PSXIV-27 Do mycotoxin contaminated diets and yeast-derived adsorbent affect meat quality of finishing Nellore cattle in feedlot?

摘要

The objective was to evaluate the effect of mycotoxins and yeast-derived adsorbent on meat quality of Nellore cattle finishing in feedlot. Ninety-six Nellore cattle were used, (430 ± 1.0 kg and 24 mo). The treatment design was a 2 × 2 factorial arrangement consisting of two diets with natural contamination (NC) or exogenous contamination (EC) and presence (10g/hd daily) or absence of yeast-derived adsorbent (YDA). The diets with NC and EC had the following contaminations levels: aflatoxin 0 and 10 µg/kg, fumonisin 5114 and 5754 µg/kg, trichothecenes B 0 and 42.1 µg/kg, trichothecenes A 0 and 22.1 µg/kg, fusaric acid 42.9 and 42.9 µg/kg and REQ 15 and 45 µg/kg, respectively. The REQ is the risk equivalency quantities expressed in µg/kg of AFB1-equivalent, which is mycotoxin concentrations interpretation according to known species specific sensitivities and normalized according to the principles of toxic equivalent factors. After 97 days of experiment, all animals were slaughtered and the carcasses were stored in a chilling chamber at 4ºC. Three steaks from longissimus (2.5 cm thick) were cut between 11L*, a*, b*), cooking losses, shear force and chemical composition were analyzed. The L*, a* and b* colors were similar among factors (P ≥ 0.38), as was the cooking loss (P = 0.94; 32.4, 32.5, 33.1, 31.0%, for NC, NC+YDA, EC, EC+YDA respectively) and the shear force (P = 0.50; 6.8, 6.9, 6.8, 6.5 kgf, respectively). The chemical composition also was unaffected (P ≥ 0.61) by the treatments and the average of variables were 74.2% for moisture, 22.7% for CP, 1.04% for EE, and 2.10 for ash. In conclusion, at this level of contamination mycotoxin and yeast-derived adsorbent do not affect the meat quality of finishing Nellore cattle in feedlot.