Biochemical concomitants of hunger and satiety were determined in dairy heifers and lactating cows. Two lactating Holstein cows were fed 5.45 kg grain and hay ad libitum once daily for a 6-hr period. Jugular blood and rumen samples were taken before feeding and at 2, 4, 6, 8, 12, 15, 20, and 24 hr thereafter. Rumen concentrations of acetate, propionate, butyrate, and valerate were increased (P
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Simkins et al. (1965) studied this question.
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