Resumen

MONFORTE-BRAGA, Genaro et al. Comparison of two dietary markers in the determination of amino acid digestibility in some foodstuffs for growing broiler chickens. INCI [online]. 2006, vol.31, n.12, pp.876-880. ISSN 0378-1844.

The apparent ileal amino acid digestibility in maize, sorghum, soybean meal, maize gluten, fishmeal, meat and bone meal and wheat bran for growing broiler chickens were determined, using titanium dioxide (TiO₂) and chromium oxide (Cr₂O₃) as dietary markers. Twelve chickens were tube-fed 30g of each ingredient, containing one of the two dietary markers, in two occasions, using the forced feeding technique. Analyses of variance were performed on the data obtained to examine the effects of ingredients and markers. As expected, there were significant differences in amino acid digestibility between ingredients, ranging from 0.53 for cysteine in meat and bone meal to 0.97 for tyrosine in soybean meal. For all ingredients, the aminoacid digestibility coefficients calculated on the basis of the titanium marker were higher (P<0.05) than those determined using the chromium marker. The only exception was wheat bran, in which the marker was without effect (P>0.05). The aminoacid digestibility coefficients showed less variation when TiO₂ was used as the dietary marker. It is concluded that TiO₂ is a more suitable dietary marker than Cr₂O₃, being less variable and obtaining higher digestibility, which indicates a greater recovery.

Palabras clave : Aminoacid ; Chickens ; Chromium ; Digestibity ; Titanium .