Regulation of food intake in ruminants. 3. Variation in blood and rumen metabolites in relation to food intake

Simkins, K.L.; Suttie, J.W.; Baumgardt, B.R.

Journal of Dairy Science 48(12): 1629-1634

1965


ISSN/ISBN: 0022-0302
DOI: 10.3168/jds.s0022-0302(65)88540-x
Accession: 014637168

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Abstract
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 and at 2, 4, 6, 8, 12, 15, 20, and 24 hr thereafter. Rumen concentrations of acetate, propionate, butyrate, and valerate were increased (P< .05) at 2 hr after feeding. Blood acetate concentration was directly proportional to rumen acetate concentration. Satiation occurred when blood and rumen volatile fatty acid (VFA) concentrations were at a maximum. Four heifers were fed a completely pelleted ration (60% corn, 40% alfalfa meal) ad libitum once daily for a 3-hr period. Jugular blood samples were taken before feeding and at 1.5, 3, 4.5, 7, 12, 16, and 24 hr thereafter. Blood sugar and plasma free fatty acid (FFA) concentrations were significantly (P<.01) decreased at 1.5 hr after food intake. Blood acetate and ketone concentrations increased (P< .01) after feeding.