Microencapsulation allows slow release of organic acids in the GI tract of broilers.

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.