Abstract
In feedlot system is particularly important to reduce the cattle feeding cost without impact on the animal gain and carcass, in this sense, aimed with this study to evaluate animal performance and carcass traits of the young Nellore male (n = 40) finished with agro-industrial by-products in feedlot diet. The addition of cottonseed by-product (CSB) was based on the ether extract (EE) contents in the feedlot diet: 3, 4 and 5%; and two other reference treatments were also tested, with 3 and 5% of EE content and soybean by-product (SOB) as fat source, totalling five experimental diets. In diets with 3% EE, CSB did not alter performance, gain cost or carcass traits compared to the SOB. In diets with 5% EE, animals fed with CSB showed greater dry matter (DM) intake than animals fed with SOB (10.34 versus 8.94 kg/day), but because CSB is a cheaper ingredient than SOB, it reduced the gain cost from 1.60 to 1.35 US$/kg. The CBS used in diet with 3, 4 and 5% EE increased the daily gain (1.17, 1.38 and 1.50 kg/day) and the rumination time (225, 338 and 370 min/day, respectively). So, CSB does not change the carcass traits nor the feeding behaviour when compared to SOB. The increased of CSB concentration in the diet raised the daily gain, DM intake and rumination time, with no changes in carcass traits.
Highlights
Millen, Pacheco, Arrigoni, Galyean, and Vasconcelos (2009) reported that 80% of the Brazilian feedlot consulting nutritionists used a by-product in their formulations for beef cattle, especially cottonseed
In diets with 3% ether extract (EE), cottonseed by-product (CSB) did not alter performance, gain cost or carcass traits compared to the soybean by-product (SOB)
In diets with 5% EE, animals fed with CSB showed greater dry matter (DM) intake than animals fed with SOB (10.34 versus 8.94 kg/day), but because CSB is a cheaper ingredient than SOB, it reduced the gain cost from 1.60 to 1.35 US$/kg
Summary
Pacheco, Arrigoni, Galyean, and Vasconcelos (2009) reported that 80% of the Brazilian feedlot consulting nutritionists used a by-product in their formulations for beef cattle, especially cottonseed. A similar study conducted in the United States showed that 82% of Americans nutritionists use some by-product in their formulations, mainly corn derived from ethanol distillers (Vasconcelos & Galyean, 2007). Based on modifications of the process of ethanol production, Berger and Singh (2010) predicted effects in animal nutrition, bearing in mind the amount and nutritional characteristics of the new by-products. They suggested that beef cattle can efficiently use these by-products as replacements for the traditional sources of protein and energy. The objective of this study was to evaluate animal performance, feeding behaviour and carcass traits of young Nellore bulls finished in feedlots with increasing of agro-industrial by-products in the diet
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