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Feed Processing. VI. Comparison of Starea, Urea, and Soybean Meal as Protein Sources for Lactating Dairy Cows^1,2,

Departments of Dairy and Poultry Science, and Grain Science and Industry, Kansas State University, Manhattan 66502

ABSTRACT

Milk production, grain intake, body weight change, and the production and concentration of milk constituents were criteria to evaluate Starea (an intimate mixture of gelatinized starch and urea) as a protein supplement for lactating dairy cows. Cows fed grain rations supplemented with either soybean meal or Starea (23% crude protein) consumed more grain and produced more milk containing more protein than cows fed the same grain ration supplemented with urea. Starea was approximately equal to soybean meal as a protein supplement for lactating cows.

¹ Contribution no. 779, Department of Dairy and Poultry Science, and no. 716, Department of Grain Science and Industry, Kansas Agricultural Experiment Station, Manhattan 66502.

² Supported in part by a grant from W. E. Grace & Co., New York.