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Cereal-Grain Screenings Produced in the Pacific Northwest as a Feed for Lactating Dairy Cows^{1, 2, 3,}

Department of Dairy Science, State College of Washington, Pullman

ABSTRACT

Screenings are being used by dairymen and livestock feeders as a partial or a complete substitute for the concentrate ration. Screenings are used in grain-producing and surrounding regions because of their low cost.

There is good reason to question the use of screenings as a substitute for part or all of the concentrate ration because of: (a) their extreme variability in composition; (6) their frequently high crude fiber and ash content; (c) their frequently high content of weed-seeds, possible low nutritive value, and danger of weed propagation.

Dunsmore (3) fed various grades of wheat screenings to steers and dairy cattle. In these trials, recleaned elevator screenings proved to be equal to a good mixed meal for fattening steers. Recleaned elevator screenings proved valuable when composing one-third of the meal ration. Until the animals became accustomed to the change, however, screenings were unpalatable because of weed-seeds.

For lamb fattening, Linfield (4) found that a ration of lucerne and mixed grain or screenings, with or without beet pulp, was the most profitable of several rations fed.

¹ Scientific Paper No. 1536, Washington Agricultural Experiment Station, Pullman. Project 787.

² These data were taken in part from a thesis presented by the senior author to the faculty of the State College of Washington, in partial fulfillment of the requirements for the Master of Science degree.

³ The mixed cereal-grain screenings used in this trial were furnished by the Washington Co-operative Farmers' Association.

⁴ Now at Cornell University, Ithaca, New York.