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Journal of Dairy Science Vol. 55 No. 7 931-934
© 1972 by American Dairy Science Association ®
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Iodine Intake Related to Milk Iodine and Performance of Dairy Cattle1

R. W. Hemken2, J. H. Vandersall, M. A. Oskarsson and L. R. Fryman3

Dairy Science Department, University of Maryland, College Park 20740

ABSTRACT

Sixteen cows were fed corn silage and a concentrate mixture of corn, barley, soybean meal, and minerals starting 6 to 8 weeks prior to calving. The cows were divided into two groups and received either 6.8 or 68.0 mg of supplemental iodine daily starting at 7 to 11 weeks following calving. There were no significant differences in feed intake, milk production, milk fat content, or body weight changes during the experimental period. Milk samples from 4 cows on each iodine level and from 4 COWS receiving no supplemental iodine had significant differences in milk iodine. No iodine supplementation resulted in in µg I/liter which is evidence a deficiency compared With 81 and 694 µg I/liter for the 6.8 and 68.0 mg of I feeding.

Eighteen calves were fed a ration with about 4m of the dry matter as soybean meal. Three amounts of supplemental iodine (none, 1.1, and 6.8 mg daily) did not produce any differences in growth rate.

Feed and milk samples were obtained for iodine analysis from farms in Northern Illinois and Maryland. Differences due to location were large for forage samples. Corn silage saniples were consistently lower in iodine content than hay samples collected from the same farm. No evidence of iodine deficiency based on iodine of milk was noted.

FOOTNOTES

1 University of Maryland Scientific Article A 1737, Contribution 4515 of the Maryland Agricultural Experiment Station.

2 Present address: Department of Animal Science, University of Kentucky, Lexington. 40506

3 Dairy Science Department, University of Illinois, Urbana.






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