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Journal of Dairy Science Vol. 80 No. 1 160-166
© 1997 by American Dairy Science Association ®
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A Blend of Animal and Cereal Protein or Fish Meal as Partial Replacement for Soybean Meal in the Diets of Lactating Holstein Cows

C. E. Polan 1, G. Cozzi 2, P. Berzaghi 2, and I. Andrighetto 2

1 Department of Dairy Science, Virginia Agricultural Experiment Station, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315
2 Department of Animal Science, University of Padova, Padova, Italy

Six replications in Experiment 1 and four replications in Experiment 2 of a 3 x 3 Latin square arrangement of treatments were used to compare soybean meal or soybean meal partially replaced with fish meal or a protein blend for response in intake, milk yield and composition, ruminal NH3 N, blood urea, and ruminal fermentation in lactating Holstein cows. The blend contained 30% corn gluten meal, 30% poultry by-products, 30% blood meal, and 10% feather meal. Periods were 28 d, and the first 7 d were used for adjustment. In addition to these protein sources, diets contained corn silage, alfalfa haylage, dried cracked corn, ground barley plus added fat, and a mineral and vitamin mixture.

In Experiment 1, mean DMI was 24.4 kg, mean milk yield was 36.7 kg, mean fat percentage was 3.48%, and mean milk protein percentage was 3.06%; there were no significant differences. In Experiment 2, DMI was different for soybeans (22.6 kg) versus other sources (21.4 kg), but milk yield (32.1 kg) and fat (3.39%) and protein (2.87%) percentages did not differ among diets. In Experiment 1, ruminal NH3 N was greatest for cows consuming soybean diets (11.0 mg/dl) and lowest for cows consuming diets containing the protein blend (8.7 mg/dl). No differences in VFA were found. The lack of response to RUP can be explained by a rather high intake of a fermentable diet, which supplied sufficient absorbable AA according to the Cornell AA model.

Key Words: undegraded protein • lactating cows • protein sources • milk composition

Submitted on October 24, 1995
Accepted on April 26, 1996




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Copyright © 1997 by the American Dairy Science Association ®.