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1 University of Guelph, Guelph, ON, Canada N1G 2W1
2 Provel, a Division of Eli Lilly, Inc, Research Park Centre, Guelph, ON, Canada N1G 4T2
Dry cows and pregnant heifers from 25 farms near Guelph, Ontario, Canada were enrolled in a large double-blind, randomized clinical trial that was designed to evaluate the impact of monensin on energy metabolism, health, and production. A total of 503 cows was given monensin in controlled-release capsules, and 507 were administered placebo capsules 3 wk prior to the expected calving date. The effects of treatment on milk production and milk components at the first three Dairy Herd Improvement (DHI) tests were evaluated using repeated measures analysis of variance. Treatment with monensin increased milk production, but this effect was dependent on body condition score prior to calving. Cows that were classified as thin (score of 
3.0) did not have increased production in response to monensin treatment. Cows with fair body condition (score of 3.25 to 3.75) produced significantly more milk at the second DHI test (+0.85 kg), but cows that were fat (score of 
4.0) produced significantly more milk than did controls for all three DHI tests (+1.25 kg) in early lactation. Monensin significantly increased projected 305-d milk production in cows from herds at increased risk of ketosis. Treatment with monensin had no significant effect on either milk fat percentage or milk protein percentage.
Key Words: monensin • dairy cows • milk production • milk components
Submitted on June 29, 1998
Accepted on October 15, 1998
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