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Com o objetivo de avaliar a degradabilidade in situ da matéria seca e proteína bruta das silagens de seis híbridos de sorgo em diferentes estádios de maturação, foram utilizados quatro novilhos mestiços de holandês-zebu, fistulados no rúmen, alimentados com feno de gramínea à vontade. As amostras de silagens foram secas e moídas em peneiras de 5 mm, e 5 g das mesmas foram colocadas em sacos de náilon de 12 x 18 cm e tamanho de poros de 50 µm, que foram introduzidos nas fístulas dos bovinos. Após diferentes períodos de incubação (6, 12, 24, 48, 72 e 96 horas depois), os sacos de náilon foram removidos, as amostras de um mesmo híbrido, animal e período de incubação foram transformadas em um "pool" homogêneo, moído em peneira de 1 mm e armazenado para análises posteriores de MS e PB. O delineamento experimental utilizado foi o de parcelas sub-subdivididas no qual as parcelas eram as silagens dos diferentes híbridos, as sub-parcelas eram os estádios de maturação e as sub-sub-parcelas eram os seis períodos de incubação. Neste estudo, houve diferenças quanto ao desaparecimento de matéria seca e proteína bruta nas silagens de sorgo, embora as diferenças não possam ser atribuídas à porcentagem de grãos dos híbridos. O estádio de maturação das plantas influenciou a degradabilidade efetiva das frações digestíveis, favorecendo os cortes mais precoces. In order to evaluate the in situ degradability of the dry matter and crude protein of silages of six sorghum genotipes in different stages of maturation, four fistulated crossbred holstein-zebu steers, fed with grass hay ad libitum, were utilized. The silage samples were dried and milled at 5 mm screen and 5 g of each sample were placed in 12 x 18 cm naylon bags and 50 µm porous size, and were introduced through the fistulas. After different times of incubation (6, 12, 24, 48, 72 and 96 hours later), the naylon bags were removed, the samples from the same genotipe, animal and time of incubation were transformed in a homogenous pool and milled at 1mm screen, and were stored for further analysis of DM and CP. It was used the split-split plot design in which the parcels were the silages of different genotipes, split-plots were the periods of harvesting and split-split-plots were the six periods of incubation. In this study, there were differences on dry matter and crude protein disappearance of the sorghum silages, although these can not be attributed to the percentage of grains in the different genotipes. The age of the plant influenced the effective degradability of digestible fractions, benefiting early stages

revista brasileira de zootecnia

Degradabilidade in Situ da Matéria Seca e Proteína Bruta das Silagens de Seis Genótipos de Sorgo (Sorghum bicolor (L.) Moench) em Diferentes Estádios de Maturação