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Effect of level of feed intake and time of sampling after feeding on concentrations of dissolved sodium, potassium, calcium, magnesium, and phosphorus in bovine rumen fluid



Effect of level of feed intake and time of sampling after feeding on concentrations of dissolved sodium, potassium, calcium, magnesium, and phosphorus in bovine rumen fluid



Journal of Dairy Science 52(2): 205-210



Four dry Holstein cows were fed on all-roughage diets of reed canary grass hay, Phalaris arundinacea, at 1.00, 1.33, 1.67 and 2.00 kg per l00kg liveweight per day. Increased feeding gave rumen fluid with less Na and more Ca and Mg. The average K concentrations rose when the intake changed from low to medium but decreased with the high feed intake. P concentrations were affected significantly by feeding, but the changes were irregular and unexplainable. There were significant decreases in Na concentration and increases in K and Mg during the first 2 to 4 h after feeding. Concentrations returned to, or near to, prefeeding levels at the second daily feeding. The hourly concentration changes for Ca and P, though significant, were irregular. In no case was the shape of the mineral concentration curves over the 9-h sampling period affected by feed intake.

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Accession: 014439581

Download citation: RISBibTeXText

PMID: 5763757

DOI: 10.3168/jds.s0022-0302(69)86530-6


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