Bulls performance in feedlot with levels of substituting corn silage by pineapple by-products silage

The objective of this work was evaluate the effect of gradative substitution of corn silage (0, 20, 40 and 60%, of dry matter) by pineapple by-products silage on average daily gain, feed intake and feed conversion, carcass yield, fat thickness and loin eye area of bulls, finished in feedlot. Twenty eight bulls were used with approximately 20 months and initial body weight of 328 kg. The animals were divided in a completely randomized design, with four treatments (levels of pineapple by-products silage) and seven repetitions. Besides the corn silage and/or pineapple by-products silage, the animals received a concentrate formed by soybean meal, corn, mineral salt, urea and monensin. The animals were kept in a individually stable, fed ad libitum during 96 days. At the end of the period, the animals were slaughtered and the carcass characteristics were measured. There was no treatment effect on final body weight, average daily gain, crude protein and neutral detergent fiber ingestion, dry matter feed conversion, hot carcass weight and yield, loin eye area and fat thickness. Dry matter, organic matter, metabolizable energy ingestion for 100 kg body weight reduced linearly.