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Pelleting a Concentrate Mixture With and Without Prior Steaming for Lactating Cows^1,2,

Department of Animal Sciences, University of Hawaii, Honolulu 96822

ABSTRACT

Milk production, milk composition, fatty acid content of milk fat, rumen pH, and rumen metabolites were criteria for evaluation of pelleting the concentrate ration for 12 lactating Holstein cows. An incomplete block switchback design of 7-week periods (3-week changeover and 4-week comparison) was used. Animals went on trial approximately 10 weeks after parturition. Treatments were (1) meal concentrate, (2) meal concentrate pelleted, and (3) meal concentrate pelleted with prior steam treatment. Means from Treatments 1, 2, and 3 were: rumen metabolites (molar %) acetate, 49.4, 46.9, and 46.5; propionate, 29.0, 33.2, and 32.9; butyrate, 16.3, 14.4, and 14.9; acetate:propionate ratio, 1.77, 1.44, and 1.47; daily milk production, 17.8, 17.9, and 17.4 kg; 4% fat-corrected milk, 15.0, 13.7, and 13.4 kg; and milk fat, 2.98, 2.47, and 2.53%. Cows receiving the pelleted rations (Treatments 2 and 3) produced milk fat containing an average of 2.70% by weight less C₁₆ and 1.04% by weight more C⁼²₁₈ than did the control animals.

¹ Journal Series 1141 of the Hawaii Agricultural Experiment Station.

² Taken from data presented by the senior author to the Graduate Division of the University of Hawaii in partial fulfillment of the requirements for the M.S. degree.