Microbial populations and fermentation profiles in rumen liquid and solids of Holstein @entity291 respond differently to dietary XXXX processing.

@entity6852 @entity4876 @entity2247 @entity4919 @entity39989 @entity2348 @entity23838 @entity880 @entity8294 @entity1718 @entity291 @entity15898
AIMS: To evaluate the effects of treating @entity2247 grain with @entity880 (LA) and heat on postprandial dynamics of 19 microbial taxa and fermentation in the rumen of dairy @entity291 . METHODS AND RESULTS: This study was designed as a double 3 * 3 Latin square with 6 rumen-cannulated @entity291 and three diets either containing untreated control @entity2247 or @entity2247 treated with 1% LA and 1% @entity23838 ( @entity23838 , 55  C). Microbial populations, pH and volatile @entity1718 were assessed in rumen liquid and solids during the postprandial period. @entity4919 increased and @entity4876 decreased in rumen solids of @entity291 fed LA and @entity23838 treated @entity2247 compared to the control @entity2247 . The LA but not @entity23838 treatment depressed @entity15898 in rumen liquid and solids, whereas the opposite effect was observed for @entity8294 in both fractions and @entity39989 in rumen solids. LA promoted Ruminobacter amylophilus with the effect being more pronounced with @entity23838 . The Lactobacillus group and @entity6852 increased in both fractions with LA but not with @entity23838 . CONCLUSIONS: LA and @entity23838 treatment of @entity2247 differently altered ruminal abundance of certain @entity2348 and increased @entity4919 fermentation in rumen solids, whereby LA and @entity23838 effects were consistent and mostly independent of the rumen fraction and time after @entity2247 feeding. SIGNIFICANCE AND IMPACT OF THE STUDY: Results provided evidence that LA and @entity23838 treatment of @entity2247 can enhance rumen @entity4919 fermentation without adversely affecting rumen pH. As @entity4919 is the major contributor to gluconeogenesis in ruminants, the present @entity2247 treatment may have practical application to enhance energy supply in dairy @entity291 . This article is protected by copyright. All rights reserved.
