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Short Communication: Effects of a Monensin Premix on Milk Fatty Acid Content During Subacute Ruminal Acidosis in Dairy Cows

T. Mutsvangwa^*, J. K. G. Kramer, C. B. Blackadar, T. F. Duffield, R. Bagg^||, P. Dick^||, G. Vessie^|| and B. W. McBride^*

^* Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
Food Research Program, Agriculture and Agri-Food Canada, Guelph, ON, Canada N1G 5C9
Department of Population Medicine, University of Guelph
^|| Elanco Animal Health/Provel Division, Eli Lilly Canada Inc., Research Park Centre, Guelph, ON, Canada N1G 4T2

Corresponding author: B. W. McBride; e-mail: bmcbride{at}uoguelph.ca.

The effects of a monensin premix on milk fatty acid content during grain-induced subacute ruminal acidosis (SARA) in Holstein cows receiving a total mixed ration was investigated. Six multiparous, rumen-fistulated Holstein cows were used in a two-treatment, two-period crossover design with 6-wk periods. Experimental treatments were either a monensin premix or a placebo premix. At the beginning of wk 4, SARA was induced in experimental cows for a 10-d period using a grain challenge model. The administration of a monensin premix elevated milk fat proportion of total short-chain saturated fatty acids (sum of C₄ to C₁₅). Milk fat proportions of conjugated linoleic acid isomers were unaffected. Linolenic acid (C_18:3n3) proportion in milk fat of monensin-treated cows were lower when compared with placebo-treated cows during the SARA period. Results from this study indicate that dietary supplementation with monensin during SARA had little effect on milk fatty acid content.

Key Words: dairy cow • monensin • ruminal acidosis • milk fatty acids

Abbreviation key: FA = fatty acids, PUFA = polyunsaturated fatty acids, SARA = subacute ruminal acidosis, SCSFA = short-chain saturated fatty acids

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