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Implications of Unique Features of Blood Transport in the Lactating Cow

School of Public Health, University of California, Los Angeles 90024

ABSTRACT

Historical Aspects

Since the early part of this century, dairy scientists have been measuring blood lipids in lactating bovines with the hope of gaining insight into their utilization in the synthesis of milk fat. In one of their classic papers in 1924, Gage and Fish (12), after feeding a cow 250 g of butter, observed chylomicra in the animal's blood. Chylomicra transport triglycerides (composed primarily of dietary fatty acids) from the intestinal mucosal cells into the circulation. These investigators reported that Sudan dyes incorporated into dietary fat were not secreted in bovine milk, although such studies on goats and on monogastric animals (cats, dogs, and rats) gave positive results. Maynard and McCay in 1929 (29) reported the amounts of fat in both milk and blood changed directly in relation to its content in the feed. Subsequently, in 1931, Maynard and co-workers (30) demonstrated that blood lipids decreased prior to parturition and then began to increase again during lactation.

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