[Liver exocrine function and lipid metabolism in the digestive tract of calves]

In cattle, the greatest amount of bile was secreted in the foremilk period. The bile secretion level, liver-intestine transport, and lipid consumption decreased till 90 days of age then got stabilized, whereas the liver-intestine transport of bile acids augmented up to 180 days of age. The lipid concentration in the bile and the latter's lipolytic activity are closely related and both of them increase after transition from monogastric to polygastric type of digestion. The lipids absorption in the intestine and their digestion coefficient in 1 month-old cattle are, respectively: 88.0 and 99.6%; in 3 months: 75.7 and 61.3%; in 6 months: 71.7 and 59.1%; whereas the level of hepato-enteral circulation of lipids is, respectively: 8.2%; 10.5%; 14.5% of their absorbed amount.