Drying and preservation during storage of an animal feed made with cachaza, bagasse and liquid waste (GARANVER)
Abstract
A preliminary study on a small scale to establish the drying parameters for an animal feedstuff (GARANVER) containing filter cake mud, sugarcane bagasse pith, liquid waste (acid, alkaline, and sugared residuals), urea, and final molasses was carried out. The feedstuff was exposed to sun rays on a concrete floor. Treatments applied were four feedstuff densities (70, 85, 100, and 125 t/ha), and two turnover frequencies (every one and two hours). Each treatment had five replicas. Raw matter variation was taken as a measuring parameter at 24, 48, and 72 hours. Data were evaluated according to a simple classification variance analysis with a factorial arrangement. Afterwards, drying was performed on a commercial scale with two feedstuff densities (70 and 125 t/ha). Dry matter was sampled for microbiological tests. The feedstuff was storaged for six months and its bromatological components were monthly tested. Results showed the possibility of reaching a dry matter level above 85 % with a 70 t/ha density at 48 hours and an hour turnover frequency. With feedstuff densities of 80; 100, and 125 t/ha, the period of time enlarged up to 72 hours with both turnover frequencies. Feedstuff drying on a commercial scale showed a similar behaviour. The microbiological tests showed neither Salmonella nor other proteolytic organisms. Nutrient components remained stable during the storage period.
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