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![](https://webarchive.library.unt.edu/eot2008/20090509213102im_/http://www.ars.usda.gov/incme/images/Research_head.gif) |
Research Project:
Post-Approval Study: Effect of Rumensin on Ruminal Microbial Profiles in Lactating Dairy Cattle under Conditions of Milk Fat Depression
Project Number: 3655-21000-046-03
Project Type:
Trust
Start Date: May 01, 2007
End Date: Mar 31, 2009
Objective:
1) To identify cows that display strong, intermediate, & weak degrees of milk fat depression when switched from a high-fiber to high-starch diet. 2) To determine production response & ruminal chemistry of these cows fed a high-starch diet before & after Rumensin feeding, & after Rumensin withdrawal. 3) To identify (using molecular techniques) the specific uncultured bacterial species whose ruminal populations change in response to Rumensin feeding and withdrawal.
Approach:
We will identify & group dairy cows by degree of milk fat depression on high-starch diets. We will use culture-independent molecular techniques to characterize rumen bacterial community structure in cows on a high-starch diet before & after Rumensin feeding, and after Rumensin withdrawal. Changes in milk production & composition will be associated with changes in specific bacterial subpopulations.
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Last Modified: 05/08/2009
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