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Este trabalho foi realizado para avaliar as características físicas da digesta ao longo do trato gastrintestinal e examinar a concepção de "tamanho crítico" de partículas que escapam do retículo-rúmen (RR), em bezerros de rebanhos leiteiros, submetidos a dietas com diferentes níveis de concentrado. Trinta e dois bezerros machos não-castrados, metade holandeses PC e metade mestiços (Holandês x Zebu), foram abatidos com idade média seis meses e 190 kg PV, após jejum de 16 horas. As dietas, fornecidas à vontade, foram constituídas de feno de capim coast-cross e diferentes níveis de concentrado(milho moído, farelode soja e sal mineral): 45,0; 60,0; 75,0; e 90,0% de concentrado na ração. Os conteúdos do RR, omaso (OM), abomaso (ABO), intestino delgado (ID) e intestino grosso (IG) foram amostrados para avaliar o tamanho médio de partícula (TMP), o módulo de finura (MF) e a resistência relativa média (RRM) ao escape e examinar a concepção de um "tamanho crítico" de partículas que abandonam o RR. A ingestão de dieta com níveis crescentes de concentrado não influenciou o TMP e o MF, já que as partículas escaparam do RR. Portanto, o tamanho das partículas do IG poderia representar o tamanho das partículas que escapam do RR. Neste estudo, mais de 80% das partículas presentes no RR foram inferiores ao tamanho considerado crítico ao escape, indicando que a redução do tamanho, embora seja pré-requisito, não foi o passo limitante que regula a saída de material do RR. A resistência relativa da digesta ao escape do RR cresce à medida que as partículas são maiores, porém a RRM decresce com níveis crescentes de concentrado na dieta. This work was carried out to evaluate the physical characteristics of the digesta throughout the gastrointestinal tract and to exam the conception of critical particle size that escape from the reticulum-rumen (RR), in the dairy bull calves fed diets with different concentrate levels. Thirty two dairy bull calves, one half straightbred Holstein and half crossbreed Holstein-Zebu, slaughtered with average six months of age and 190 kg LW, after fasting for 16 hours. The diets fed libitum were constituted of coast-cross hay, and of different concentrate levels (ground corn, soybean meal and mineral salt): 45.0, 60.0, 75.0, and 90.0 of concentrade in diet. The content of RR, omasum (OM), abomasum (ABO), small (SI) and large intestine (LI) were sampled to evaluate the average particle size (APS), modulus of fineness (MF) and average relative resistance (ARR) to escape, and to exam the critical particle size conception that escaped from the RR. The intake of diet with crescent levels of concentrate did not influence the APS and the MF, as the particles already escaped the RR. Consequently, the particle size of the LI could represent the particle size that escape RR. In this study, more than 80% of the particles presented in the RR were lower than the critic particle size threshold to escape, showing that the reduction of particle size, although it was a prerequisite for escape, it was not the rate-limiting step regulating the RR material clearance. The relative resistance of the digesta to escape from the RR increased as the particles was larger, although the ARR decreased with the increase of the concentrate levels in the diet

Características físicas da digesta de bezerros provenientes de rebanhos leiteiros alimentados com dietas contendo diferentes níveis de concentrado