Abstract
Laboratory and field experiments were conducted to evaluate lactic acid fermentation, with industrial carbohydrate by-products as fermentation substrates, in the stabilization of broiler processing offal, blood, and dissolved air flotation wastewater (DAF) sludge, and poultry carcasses. Additions of 15% brewer's solubles, 15% dry molasses, 10% liquid molasses, 6% can sugar, 6% whey product, or higher proportions to ground fresh carcasses or offal produced acidic silage (ph≤4.2) at 30°C or 37°C over eight days. Carcasses fermented with corn meal at 15% or less putrefied. Reduced temperature (21°C) slowed fermentation. Adding a commercial silage culture of lactic acid bacteria did not enhance fermentation. Offal mixed with DAF sludge at 12% and 24% was preserved as well as offal alone. Fermentation with 15% brewer's solubles was the most cost-effective stabilization method for preserving both poultry processing by-products and waste and poultry carcasses for subsequent nutrient recovery.
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