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Document Type
Thesis - University Access Only
Award Date
2011
Degree Name
Master of Science (MS)
Department
Dairy Science
First Advisor
Arnold R. Hippen
Abstract
There are many forms of soybeans available and fed within the livestock industry including: raw soybeans, extruded soybeans, roasted soybeans, steam-flaked soybeans and several soybean meal varieties. While most of these soybean products have been extensively researched and evaluated as feedstuffs, there is almost no research regarding steam-flaked soybeans. This series of research evaluated the feeding properties of steam-flaked soybeans in lactating dairy cattle. One component of the investigation was an in situ study that evaluated the rumen degradability and intestinal digestibility of steam-flaked soybeans. A second component of this research investigated the effect of particle size on rumen degradabi1ity parameters of steam-flaked soybeans. Finally, the third constituent of this research was a feeding trial where steam-flaked soybeans were included in the diet of lactating dairy cattle at 0%, 5%, 10% and 15% of dietary dry matter. This research demonstrated that steam-flaked soybeans, when ground to 2-mm, have similar rumen degradability to solvent extracted soybean meal and greater overall digestibility than raw soybeans. We also observed that using whole steam-flaked soybeans, as opposed to ground steam-flaked soybeans, increases the rumen undegradable portion of protein and dry matter. Furthermore, it was demonstrated that steam-flaked soybeans, fed to lactating dairy cattle at 15% of dietary dry matter, can replace a mixture of soybean meal and commercial fat sources while maintaining production of milk (42 kg/d), milk fat (3.6%), and milk protein (3.0%). Increasing the amount of steam-flaked soybeans in the diet increased the amount of saturated and polyunsaturated fatty acids in milk fat indicating that steam-flaked soybeans may lead to more complete biohydrogenation as well as being a source of rumen protected fat.
Library of Congress Subject Headings
Dairy cattle -- Feeding and feeds
Soybean as feed
Description
Includes bibliographical references (pages 82-89)
Format
application/pdf
Number of Pages
100
Publisher
South Dakota State University
Rights
In Copyright - Non-Commercial Use Permitted
http://rightsstatements.org/vocab/InC-NC/1.0/
Recommended Citation
Bruns, Heidi R., "Steam-Flaked Soybeans in Dairy Cattle Diets" (2011). Electronic Theses and Dissertations. 1536.
https://openprairie.sdstate.edu/etd/1536