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The Digestibility and Feeding Value of Russian Thistle Hay¹

Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

The Russian thistle hay used in these tests contained 62.1 per cent as much total protein, 55.2 per cent as much digestible protein, and 80.5 per cent as much total digestible nutrients as did the alfalfa hay used in the feeding trial.

Ground Russian thistle hay may be used with fairly satisfactory results to furnish 40 to 45 per cent of the protein and total digestible nutrients of a dairy cow's ration.

Alfalfa hay is a more satisfactory roughage for milk production than is Russian thistle hay. The thistle hay is much less palatable than is alfalfa hay and must be ground.

Russian thistle hay in the ration of dairy cows causes no appreciable off flavors or odors in the milk produced.

¹ Contribution No. 103, Department of Dairy Husbandry, and No. 194, Department of Chemistry.