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Comparison of a Protein Supplement and Shelled Corn for Dairy Cows on Good Pasture

Departments of Agronomy and Dairy Science, Virginia Agricultural Experiment Station, Blacksburg

ABSTRACT

Ground shelled corn and a simple grain mixture containing 20% total crude protein were compared as supplements for cows grazing good-quality pasturage during three seasons.

Daily FCM averaged 31.3 and 30.3 lb. for the corn and for the 20% protein groups, respectively. This difference was not statistically significant. Mean weekly persistency of production was 97.3% for the cows fed corn and 98.1% for the cows supplemented with the 20% protein mixture.

The average daily gain for the cows fed corn was 0.37 lb. compared with 0.12 lb. for the protein-supplemented cows.

Average daily concentrate consumption was slightly higher for the 20% mixture than for the ground corn. The intake of both supplements was higher during the first part of the grazing season than during the later part of the season.