Abstract
The objective of this study was to evaluate the effect of supplementation of monensin, yeast and glucogenic precursors on growth performance and digestive characteristics of feedlot beef cattle. The treatments evaluated were: control, monensin (40 mg/kg DM), S. cerevisiae (10 g/a/d) and a mix of 1,2-propanediol and calcium propionate as glucogenic precursors (20 g/a/d) as D1, D2, D3 and D4, respectively. In trial 1, eighty steers (261±8 kg) were evaluated for 120d for growth performance variables. Thus, supplementation increased the average daily gain, feed efficiency and final weight (P less than 0.05). In Trial 2, four steers (260±5 kg) were used to evaluate ruminal fermentation and total digestive parameters. The ruminal propionate concentrations and the flow of nitrogen to duodenum increased with supplementation (P less than 0.05) whereas the ruminal digestion of nitrogen decreased with supplementation (P less than 0.05). It is concluded that productive parameters and propionate production are higher when supplementing with 10 g/a/d of S. cerevisiae and 20 g/a/d of the glucogenic precursor which presented a lower ruminal protein degradation.
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