&lt;b&gt;Performance of beef cattle bulls in feed lots and fed on diets containing enzymatic complex

Leonardo Guimarães De Oliveira,Cirano José Ulhoa,Emmanuel Arnhold,João Teodoro Padua,Cristine Dos Santos Settimi Cysneiros,Reginaldo Nassar Ferreira

doi:10.4025/actascianimsci.v37i2.26446

<b>Performance of beef cattle bulls in feed lots and fed on diets containing enzymatic complex

Leonardo Guimarães De Oliveira, Cirano José Ulhoa + Show 4 more

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https://doi.org/10.4025/actascianimsci.v37i2.26446

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Abstract

Current paper evaluates the performance of confined beef cattle supplemented with amylolytic enzyme complex produced by fungus Aspergillus awamori and a commercial product containing multienzyme complex, yeast and MOS. Treatments comprised control (basal diet composed of 16% Mombasa grass silage, 66% ground corn, 3% vitamin nuclear mineral and 15% cottonseed meal), amylase treatment (control diet with the addition of 48.7 saccharifying units kg -1 diet) and compound treatment (control diet with the addition of enzymatic complex composed of 83.2 saccharifying units, 8.8 fibrolytic units, 0.05 g of mannan oligosaccharides and 0.2 g of inactivated yeast Kg -1 of the dry matter diet). The addition of products did not significantly increase daily weight gain, intake, feed conversion and carcass yield of cattle. There was no difference between in vitro digestibility of dry matter (IVDMD) in the diets. The percentage of residual fecal starch was not influenced by exogenous amylolytic enzymes of amylase and compound treatments. The tested products were not able to improve animal performance.

Highlights

Several diets may provide low rates of rumen degradation due to the impairment of enzyme activities produced by rumen microorganisms on the substrate
Treatments failed to alter (p < 0.05) average daily gain, voluntary intake, feed conversion and carcass yield of bulls finished in feedlot (Table 2)
Nozière et al (2014) did not report any positive effects on animal performance with enzyme supplementation higher than doses in current experiment, even though the inclusion of exogenous amylolytic enzymes increased by 8% the degradability of starch in the rumen without any increase in starch digestibility in the entire digestive tract

Summary

Introduction

Several diets may provide low rates of rumen degradation due to the impairment of enzyme activities produced by rumen microorganisms on the substrate. Since the amount of substrate and its availability in the rumen are not restricting, the quantity of available enzyme in the rumen may limit the degradation process (Dehority & Tirabasso, 1998). Enzyme supplementation may be an alternative to increase animal efficiency and reduce diet costs by greater amounts of available nutrients. A positive aspect that causes the use of exogenous enzymes in the diet of ruminants is that they function within a wide temperature range in the rumen (Colombatto et al, 2003)

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Conclusion