Effect of Organic Selenium-Enriched Yeast Supplementation in Finishing Sheep Diet on Carcasses Microbiological Contamination and Meat Physical Characteristics

Abstract

The aim of the current study was to evaluate the effect of feeding Pelibuey sheep on diet supplemented with different doses of organic selenium (Se)-enriched yeast on carcasses microbiological contamination and meat physical characteristics. The experiment was conducted during the finishing stage of 18 female sheep and lasted for 60 days. In a complete randomized design, sheep were distributed to one of three treatments: the control without Se-yeast (T1), the control supplemented with Se-yeast at 0.35 mg Se/kg DM (T2), and control supplemented with Se-yeast at 0.60 mg Se/kg DM (T3). The yeast product used was Selyeast 3000 TM yeast (LFA Lesaffre, Toluca, Mexico) with a Se concentration of 3000 ppm (mg/kg). Lambs were slaughtered at the end of the experiment at an average weight of 39.5±4.41 kg and samples were taken for microbiological analysis. There were no differences between treatments (P>0.05) and the aerobic plate counts for T1, T2 and T3 had indexes of 0.10, 0.08 and 0.08 log10 CFU/cm 2 , respectively. Total coliform counts obtained were 0.13, 0.10 and 0.09 log10 CFU/cm 2 for T1, T2 and T3, respectively, and the faecal coliform counts were 0.09 log10 CFU/cm 2 for T1, 0.06 log10 CFU/cm 2 for T2 and 0.07 log10 CFU/cm 2 for T3. No significant effects (P>0.05) were observed for carcasses physical characteristics of microbial growth, initial and ultimate pH and temperature, colour values and water holding capacity. It can therefore be concluded that organic Se-enriched yeast did not affect carcasses bacterial proliferation or meat physical characteristics.

Evaluation of a Saccharomyces cerevisiae Fermentation Product on the Feedlot Performance and Carcass Merit of Hair Lambs Offered an Annual Ryegrass-Hay-Based Finishing Diet: A Pilot Study

“…Yeast products have been commonly used in the diets of production animals [ 3 ]. Supplementation of yeast as a feed additive, such as Saccharomyces cerevisiae or Saccharomyces cerevisiae fermentation products, is typically used in ruminant production animal diets to enhance the nutritional digestibility of low nutritive value forages [ 4 , 5 ], feed intake [ 6 , 7 , 8 ], average daily gain (ADG) [ 7 , 9 , 10 , 11 ], and carcass characteristics [ 12 , 13 , 14 , 15 ]. Saccharomyces cerevisiae fermentation product (SCFP) is a product of yeast fermentation that is different from live yeast.…”