HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Kunkel, H. O. Articles by Lyman, C. M. Search for Related Content PubMed Articles by Kunkel, H. O. Articles by Lyman, C. M.

The Relationship of Serum Protein Bound Iodine Levels to Rates of Gain in Beef Cattle¹

Texas Agricultural Experiment Station^,3

Abstract

The serum protein bound iodine levels have been determined in a total of 54 beef calves, 8–11 months of age, in 3 feeding trials. These levels were compared to subsequent or concomitant feed lot gain.

The results indicate that groups of Hereford and Aberdeen Angus calves which show a wide variation in protein bound iodine exhibited a wide variation in rate of gain. In 10 individually fed Hereford bulls, a high correlation between efficiency of gain and this iodine level was evident. Under certain conditions a negative correlation between the level of protein bound iodine and feed lot gain was observed. A study of a group of Aberdeen Angus and Hereford bulls indicates that this negative correlation exists only in animals which have an optimal or higher level of protein bound iodine. A low level may be accompanied by lowered rates of gain.

¹ This investigation was conducted in cooperation with the Bureau of Animal Industry, United States Depaartment of Agriculture, as a part of the Southern Regional Beef Cattle Breeding Project S-10.

² The authors are deeply indebted to the Reid Brothers, Fort Davis, Texas, and Mr. Jack V. Williams, Paint Rock, Texas, for the loan of cattle for experimental purposes, to Dr. Bruce L. Warwick and Mr. M. W. Hazen, Bluebonnet Farm, McGregor, Texas, and Mr. L. A. Maddox, Jr., and Dr. H. R. Crookshank of the PanTech Farms, Texas Agricultural Experiment Station, for their assistance and cooperation in sampling cattle in feeding trials at their respective stations, to Priscilla Gougler for technical assistance, and to Carl Menger, a student of Texas A. and M. College, for assistance in the care and management of the experimental animals.

³ Departments of Biochemistry and Nutrition and Animal Husbandry, College Station, Texas.