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Urea as a Protein Extender for Lactating Cows¹

Departments of Dairy and Agricultural Chemistry, Michigan State College, East Lansing

ABSTRACT

Various protein supplements have been used to balance the roughage ration of farm mammals to secure economical gains and efficient nfilk production. In recent years the use of urea as a protein extender has been given considerable emphasis. The literature eOllcerning the utilization of urea by ruminants has been reviewed by Reid (7); however, subsequent to the preparation of the review, Thompson et al. (11) reported that urea and cottonseed meal were of comparable value for milk production under the conditions of their experiment.

The object of the experiment reported here was to compare the milk-producing value of a low protein roughage ration supplemented with (a) corn and urea and (b) soybean oil meal, and also to observe the effectiveness of the nitrogen supplement when fed by two different methods.

PROCEDURE

Ten cows (nine Holstein and one Guernsey) were fed a protein depletion ration consisting of chopped, seed-stage timothy hay, molasses, and ground corn for 12 days. The cows were then assigned to four groups; two groups of two, and two groups of three cows each.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1676.