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Abstract

Digestibility of diets containing an antibiotic, a probiotic and a prebiotic in growing rabbits. This study aimed to evaluate the effects of a probiotic and/or prebiotic additive on the nutrient digestibility of diets
for growing rabbits. Twenty 50-day-old rabbits were used. A completely randomized experimental design, with fi ve treatments and four replicates each, was used. The applied treatments (T) were the following: T1 = negative control diet (no growth promoter); T2 = diet with antibiotic, positive control (0.05% zinc bacitracin); T3 = diet with probiotic (0.15% Bacillus subtillis at a concentration of 109 UFC/g); T4 = diet with prebiotic (0.15% phosphorylated mananoligossaccharide at 30%); and T5 = diet with symbiotic (probiotic + prebiotic). The experimental period lasted 12 days, seven for adaptation to the experimental diets and to the cages, and fi ve days of feces collection. The apparent digestibility coeffi cients of dry matter, organic matter, crude protein, neutral detergent fi ber, acid detergent fi ber, mineral matter, and ether extract were calculated. The addition of a probiotic and of a symbiotic to the rabbit diet resulted indigestibility similar to that of animals fed diets containing antibiotics or no additive at all. The best digestibility results were obtained with the prebiotic.