BIOPROCESS FOR THE TRANSFORMATION OF POULTRY SLAUGHTERHOUSES WASTES

ESSENDOUBI  S.,  FAID M., EL JALIL M.H  AND ELYACHIOUI M.

Summary

Poultry slaughterhouses wastes or by-products were supplied with molasses in the ratio 90:10 and inoculated with strains of Lactobacillus plantarum to study the biopreservation process by fermentation. All the trials were carried out in triplicates and analyzed before and during the transformation (8 days) for their microbiological and physico-chemical determinations. The formers included plate counts, coliforms, Salmonella, Clostridium and yeasts and the laters included also the pH and the total volatile nitrogen. Results concerning the microbiological evaluations showed that the samples were highly contaminated. Coliforms reached 7.10⁵ cfu/g, the plate counts were also from 8x10⁶ to 4x10⁸cfu/g and Clostridium counts ranged from 1x10² to 4x10² cfu/g. Biotransformation assays yielded a rapid pH decrease and a drastic decrease in coliforms and Clostridium counts in all the trials. Salmonella was not detected in any trial. An increase in yeast populations was also observed in all the trials. The quality of the obtained product was characterized by the total volatile nitrogen which decreased during the fermentation and stopped at the end of the process indicating a good preservation of the product.