Uso de pré-emurchecimento, inoculante bacteriano-enzimático ou ácido propiônico na produção de silagem de Tifton 85 (Cynodon sp.). / Use of wilting, microbiological additive or propionic acid on production of Tifton 85 (Cynodon sp.) silage.

AUTOR(ES)

Flávio Geraldo Ferreira Castro

DATA DE PUBLICAÇÃO

2002

RESUMO

The objectives of this work were to study the effects of wilting and microbiological additive or buffered propionic acid (BPA) on the fermentation characteristics, chemical composition, microbiological profile, physical parameters, aerobic stability and efficiency of the ensiling process of Tifton (Cynodon sp.) silage stored in plastic wrapped square bales. The treatments were: five forage dry matter contents (250, 350, 450, 550 and 650 g kg -1 DM), three forage dry matter contents (250, 350 and 650 g kg -1 DM) sprayed with bacterial-enzymatic additive (BEA) and wilted forage (650 g kg -1 DM) sprayed with BPA. Core samples were taken 0, 6 and 12 hours and 1, 2, 4, 8, 16, 32, 90 and 180 days of storage. The chemical composition was determined on samples taken 0, 8, 16, 32, 90 and 180 days of storage and the microbiological and physical-chemical parameters on samples taken 0, 32 and 180 days of storage. Aerobically stability was used to indirectly estimate losses on 32, 90 and 180 days of storage. The 550 g kg -1 forage dry matter showed the highest silage efficiency production, due to intermediary wilting time, high dry matter density, low dry matter losses during raking and harvesting, and large digestible mass recovery. The treatments with 650 g kg -1 DM were efficient was well, however, the needed longer time to achieve this final dry matter content (longer than 24 hours) may elevate the risk of rain damage. Wilting to 450 g kg -1 DM favored fermentation qualitative traits and silage quality. BPA showed no effects and BEA did increase aerobic stability in the intermediary silage dry matter (450 g kg -1 ) and showed slight benefits only on higher dry matter silages. The very poor quality direct cut silage showed high levels N-NH3 and low aerobic stability. Microorganism growth and fermentation intensity were inhibited in the wilted silages with 550 and 650 g kg -1 DM, which enhanced aerobic stability. The addition of BPA showed no positive results in the silages with 650 g kg -1 DM.

ASSUNTO(S)

variedade vegetais cultivar grasses silage silagem drying capins secagem

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