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A Study of the Relation of the Feed Consumed by the Cow to the Composition of Milk Fat and the Properties of Butter

O. J. Hill and L. S. Palmer

Divisions of Agricultural Biochemistry and Dairy Husbandry, University of Minnesota, University Farm, St. Paul

ABSTRACT

The fact that cows can produce butterfat from rations low in ether extract has been shown by Jordan and Jenter (1), Hills (2), Lindsey (3) and Buschmann (4). Hansson and Olofsson (5) and Magi (6) have reported hard butter following winter feeding with hay and grain. Hansen and Stensberg (7) classified oats with the feeds producing normal butter and barley in the group producing hard butter. Many workers present data concerning the influence of feed consumed by the cow on the composition of butterfat. Few studies have been conducted to determine the relationships between observed changes in butterfat composition and its hardness due to feeding practice.

EXPERIMENTAL METHODS

Seven-day feeding periods were used except for part of the oil feeding trials in which six days were used. Although samples were taken at the end of each period, the roughage feeding was extended through two or more periods in order to allow time for the animals to reach equilibrium.

This paper represents a portion of the thesis presented by O. J. Hill in partial fulfillment of the requirements for the degree of Doctor of Philosophy, University of Minnesota. Published with the approval of the Director as Paper No. 1600 Journal series, Minnesota Agricultural Experiment Station.

Now at Washington State College, Pullman, Washington.