Composição bromatológica e padrão fermentativo de silagem de capim- elefante CV roxo sob níveis de inclusão de casca de maracujá e tempos de emurchecimento

Abstract

The present study aimed at determining the chemical composition and fermentation profile of elephant grass silage cv. “roxo” with different levels of passion fruit peel (PFP) inclusion and different wilting times. Five levels of passion fruit peel inclusion (0%, 25%, 50%, 75% e 100%) were evaluated for each wilting time (0, 4, 6, e 8h) in a completely randomized design, with three replications. The dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin (LIG), neutral detergent insoluble nitrogen (NIDN), acid detergent insoluble nitrogen (ADIN), total carbohydrates (CHOt), non-fiber carbohydrates (NFC), mineral matter (MM), ether extract (EE), pH, ammoniac nitrogen (N-NH3) and total losses (TL) of the silages were determined. Passion fruit peel inclusions influenced all studied variables. The same was observed for the wilting times, except for EE variable. The inclusion of PFP decreased dry matter levels of the silages. The silage with 4h of wilting time and no PFP inclusion presented the higher DM level. The CP ranged from 8.1 to 9.4% for the silage with 4 hours of wilting time and the addition of 25% and 75% of PFP, respectively. The silage with 100% elephant grass presented 7.49% CP. The NDF ranged from 63.2 to 58.0% for elephant grass silage with 4 hours of wilting time and the addition of 25% and 75% of PFP, respectively. The silage with 100% PFP presented 6.77% NDF. The values of pH, N-NH3 and TL ranged from 3.58 to 4.63; 8.11 to 12.13 and 0.08 to 2.85, respectively. These values can be considered normal for silage of good quality. Despite the reduced levels of DM, all treatments provided a good final product, especially the treatment with 25% of PFP inclusion and 4 h of wilting time.