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Bovine Protein-Bound Serum Iodine and its Relation to Age and Breed

Departments of Dairy Science, Surgical Research and Institute of Genetics, The Ohio State University, Columbus

ABSTRACT

Protein-bound serum iodine (PBI) determinations were performed on 116 dairy and beef cattle of the Ohio State University Herd and Veterinary Clinic.

It was found that the age of the animal has a pronounced influence on PBI. The younger the animal, in general, the higher the PBI.

The breed differences found show that the PBI value is affected by the genotype of the cattle. Significant and highly significant differences were found to exist between certain of the breeds. There were too few grade cattle included to allow for an interpretation of their probable genotypes. With the cattle studied, the breeds ranked from high to low as follows with regard to their average PBI: Jersey, Guernsey, Brown Swiss, Ayrshire, Holstein and beef breeds.

The large difference between the beef and dairy breeds is not attributed entirely to inheritance, since the possibility of all sizable environmental differences has not been ruled out.