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Unidentified Dietary Factors in Dairy Cattle Nutrition. III. The Nutritive Value of Immature Alfalfa and Timothy Hays for Milk Production¹

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

ABSTRACT

Most of the information regarding the change in the nutritive value of legume and grass hays associated with the advance in maturity is based on chemieal analyses and digestion trials. Woodman et al. (22) reported that all of the concentrates in the ration were satisfactorily replaced by immature grass for milk production. Newlander (18) replaced 5 lb. of hay with 4 lb. of artificially dried young grass in a ration which contained corn silage and grain and found that milk production was in f avor of the young grass, although the number of pounds of fat-corrected milk (F.C.M.) per 100 lb. of total digestible nutrients (T.D.N.) was not altered significantly. Camburn (3) replaced the grain in a hay-corn silage-grain ration with young grass and found that when body weight and milk production were considered, the T.D.N. in dried grass were equal to or slightly better than the T.D.N. in the grain.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal article no. 1383.