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Dairy Husbandry Subsection
Dairy Industry Section, Iowa Agricultural Experiment Station, Ames
ABSTRACT
The Iowa dairy industry long has been troubled with the development of oxidized and other undesirable flavors in milk. Since soybeans are the chief source of home-grown protein in Iowa, some of these flavors were attributed to soybean feeding. Creamery operators of the state continually reported that they were receiving milk and cream which had what was described as a "soybean" flavor.
Earlier work at this station (4, 5, 6, 12, 13) showed no indications of milk off-flavors when soybeans were fed in the usual amounts. Similar results were obtained by other workers (2, 7, 8, 9, 10). However, since soybeans have been indicated to increase the proportion of unsaturated fatty acids in butterfat, and since a number of farmers occasionally transport their milk in rusty tin cans, it was felt that the exposed surface of the iron might act as a catalyst aiding in the oxidation of the unsaturated fatty acids, thus resulting in oxidized flavors.
An experiment was set up to compare the milk from a group of cows fed cracked soybeans in amounts usually used by Iowa dairymen with that of another group fed similar amounts of linseed oil meal.
1 Journal paper No. J1677 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 692.
2 Present address: Kansas State College, Manhattan.
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