Intraruminal loading with short chain fatty acids in the food-deprived goat
1991
Holtenius, K. (Sveriges Lantbruksuniv., Uppsala (Sweden). Inst. foer Djurfysiologi)
Four goats were fed, or deprived of food for one day in combination with intraruminal loads of water or short chain fatty acids (SCFA) buffered to pH 4.9 or 7.4 in a latin square design. The plasma concentration of acetate and sodium decreased due to food deprivation and the rumen fluid pH increased from 6.9 to 7.5. The transfer rate of acetate, the principal SCFA, from rumen to plasma was stimulated when the concentration of undissociated acetate was elevated by giving food deprived goats SCFA buffered to pH 4.9. The results indicate that the transport of acetate from rumen to plasma occurs mainly as undissociated acid. SCFA appear to stimulate sodium absorption even when the rumen fluid is slightly alkaline and the concentration of undissociated SCFA is low. It is therefore proposed that dissociated SCFA can stimulate the sodium absorption from the rumen and a model for this mechanism is proposed.
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