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Journal of Dairy Science Vol. 77 No. 10 3111-3117
© 1994 by American Dairy Science Association ®
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Natural Sodium Sesquicarbonate Fed for an Entire Lactation: Influence on Performance and Acid-Base Status of Dairy Cows

W. B. Tucker 1, I. S. Shin 1, J. F. Hogue 1, M. Aslam 1, G. D. Adams 1, M. T. Van Koevering 1, R. K. Vernon 1, and K. R. Cummings 1

1 Animal Science Department, Oklahoma State University, Stillwater 74078-0425

Forty-eight multiparous Holstein cows were blocked according to month of parturition, age, and previous milk yield and arranged in a randomized complete block design to evaluate the effect of a naturally occurring sodium sesquicarbonate on DMI, milk yield, milk composition, milk value, and systemic acidbase status. Cows were assigned at parturition to diets containing sorghum silage, alfalfa hay, concentrate, and 0 or 1% naturally occurring sodium sesquicarbonate (D basis); cows were fed these diets for 308 d postpartum. Blood was collected every 4 wk via jugular venipuncture for analysis of pH, HCO3, partial pressure of O2, and partial pressure of CO2. Sesquicarbonate exhibited alkalogenic properties by increasing blood HCO3, partial pressure of CO2, and total CO2 for the 308-d lactation. Buffer tended to increase DMI and increased milk protein throughout lactation. During 0 to 56 d postpartum, sodium sesquicarbonate did not affect milk yield or composition. In midlactation (56 to 252 d postpartum), buffer increased milk protein content only. During 252 to 308 d postpartum, milk fat and protein contents increased with buffer supplementation. Hence, the value of milk yielded daily was similar for all cows. Effects of dietary buffer on all variables were more pronounced during late lactation.

Key Words: sodium sesquicarbonate • milk yield • blood • acid-base

Submitted on August 9, 1993
Accepted on May 3, 1994




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