In vitro evaluation of limestone, dicalcium phosphate, and phytase on calcium and phosphorus solubility of corn and soybean meal

Poultry Science
C L WalkAudrey McElroy

Abstract

A series of in vitro trials was conducted to evaluate the influence of limestone, dicalcium phosphate, phytase, and the digestion phase on Ca and P solubility. Experimental samples were arranged as a 2 × 2 × 2 × 2 factorial and contained corn (experiment 1) or soybean meal (experiment 2) plus limestone, dicalcium phosphate, phytase, and all combinations. Calcium and available P in the samples were maintained at 1.0% with limestone and 0.45% with dicalcium phosphate, respectively. Phytase was added to the samples at 1,000 FTU/kg. Samples were exposed to a 2-step in vitro digestion assay to simulate the gastric and the small intestinal (SI) phases of digestion. In experiment 1, dicalcium phosphate improved (P ≤ 0.05) P solubility in the gastric phase, which did not change in the SI phase, except when phytase was supplemented, which reduced (P ≤ 0.05) P solubility in the SI phase. The small amount of Ca present in corn is highly soluble, but limestone, dicalcium phosphate, or phytase reduced (P ≤ 0.05) Ca solubility in the gastric phase. Solubility was further reduced (P ≤ 0.05) in the SI phase in the presence of limestone. In experiment 2, P was more soluble (P ≤ 0.05) in the presence of limestone, dicalcium phosphate, or phytase...Continue Reading

Citations

Feb 15, 2008·Journal of Biological Engineering·Angela D Rodriguez, Marty D Matlock
Mar 2, 2017·Journal of the Science of Food and Agriculture·Vera SommerfeldMarkus Rodehutscord
Dec 19, 2020·Journal of the Science of Food and Agriculture·Vera Sommerfeld, Regiane R Santos

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