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Journal of Dairy Science Vol. 75 No. 8 2235-2241
© 1992 by American Dairy Science Association ®
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Effects of Lasalocid on Selected Ruminal and Blood Metabolites in Young Calves

J. D. Quigley III 1, S. I. Boehms 2, T. M. Steen 2, and R. N. Heitmann 2

1 Department of Animal Science, University of Tennessee, Knoxville 37901-1071
2 Department of Animal Science, University of Tennessee, Knoxville 37901-1071

Twelve Holstein bull calves were ruminally cannulated at 5 d of age and assigned to 0 or 1 mg of lasalocid/kg of BW daily, administered postruminally via milk replacer or into the ruminal cannula. Calves were fed milk replacer for 8 wk and calf starter for 12 wk. Lasalocid administration was terminated at weaning in calves fed lasalocid in milk replacer. Ruminal pH tended to be higher in calves fed lasalocid ruminally than in calves on control treatment and averaged 5.9 and 5.6 and 5.4 and 5.1 during wk 1 to 8 and 9 to 12, respectively. Molar proportion of ruminal butyrate tended to be lower when lasalocid was added to the rumen, particularly after weaning. Blood ß-hydroxybutyrate and acetoacetate were lower when lasalocid was administered into the rumen after weaning and averaged .897 and .646 and .026 and .015 mM in calves on control and ruminal treatments, respectively. No effects of lasalocid administered via the milk replacer were observed, except for plasma NEFA, which were reduced postweaning. These data suggest that lasalocid reduces blood ß-hydroxybutyrate by changes in ruminal fermentation and subsequent metabolism of butyrate by ruminal epithelium.

Key Words: calves • lasalocid • ketones • ruminal development

Submitted on January 31, 1992
Accepted on April 6, 1992




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Copyright © 1992 by the American Dairy Science Association ®.