Steam-Flaked Soybeans in Dairy Cattle Diets

<p>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.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis - University Access Only

Discipline thesis:degree_discipline

Dairy Science

Year dc:date.available

2011

Author dc:creator

• Bruns, Heidi R.

Contributors dc:contributor

• Arnold R. Hippen

• Dairy Science

Statement dc:rights

• <p>In Copyright - Non-Commercial Use Permitted<br /><a href="http://rightsstatements.org/vocab/InC-NC/1.0/">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>

Language dc:language

en

Repository record dc:identifier

https://openprairie.sdstate.edu/etd/1536

OAI identifier oai:identifier

oai:openprairie.sdstate.edu:etd-2541