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Field Observations on the Lipids of Cows with Depressed Milk Fat Test¹

Lipids Laboratory, Department of Dairy Science, Pennsylvania Agricultural Experiment Station, University Park

ABSTRACT

Since the early observations of Powell (16), showing that the diet could cause an adverse effect on milk fat percentage, considerable interest has been focused on the problem. Dry seasons during the last few years in the Northeast, and changes in feed handling for dairy cows have brought the situation even more to the forefront. Warner (22) has recently reviewed the conditions under which fat depression occurs; whereas, Van Soest (20) has reviewed the problem from a biochemical and physiological standpoint. The situation is unique in biological research. Shifts in the diet, often minor, which cause no apparent stress to the animal, selectively affect one constituent of milk. At the same time, these diet changes which cause the drop in milk fat yield favor the deposition of fat in adipose tissue throughout the rest of the animal body (4). Thus, the effect appears to be specific for mechanism involved in milk fat formation.

¹ Authorized for publication on December 17, 1965 as paper no. 3086 in the Journal Series of the Pennsylvania Agricultural Experiment Station.