Two types of fermented shrimp waste silage (Xiphopenaeus kroyeri) were elaborated and characterized, alternating the sources of carbohydrates. The silages were elaborated with shrimp waste, 15% of carbohydrate - sugar cane molasses (SM) or "Farine Lactée" (SF) -, 10% of yogurt, 0.25% of sorbic acid, and 1% of formic acid. Each silage was characterized during storage for 120 days on proximate composition and non protein nitrogen, besides nutritionally compared by digestibility trials to Nile tilapia juveniles. After the 30th storage day, it was observed that SM presented higher ashes content (SM= 34.97g.100g-1 and SF= 30.92g.100g-1) and lower dry matter content (SM= 20.02g.100g-1, SF= 21.11g.100g-1). The apparent digestibility (ADC) and digestible protein coefficients did not vary between trials (P>0.05), but higher digestibility in the diets (ADC SM= 78.2%, ADC SF= 73.1%) was observed. No matter which carbohydrate source used, silage made from shrimp waste remained stable for 120 days and may be used in diets to Nile tilapia.
biological silage; shrimp waste; Xiphopenaeus kroyeri; Oreochromis niloticus; digestibility
