Grilli, E., C. Bodin, P.P. Gatta, M. Tedeschi, and A. Piva.
(2007) XVI European Symposium on Poultry Nutrition. August, 26-30, Strasbourg, France.
Aim of the study was o investigate intestinal concentrations of citric and sorbic acid (OA) from a microencapsulated blend and the possible consequences on intestinal fermentations. Twelve male ROSS 508 broilers were selected from 2 dietary treatments: a control diet (CTR), or the control diet added with a microencapsulated blend of citric and sorbic acid at 400 ppm (TRT). Contents of gizzard, small intestine and ceca were collected to be analysed for pH, NH3, VFA and OA concentration; coliforms and lactic acid bacteria were counted. All data were analysed with an unpaired t-student test, and considered statistically significant at P<0.05. Citric acid was detected all along the GI tract in both CTR and TRT group, but it was present in higher concentrations in TRT (gizzard: 1.8 mmol/L for the CTR group vs. 3.8 mmol/L; small intestine 0.58 mmol/L vs 1.16 mmol/L; ceca: 0.40 mmol/L vs 0.46). Sorbic acid was not detectable in birds fed the CTR diet whereas it decreased along the GI tract of TRT fed birds (gizzard: 60 μmol/L; small intestine: 6 μmol/L; ceca: 0 μmol/L). Data showed that the microencapsulation allowed the supply of sorbic acid to teh small intestine.