Resumen

CABRAL JR., C. et al. Multivariate analysis of the epiphytic microflora on Saccharum Officinarum silages added with Gliricidia Sepium. Arch. zootec. [online]. 2009, vol.58, n.223, pp.395-404. ISSN 1885-4494.

The objective of this work was to evaluated the epiphytic micro flora of sugarcane (Saccharrum officinarum L.), fresh gliricidia (Gliricidia sepium) (GNE), wilted gliricidia (GE) and mixtures ensiled. This study was conducted at the Universidade Federal de Alagoas-UFAL, from January until December 2005. The experimental design was entirely randomized in outline [(2x3x4)+4)]. The sugarcane silages added with GNE or GE were maded in the referred percentages: 100/0; 75/25; 50/50 and 25/75. There were 28 treatments, each one with three replications. Silages were kept in experimental silos (plastic boxes), sealed with sailcloth and adhesive ribbon. These silos were maintained under controlled temperature, and humidity conditions and saved from rodent presence. The silos were opened at 15, 45, 90 and 120 days, and sampled. In relation to effects of factors and variables tested, the multivariate analysis showed significant differences (p<0.1). The microbiologic evaluation of silages was based in the two first principal components (Yi), which explained 83.09% of the total variation. The yeast, fungus and total bacteria, included in the Y1, explained 64.23%. The bacilli had less importance to explain the epiphytic micro flora variability of the silages, and were included in the Y2, explaining only 18.86% of the total variation. The 25% of wilted gliricidia may be an effective additive and it could be used with success to control undesirable secondary fermentation in sugarcane silages.

Palabras clave : Bacilli; Bacteria; Fungus; Yeasts.

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