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Unidentified Dietary Factors in Dairy Cattle Nutrition. II. Further Evidence of an Unidentified Factor(s) in Grain Needed to Balance Roughage for Milk Production¹

Departments of Dairy and Agricultural Chemistry, Michigan Agricultural Experiment Station, East Lansing

ABSTRACT

Seventeen depleted cows were used in 25 trials to determine the effect of replacing part of the hay in an all-hay ration with grain and either wheat straw, oakwood meal or peanut hulls.

In all but one trial, the replacement of part of the hay with these feed stuffs resulted in an increase in 4 per cent F.C.M., even though the intakes of T.D.N., calculated net-energy and starch equivalent decreased and the crude fiber in the dry matter and ballast increased.

Crude fiber values up to 38 per cent of the dry matter did not depress milk production when the cows were changed from hay alone to a ration of hay, corn and peanut hulls.

The results of this investigation indicate that calculated net-energy and starch equivalent values of individual feeds are not additive, but that they support the modern concept of a balanced ration.

Further evidence is presented to show that the unidentified lactation factor (s) in grain is needed to improve the balance of roughages.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal article no. 1274.