alexa Influence of time of feeding a protein meal on ruminal fermentation and forestomach digestion in dairy cows.


Research & Reviews: Journal of Chemistry

Author(s): Robinson PH, Gill M, Kennelly JJ

Abstract Share this page

Abstract Four ruminally and duodenally cannulated dairy cows in midlactation were fed twice daily a mixed diet of alfalfa silage and whole-crop oat silage and a concentrate consisting of primarily barley grain. A high protein supplement was fed at approximately 15\% of the estimated dry matter intake of the mixed diet once daily at 0830 h, 0.5 h after the morning meal (day), or at 0030 h, 7.5 h after the evening meal (night). Cows fed the protein supplement during the night had higher apparent forestomach digestion of organic matter and crude protein. Ruminal concentrations of all volatile fatty acids, except isobutyrate, were higher for cows fed the protein supplement during the night. Although ruminal pH and concentrations of ammonia N did not differ between treatments, time by treatment interactions indicated that the feeding times of the protein supplement influenced diurnal patterns of ruminal fermentation. The flow of nonbacterial nonammonia N at the duodenum, as a proportion of N intake, was lower for cows fed the protein supplement during the night, but production of milk fat was higher. Results were consistent with a mechanism whereby protein fed during the night stimulated ruminal fermentation, particularly during the night, resulting in greater forestomach digestion of organic matter and less escape of dietary protein from the forestomach. Clearly, the different feeding times of this protein supplement changed the nutritional value of the overall diet. This article was published in J Dairy Sci and referenced in Research & Reviews: Journal of Chemistry

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

  • 5th Global Chemistry Congress
    September 04-06, 2017 London, UK
  • Annual Chemistry Meeting
    September 07-09, 2017 Macau, Hong Kong
  • 2nd International Conference on Applied Chemistry
    October 16-17, 2017 Toronto, Canada
  • 6th Global Congress on Mass Spectrometry
    October 19-20, 2017 Osaka, Japan
  • 2nd International Conference and Exhibition on Polymer Chemistry
    November 06-08, 2017 Chicago, USA

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version