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Journal of Dairy Science Vol. 80 No. 3 563-568
© 1997 by American Dairy Science Association ®
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Effect of Method of Delivery of Propylene Glycol on Plasma Metabolites of Feed-Restricted Cattle

Jens O. Christensen 1, Ric R. Grummer 1, Flemming E. Rasmussen 1, and Sandra J. Bertics 1

1 University of Wisconsin, Madison 53706

Methods of administering propylene glycol to reduce plasma nonesterified fatty acids (NEFA) during feed restriction of cattle were evaluated. Treatments were 1) no propylene glycol supplementation, 2) propylene glycol provided as an oral drench once per day, 3) propylene glycol mixed with concentrate and fed separately from forage, or 4) propylene glycol blended as part of the total mixed ration (TMR). Prior to or during feed restriction at 50% of ad libitum intake, propylene glycol was provided once daily at 2.5 ml/kg of body weight0.75. Prior to feed restriction, administration of propylene glycol as an oral drench or mixed with concentrate was more effective in increasing serum insulin than was feeding propylene glycol as part of the TMR. During feed restriction, administration of propylene glycol as an oral drench or mixed with concentrate resulted in higher serum insulin and lower plasma NEFA concentrations than did feeding propylene glycol as part of the TMR. Propylene glycol decreased the molar percentage of ruminal acetate and the ratio of acetate to propionate. Propylene glycol administered as an oral drench or mixed with concentrate and fed separately from forage appeared to be more effective than feeding propylene glycol as part of the TMR for influencing plasma NEFA in cattle during feed restriction.

Key Words: propylene glycol • insulin • nonesterified fatty acids • glucose

Submitted on February 26, 1996
Accepted on June 25, 1996




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