The effect of five dietary concentrate levels on the gastrintestinal contents and internal organs weight of Nellore bulls was evaluated. Twenty-five animals averaging 330 kg and 20 months of age were allotted to a completely randomized design, with five treatments constituted by different dietary concentrate levels in dry matter (25.0, 37.5, 50.0, 62.5, and 75.0%). The animals, when reached the pre-established slaughter weight of 450 kg, were slaughtered and the organs and viscera weights were recorded. Regression equations were fitted to determine the effect of dietary concentrate inclusion on each organ weight and, or, viscera. The absolute and relative weights of gastrintestinal tract content linearly decreased, while the liver, kidneys and spleen weights linearly increased, in function of concentrate levels in the diets. The reticulum-rumen weights were quadractily influenced by the concentrate levels, with minimum values estimated in 6.45 kg and 1,60 kg/100 kg empty body, for the levels of 51.72 and 55.51% of concentrate in the diets, in relation to the absolute and relative weights, respectively. The internal fat content linearly increased as dietary concentrate increased.
concentrate; gastrintestinal content; internal fat; internal organs
