JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Interpretive Summary
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Harvatine, K. J.
Right arrow Articles by Allen, M. S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Harvatine, K. J.
Right arrow Articles by Allen, M. S.
J. Dairy Sci. 89:1092-1103
© American Dairy Science Association, 2006.

Effects of Fatty Acid Supplements on Ruminal and Total Tract Nutrient Digestion in Lactating Dairy Cows

K. J. Harvatine1 and M. S. Allen2

Department of Animal Science, Michigan State University, East Lansing 48824-1225

2 Corresponding author: allenm{at}msu.edu

Saturated and unsaturated fatty acid supplements (FS) were evaluated for effects on ruminal digestion kinetics, and ruminal and postruminal nutrient digestion. Eight early lactation ruminally and duodenally cannulated cows (77 ± 12 days in milk, mean ± SD) were used in a replicated 4 x 4 Latin square design experiment with 21-d periods. Treatments were control and a linear substitution of 2.5% fatty acids from supplemented saturated FS (SAT; prilled, hydrogenated free fatty acids) for partially unsaturated FS (UNS; calcium soaps of long-chain fatty acids). All rations contained identical forage and concentrate components including 37.2% forage and 13.5% cottonseed. Saturated FS linearly decreased ruminal digestibility of dry matter and organic matter and linearly decreased ruminal neutral detergent fiber (NDF) digestibility. The reduction in ruminal NDF digestibility was because of a linear decrease in digestion rate and a linear increase in passage rate of potentially digestible NDF with increasing saturated FS. Total tract digestibility of NDF was not different between treatments because of compensatory postruminal digestion. Ruminal fatty acid and C18 fatty acid digestibility tended to increase linearly with increasing unsaturated FS, and postruminal C18 fatty acid digestibility decreased with increasing saturated FS. Saturated FS linearly decreased ruminal organic matter digestibility and decreased intestinal long-chain fatty acid digestibility, although differences in fatty acid digestibility may be partially explained by fatty acid intake.

Key Words: fatty acid • site of digestion • digestion kinetics • NDF digestion




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
B. J. Bradford, K. J. Harvatine, and M. S. Allen
Dietary Unsaturated Fatty Acids Increase Plasma Glucagon-Like Peptide-1 and Cholecystokinin and May Decrease Premeal Ghrelin in Lactating Dairy Cows
J Dairy Sci, April 1, 2008; 91(4): 1443 - 1450.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
K. J. Harvatine and M. S. Allen
Effects of Fatty Acid supplements on milk yield and energy balance of lactating dairy cows.
J Dairy Sci, March 1, 2006; 89(3): 1081 - 1091.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
K. J. Harvatine and M. S. Allen
Effects of Fatty Acid supplements on feed intake, and feeding and chewing behavior of lactating dairy cows.
J Dairy Sci, March 1, 2006; 89(3): 1104 - 1112.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2006 by the American Dairy Science Association ®.