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Production and Growth of Dairy Cows Reared on Silage or Hay Rations

Animal Husbandry Research Division, USDA, Beltsville, Md.

ABSTRACT

Butterfat, milk production, and body weights of heifers reared on hay or alfalfa silage rations were compared. Those reared on silage, with resulting smaller size at 2 yr. of age, produced somewhat less butterfat and milk during the entire first lactation than did the heifers reared on hay or hay and silage. These differences were not statistically significant. At later ages, the heifers reared on silage had nearly the same body weights as those reared on hay rations.