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The Effect of Phosphoric Acid Silage on the Acid-Base Balance in Dairy Cows

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Three experiments involving a total of twelve animals are reported in which the changes in the acid-base relations in the blood and urine were studied with cows receiving phosphoric acid silage with and without hay or limestone. No changes in the blood or urine were observed, as compared with the data on a ration including corn and molasses silage, when the phosphoric acid silage was supplemented with either hay or limestone. The feeding of phosphoric acid grass silage alone resulted in marked urinary changes indicating acidosis but was without effect on the alkaline reserve of the blood. Three of the four animals developed an unthrifty condition when fed the silage alone. This condition was relieved and the urine values were brought back to normal by the addition of either hay or limestone. It is concluded that the phosphoric acid grass silage is a satisfactory feed for dairy cows when it is supplemented with hay containing an appreciable amount of legume or with limestone.