This study aimed to assess the fermentation profile, losses and chemical composition of the silages of five sorghum cultivars. A completely randomized design with five replicates was used. The experimental treatments were represented by five sorghum cultivars (Sorghum bicolor (L). Moench): 'BRS Ponta Negra', 'BRS 610', 'BRS 655', 'BRS 800' and 'BRS 810'. There was variation (P<0.05) for the pH in the cultivars studied, with highest result of pH by 'BRS 610'. The average percentages of lactic acid, acetic acid and propionic acid, differed (P<0.05) among the cultivars, ranging from 32.9 to 59.5, 19.8 to 39.8, and 0.0 to 1.3g kg.sup.-1, respectively. The dry matter recovery varied among cultivars (P<0.05), allowing the identification of BRS Ponta Negra, and 'BRS 810' silages, as those which recovered the lowest dry matter, with values of757.1 and 776.1g kg.sup.-1, respectively. There were differences (P<0.05) for dry matter, crude protein, ether extract, neutral detergent fiber, non-fibrous carbohydrates and total carbohydrates contents among the cultivars. It was concluded that, despite the morphological and chemical differences among cultivars, the resulting silages had good fermentation profile. Key words: conservation, ensilage, quality, Sorghum bicolor. Objetivou-se com este estudo avaliar o perfil fermentativo, perdas e a composicao bromatologica de silagens de cinco cultivares de sorgo. Foi utilizado um delineamento experimental inteiramente casualizado com cinco repeticoes. Os tratamentos experimentais foram representados por cinco cultivares de sorgo (Sorghum bicolor (L). Moench): 'BRS Ponta Negra', 'BRS 610', 'BRS 655', 'BRS 800'e 'BRS 810'. Houve variacao (P< 0,05) para o pH nos genotipos estudados, com maior resultado para o genotipo 'BRS 610'. Os valores medios de acido latico, acido acetico e acido propionico, diferiram entre as cultivares (P<0,05), variando de 32,9 a 59,5; 19,8 a 39,8; e 0,0 a 1.3g kg-', respectivamente. A recuperacao de materia seca variou entre as cultivares (P<0,05), em que as silagens dos cultivares 'BRS Ponta Negra' e 'BRS 810', e que tiveram menor recuperacao de materia seca, com valores de 757,1 e 776,1g kg.sup.-1, respectivamente. Houve diferenca (P<0,05) para teores de materia seca, proteina bruta, extrato etereo, fibra em detergente neutro, carboidratos naofibrosos e carboidratos totais entre as cultivares. Conclui-se que, apesar das diferencas morfologicas e quimicas entre as cultivares, as silagens resultantes tinham adequado padrao de fermentacao. Palavras-chave: conservacao, ensilagem, qualidade, Sorghum bicolor.