Abstract
Summary A double-reversal experiment involving ten cows from the Cornell University Dairy Herd was used to detect the effect of the daily feeding of 1/2 lb. of sodium propionate on milk production, butterfat test, hay consumption, blood sugar and blood ketone levels. There were no significant differences (P In a supplemental experiment, two fistulated steers were fed propionate and control feed, and the fatty acid content of the rumen was determined at regular intervals after feeding. The feeding of the propionate feed resulted in higher levels of all the volatile fatty acids in the rumen for the first 3 hr. after feeding, particularly the propionic. From 3 to 9 hr. after feeding, the concentrations of rumen acids from the two feeds were quite similar. It was calculated that all of the administered propionate had disappeared in 7 hr., and most of it in 3 hr.
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