Evaluation of ruminal disappearance and solubility of calcium, ‎phosphorus, sodium, magnesium and potassium from some feedstuffs ‎and calcium supplements ‎

The aim of this study was to investigate the ruminal disappearance (releases or solubility) of mineral elements (calcium, phosphorus, magnesium, sodium and potassium) from feedstuffs (wheat straw, sugar beet pulp, alfalfa, silage and wheat bran) and to compare the disappearance of five types of mineral supplements (mono calcium phosphate, di calcium phosphate, calcium carbonate, oyster shell and limestone). The analysis of the feed section was performed by a completely randomized design five feed and the mineral supplements section was performed. Examination of ruminal release of minerals from feeds showed that except calcium, a large part of minerals in food was released at zero time (P<0.05). Disappearance rate increased with increasing incubation time. Release order of elements in the incubation times was in the form of potassium, phosphorus, calcium, sodium and magnesium and the highest disappearance rate was for potassium and the lowest release rate was for magnesium (P<0.05). In the study of the highest release rate was obtained during 72 hours of incubation for potassium in alfalfa hay (P<0.05). In the other part of the experiment, the highest disappearance was obtained for monocalcium phosphate and the lowest for calcium carbonate in total incubation times (P<0.05). Also, monocalcium phosphate mineral supplements had the highest and calcium carbonate treatment had the lowest disappearance parameters soluble part of dry matter, and significant difference between experimental treatments for effective dry matter degradability at flow rates of 2, 5 and 8 (P<0.05). In general, the amount of potassium disappearance was the highest in all nutrients and in all incubation times, and also monocalcium phosphate had the highest rate of degradability parameters.