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Journal of Dairy Science Vol. 56 No. 3 375-377
© 1973 by American Dairy Science Association ®
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Effect of Roughage Restriction on Serum Insulin in the Dairy Cow

C. K. Walker1 and J. M. Elliot

Department of Animal Science, Cornell University, Ithaca, New York 14850

ABSTRACT

Serum immunoreactive insulin was measured at intervals during lactation in cows consuming restricted roughage or control rations. At 16 weeks postpartum when milk fat depression was greatest, serum immunoreactive insulin was higher in the restricted roughage group. In general there was a negative relationship between serum immunoreactive insulin and milk fat production and percentage. Within treatment, however, such relationships were consistently negative on restricted roughage ration but either nil or positive on control ration. Rumen acetate:propionate ratios were negatively correlated with serum immunoreactive insulin.

FOOTNOTES

1 Present address: Department of Animal and Veterinary Sciences, University of Maine, Orono 04473.






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Copyright © 1973 by the American Dairy Science Association ®.