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Journal of Dairy Science Vol. 73 No. 2 453-462
© 1990 by American Dairy Science Association ®
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Expeller Soybean Meal and Corn By-Products Versus Solvent Soybean Meal for Lactating Dairy Cows Fed Alfalfa Silage as Sole Forage

Glen A. Broderick 1, D. Bradford Ricker 1, and L. Spence Driver 1

1 US Dairy Forage Research Center, USDA-Agricultural Research Service and Department of Dairy Science, University of Wisconsin, 1925 Linden Drive West, Madison 53706

Production responses obtained with supplemental protein from expeller soybean meal or corn by-products, relative to solvent soybean meal, were determined in three replicated 4 x 4 Latin square trials. Dietary forage (54 to 58% of DM) was solely alfalfa silage containing 30 to 55% DM and 21% CP (DM basis). Main concentrate ingredient was either ground shelled or high moisture corn; diets were fed as total mixed rations. In Trials 1 and 2, supplements were: control (0 CP), .6x (60% of the supplemental CP of the 1x treatment) solvent soybean meal, .6x expeller soybean meal, and 1x solvent soybean meal. In Trial 1 (DM intake = 24.4 kg/d), supplement had no effect on production but increased weight gain; expeller soybean meal increased production of milk and lactose relative to either amount of solvent meal. In Trial 2 (DM intake = 20.0 kg/d), supplement increased production of milk and milk components; milk production on .6x expeller soybean meal was greater than .6x solvent soybean meal. In Trial 3 (DM intake = 22.4 kg/d), distillers dried grains plus corn gluten meal replaced .6x solvent soybean meal; supplement increased production of milk, 3.5% FCM, protein, and fat with no difference among the three proteins. Across all three trials, response to supplemental protein appeared to decrease with increased DM intake. Results indicate that resistant protein from expeller soybean meal and corn by-products can replace greater amounts from solvent soybean meal, and suggest that, despite high dietary CP, absorbed protein supply may be inadequate when alfalfa silage is the sole forage.

Key Words: alfalfa silage • resistant proteins • expeller soybean meal

Submitted on February 6, 1989
Accepted on August 24, 1989




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