Pentadecanoic acid
Encyclopedia
Pentadecanoic acid is a saturated fatty acid. Its molecular formula is CH3(CH2)13COOH.

The butterfat
Butterfat
Butterfat or milkfat is the fatty portion of milk. Milk and cream are often sold according to the amount of butterfat they contain.- Composition :The fatty acids of butterfat are typically composed as follows :...

 in cows milk
Milk
Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to the baby and can reduce the risk of many...

is its major dietary source
and it is used as a marker for butterfat consumption.

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