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Effect of Sodium Bicarbonate and Magnesium Oxide in an Alfalfa-Based Total Mixed Ration Fed to Early Lactating Dairy Cattle¹

Utah State University, Logan 84322

ABSTRACT

Forty-eight lactating Holstein cows were fed a total mixed ration of 57% concentrate and 43% forage (dry basis) for 12 wk postpartum. Treatments consisted of 1) no added buffers, 2) .4% MgO, 3) .8% NaHCO₃, and 4) .8% NaHCO₃ plus .4% MgO of the total ration DM. Body weight, DM intake, and milk yield and composition were unaffected by treatment. Gross efficiency of milk production was decreased by the addition of NaHCO₃ or MgO. Buffer supplementation had no effect on ruminal volatile fatty acid concentration or blood chemistries.

¹ This paper is published with the approval of the Director, Utah Agricultural Experiment Station, Utah State University, Logan, as Journal Paper Number 3341.

² Department of Animal, Dairy, and Veterinary Sciences.

³ United States Department of Agriculture, Agricultural Research Service.

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