This study aimed to evaluate the fermentation characteristics, losses and the chemical composition of two pearl millet genotypes silages submitted to nitrogen fertilization. The experimental design was a completely randomized blocks in a split plot scheme 2x5 (two nitrogen genotypes doses x five doses of nitrogen), with four replicates. Nitrogen doses were 0, 20, 40, 60, 80kg ha.sup.-1 and the pearl millet genotypes were the variety ADR300 and the hybrid ADR7010. The hybrid ADR 7010 showed average lactic acid content higher than the variety ADR 300, at all doses of N, recording values ranging from 4.09 to 10.46dag kg.sup.-1. There was an interaction between nitrogren doses and genotypes for the neutral detergent fiber, which ranged from 51.81 to 63.63dag kg.sup.-1 of dry matter. Dry matter recovery decreased linearly with increasing nitrogen doses only for hybrid ADR7010, the same did not happen for the ADR300. The nitrogen fertilization does not favor the fermentation characteristics and increases DM losses of the hybridADR7010. Key words: chemical composition, fermentation characteristics, lactic acid, semi-arid. Objetivou-se avaliar o perfil fermentativo, as perdas e a composicao bromatologica de silagens de dois genotipos de milheto, submetidos a adubacao nitrogenada. O delineamento utilizado foi em blocos casualizados em um esquema de parcelas subdivididas 2x5 (dois genotipos x cinco doses de nitrogenio), com quatro repeticoes. As doses de nitrogenio foram 0, 20, 40, 60, 80kg ha.sup.-1 e os genotipos de milheto foram a variedade ADR300 e o hibrido ADR7010. O hibrido ADR 7010 apresentou teores medios de acido latico superiores aos da variedade ADR 300 em todos os niveis de N, registrando valores que variaram de 4,09 a 10,46 dag kg.sup.-1. Houve interacao entre os niveis de adubo e os genotipos para a fibra em detergente neutro, que variaram de 51,81 a 63,63dag kg.sup.-1 de materia seca. A recuperacao de materia seca diminuiu linearmente com o aumento das doses de nitrogenio somente para o hibrido ADR7010, o mesmo nao acontecendo para a ADR300. A adubacao nitrogenada nao favorece o perfil fermentativo e incrementa as perdas de materia seca do hibrido ADR7010. Palavras-chave: composicao bromatologica, perfil fermentativo, acido latico, semiarido.