Fractional excretion of electrolytes in lactating dairy cows

S. A. Fleming From the Department of Food Animal and Equine Medicine and Surgery, College of Veterinary Medicine (Fleming, Hunt), the Department of Statistics, College of Physical and Mathematical Science (Brownie), and the Department of Animal Science, College of Agriculture and Life Sciences (Rakes, McDaniel), North Carolina State University, Raleigh, NC 27606.

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E. L. Hunt From the Department of Food Animal and Equine Medicine and Surgery, College of Veterinary Medicine (Fleming, Hunt), the Department of Statistics, College of Physical and Mathematical Science (Brownie), and the Department of Animal Science, College of Agriculture and Life Sciences (Rakes, McDaniel), North Carolina State University, Raleigh, NC 27606.

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C. Brownie From the Department of Food Animal and Equine Medicine and Surgery, College of Veterinary Medicine (Fleming, Hunt), the Department of Statistics, College of Physical and Mathematical Science (Brownie), and the Department of Animal Science, College of Agriculture and Life Sciences (Rakes, McDaniel), North Carolina State University, Raleigh, NC 27606.

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A. Rakes From the Department of Food Animal and Equine Medicine and Surgery, College of Veterinary Medicine (Fleming, Hunt), the Department of Statistics, College of Physical and Mathematical Science (Brownie), and the Department of Animal Science, College of Agriculture and Life Sciences (Rakes, McDaniel), North Carolina State University, Raleigh, NC 27606.

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B. McDaniel From the Department of Food Animal and Equine Medicine and Surgery, College of Veterinary Medicine (Fleming, Hunt), the Department of Statistics, College of Physical and Mathematical Science (Brownie), and the Department of Animal Science, College of Agriculture and Life Sciences (Rakes, McDaniel), North Carolina State University, Raleigh, NC 27606.

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Summary

Samples of serum and urine were obtained simultaneously from 56 healthy lactating cows to determine ranges of fractional excretion (fe) of calcium (Ca), phosphate (PO4), magnesium (Mg), sodium (Na), potassium (K), and chloride (Cl). Samples were obtained at 3 stages of lactation: period 1 = 1 to 7 days, 2 = 83 to 112 days, and 3 = 175 to 197 days. The fe of electrolytes were significantly different among periods 1, 2, and 3 for Ca (P<0.001), PO4 (P< 0.025) and Mg (P<0.025), but were not significantly different for Na, K, and Cl. Least squares mean fe of Ca was lowest in period 1 and not significantly different for periods 2 and 3, whereas mean fe values for PO4 and Mg were highest in period 2 and not significantly different for periods 1 and 3. The mean fe values of Na, K, and Cl did not change with stage of lactation. Age and category of milk production (high, medium, and low) did not influence the FE values of the electrolytes.

Summary

Samples of serum and urine were obtained simultaneously from 56 healthy lactating cows to determine ranges of fractional excretion (fe) of calcium (Ca), phosphate (PO4), magnesium (Mg), sodium (Na), potassium (K), and chloride (Cl). Samples were obtained at 3 stages of lactation: period 1 = 1 to 7 days, 2 = 83 to 112 days, and 3 = 175 to 197 days. The fe of electrolytes were significantly different among periods 1, 2, and 3 for Ca (P<0.001), PO4 (P< 0.025) and Mg (P<0.025), but were not significantly different for Na, K, and Cl. Least squares mean fe of Ca was lowest in period 1 and not significantly different for periods 2 and 3, whereas mean fe values for PO4 and Mg were highest in period 2 and not significantly different for periods 1 and 3. The mean fe values of Na, K, and Cl did not change with stage of lactation. Age and category of milk production (high, medium, and low) did not influence the FE values of the electrolytes.

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