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摘要
No presente estudo, objetivou-se avaliar os efeitos do tempo de aera o sobre as caracter赤sticas nutricionais e fermentativas da silagem de cana-de-a 迆car. Utilizou-se o delineamento inteiramente casualizado com tr那s tratamentos e quatro repeti es. A cana-dea 迆carrec谷m-picada foi exposta 角 aera o por 0, 4 ou 8 horas, sendo ensilada somente ap車s cada tempo de espera. Ap車s a exposi o, o material foi ensilado em 12 silos experimentais confeccionados de baldes pl芍sticos. A abertura dos silos ocorreu 85 dias ap車s a ensilagem. Foram determinados os teores dos 芍cidos organicos e a composi o qu赤mico-bromatol車gica das silagens. Foi observado desvio da linearidade (p %26lt; 0,05) do tempo de aera o sobre os teores de mat谷ria seca e efeito linear crescente (p %26lt; 0,05) sobre os teores de FDA, FDN e carboidratos sol迆veis, mas decrescente para a digestibilidade in vitro da mat谷ria seca. Para os teores de 芍cidos organicos, observou-se desvio da linearidade sobre o 芍cido ac谷tico ecomportamento linear (p %26lt; 0,05) decrescente para o 芍cido l芍tico e but赤rico, bem como para os valores de pH. N o foram observados efeitos sobre os valores de etanol, que se apresentou bastante alto (22% da MS) independentemente do tempo de aera o. A estabilidade aer車bia da silagem piorou com o aumento do tempo de aera o. This trial aimed at evaluating the deleterious effects of aeration time on nutritive value and other fermentative characteristics of sugarcane silage. A completely randomized design was usedwith three treatments and four repetitions per treatment. Fresh chopped sugarcane was exposed to aeration for 0, 4 or 8 hours, and ensiled soon after. After exposure, the material was ensiled in 12 laboratory silos (plastic buckets). Silos were opened 85 days after ensiling, when organic acids contents and chemical composition of silages were determined. Deviation of linearity (p %26lt; 0.05) was observed for aeration time on dry matter. A positive linear effect was observed (p %26lt; 0.05) on ADF, NDF and soluble carbohydrates content, but negative for ammoniacal nitrogen content and in vitro digestibility of dry matter. For organic acids content, deviation of linearity was observed on acetic acid, with the lowest content(1.5% of DM) observed after 8 hours of aeration, and a negative linear effect was observed for lactic and butyric acids, as well as for pH values. There were no effects on ethanol concentration, which remained very high (22% of DM), regardless of aeration time. Aerobicstability of silage worsened with the increase in aeration time.
