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Journal of Dairy Science Vol. 75 No. 3 820-828
© 1992 by American Dairy Science Association ®
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Effects of Ammonium Chloride and Sulfate on Acid-Base Status and Calcium Metabolism of Dry Jersey Cows

C. Wang 1 and D. K. Beede 1

1 Dairy Science Department, Institute of Food and Agricultural Sciences University of Florida Gainesville 32611-0701

Eight nonlactating, nonpregnant Jersey cows were used in a crossover experiment with two 28-d periods. The control diet consisted of corn silage plus a concentrate mix (68:32, DM basis). The treatment diet was the same, except that and (NH4)Cl (NH3)2SO4 (98 g of each/d per cow) were added to the concentrate. Cows fed the treatment diet had lower blood pH, higher ionized Ca in blood, and more urinary excretion of Ca, titratable acid, and ammonium than cows fed the control diet. For cows fed the treatment diet, ionized Ca in blood was greater after equal amounts of Na2-EDTA were infused to both treatment groups, and treatment cows recovered faster after infusion of Na2-EDTA was stopped than did control cows. The treatment diet induced mild metabolic acidosis and increased the cows' ability to maintain normal blood Ca concentrations; it potentially could reduce incidence of milk fever.

Key Words: acid-base status • calcium • dairy cattle • cation-anion difference

Submitted on April 8, 1991
Accepted on October 9, 1991




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