Effect of exogenous fibrolytic enzyme and slow release urea in finishing rations for lambs

An experiment was conducted to evaluate if the combination of fibrolytic enzymes (FEs) and slow release urea (SRU) could improve the productive performance of lambs fed with a diet of 60%25 of concentrate. Twenty lambs were assigned to a completely randomized design with factorial arrangement (2×2). The treatments were a control group, SRU diet (1%25 DM), FE (0.3%25 DM) and the combination of both additives (SRU %2b FE). No interaction was detected between SRU and FE. The SRU significantly reduced the daily gain (0.14 vs. 0.20 kg/d; P < 0.01) and negatively affected the food conversion (P <0.01; 8.24 vs. 5.99). The addition of the FE had no effect on the productive parameters or indicators of rumen fermentation. The results indicate that slow release urea can negatively affect finishing rations, and that there is no response to the addition of FEs in these conditions. © 2011 Taylor %26 Francis.

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