ORIGINAL PAPER
Effect of monensin on rumen fermentation and digestion and milk production in lactating dairy cows
 
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1
Centre for Dairy Research, Department of Agriculture, The University of Reading, PO Box 236, Reading, RG6 6AT, United Kingdom
2
Elanco Animal Health, a Division of Eli Lilly & Company, Greenfield, Indiana, 46140-0708, USA
Publication date: 2002-08-02
 
J. Anim. Feed Sci. 2002;11(3):399–410
 
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ABSTRACT
Four Holstein-Friesian dairy cows, fitted with ruminal and duodenal cannulas, were used to evaluate the effect of 0 and 300 mg/d monensin offered with a total mixed ration (TMR) on rumen fermentation, site of nutrient digestion, and milk yield and composition. Indigestible markers chromium EDTA and ytterbium acetate were ruminally infused and their concentration measured at the duodenum to determine digesta flow rates. Choice of method of processing digesta samples caused large differences in the variation in digesta flow calculations. Monensin increased rumen molar proportions (mmol/total mol) of propionic acid (214 vs 268) and reduced those of acetic (622 vs 583) and n-butyric acid (134 vs 119). The values recorded for monensin treated cows for nitrogen (N) digested in the rumen, flow of total N and non-ammonia N (NAN) to the duodenum and N voided in the faeces were 5.6, 6.1, 7.1 and 16.0% units lower compared with the control. Monensin decreased starch digestion in the rumen (9.4% units), increased starch flow to the duodenum (0.5 kg/d) but did not alter total tract digestion. Monensin had no significant effect on rumen or total tract digestion of organic matter (OM), acid detergent fibre (ADF) and nitrogen. Milk yield was increased numerically by 1.9 kg/d, and milk fat and milk protein contents were reduced by 3.9 and 1.5 g/kg, respectively, but yields of fat and protein were unaffected.
 
CITATIONS (7):
1.
Reproductive and Developmental Toxicology
Meliton N. Novilla
 
2.
Effects of Lasalocid or Monensin Supplementation on Digestion, Ruminal Fermentation, Blood Metabolites, and Milk Production of Lactating Dairy Cows
R. Martineau, C. Benchaar, H.V. Petit, H. Lapierre, D.R. Ouellet, D. Pellerin, R. Berthiaume
Journal of Dairy Science
 
3.
Effect of monensin feeding and withdrawal on populations of individual bacterial species in the rumen of lactating dairy cows fed high-starch rations
Paul J. Weimer, David M. Stevenson, David R. Mertens, Elvin E. Thomas
Applied Microbiology and Biotechnology
 
4.
Reproductive and Developmental Toxicology
Meliton N. Novilla, David McClary, Scott B. Laudert
 
5.
A randomized herd-level field study of dietary interactions with monensin on milk fat percentage in dairy cows
J. Dubuc, D. DuTremblay, M. Brodeur, T. Duffield, R. Bagg, J. Baril, L. DesCôteaux
Journal of Dairy Science
 
6.
Monensin supplementation of lactating cows fed tropical grasses and cane molasses or grain
B.C. Granzin, G. McL. Dryden
Animal Feed Science and Technology
 
7.
Greenhouse Gas, Animal Performance, and Bacterial Population Structure Responses to Dietary Monensin Fed to Dairy Cows
Scott Hamilton, Edward DePeters, Jeffery McGarvey, Jeremy Lathrop, Frank Mitloehner
Journal of Environmental Quality
 
ISSN:1230-1388