Pennisetum purpureum silage promoted a linear increase of 0.4235, 0.1333, 0.5347, and 0.6450 percentage units in dry matter, crude protein, and neutral detergent fiber and hemicellulose, respectively. There was a reduction of 0.1107 percentage units in acid detergent fiber content. It was concluded that dehydrated annatto residue has the potential to serve as a silage moisture sequestrant for use in ruminant feed.

Keywords : Additive; agro-industrial coproduct; forage conservation; moisture sequestrant; qualitative characteristics.

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