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Journal of Dairy Science Vol. 80 No. 6 1207-1216
© 1997 by American Dairy Science Association ®
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Dietary Mixtures of Sodium Bicarbonate, Sodium Chloride, and Potassium Chloride: Effects on Lactational Performance, Acid-Base Status, and Mineral Metabolism of Holstein Cows

W. K. Sanchez 1, D. K. Beede 1, and J. A. Cornell 1

1 Institute of Food and Agriculture Science, University of Florida, Gainesville 32611

The objective of this study was to determine lactational, blood mineral, and blood acid-base responses to dietary mixtures of NaHCO3, NaCl, and KCl and dietary cation-anion difference by lactating dairy cows. Three 100:0:0 (primary) blends, three 50:50:0 (binary) blends, and one 33:33:33 (tertiary) blend of NaHCO3, NaCl, and KCl, respectively, were formulated to replace 1% of the dry matter in a diet based on corn silage. Seven treatments were defined according to a simplex-centroid mixtures design using a partially balanced incomplete block arrangement. An eighth treatment served as a control and contained 1% SiO2 instead of the mineral blends. Dietary cation-anion difference ranged from +25 to +40 meq of (Na + K – Cl)/100 g of dietary dry matter. Diets were fed for three consecutive 28-d periods during summer to 36 midlactation cows. Cows that were fed the tertiary mixture had lower milk protein percentage, whole blood bicarbonate, and plasma K than did cows fed the other blends. With the exception of milk protein percentage and body weight gain, none of the mixtures had a significant impact on lactational performance. The lack of differences could have been due to the narrow range in the dietary cation-anion difference studied.

Key Words: sodium bicarbonate • sodium chloride • potassium chloride • cation-anion difference

Submitted on September 29, 1995
Accepted on October 11, 1996




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