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Journal of Dairy Science Vol. 40 No. 5 541-545
© 1957 by American Dairy Science Association ®
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Variation in Plasma Protein-Bound Iodine Levels in Dairy Cattle Due to Animal, Daily, Diurnal, and Method Effects1

H. D. Lennon, Jr. and J. P. Mixner

New Jersey Agricultural Experiment Station, Sussex, N. J.

ABSTRACT

The level of plasma protein-bound iodine (PBI) has become an important index of thyroid function in the human (8, 10, 12), but its usefulness in dairy cattle has not become established. One reason for this is the lack of a recognized, well-defined syndrome involving the thyroid. Also, it is not feasible to compare routinely the level of plasma PBI with any other established measure of thyroid activity, such as basal metabolic rate. Therefore, an evaluation of the usefulness of plasma PBI levels in dairy cattle (as a measure of thyroid activity) must be based primarily on its relation to the physiological status of the animal, particularly on its relation to productive and reproductive characteristics.

Several investigators have reported on the normal ranges of plasma PBI values for various age groups of cattle (5, 6, 7), breed differences (5, 7, 9), seasonal trends (1, 5), and the relationship between plasma PBI level and certain measures of growth (3).

FOOTNOTES

1 Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, the State University of New Jersey, Department of Dairy Industry, New Brunswick. This research was supported in part by Research and Marketing Funds (Sec. 10b) of the Agricultural Research Service, Dairy Husbandry Research Branch, U. S. Department of Agriculture.






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Copyright © 1957 by the American Dairy Science Association ®.