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Effects of Iodine Level on Performance and Thyroid Traits of Growing Pigs

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Url: http://jas.fass.org/cgi/content/abstract/41/3/813

Effects of Iodine Level on Performance and Thyroid Traits of Growing Pigs

1

G. L. Cromwell, D. T. H. Sihombing2 and V. W. Hays

University of Kentucky, Lexington 40506

Abstract

Four experiments involving 163 pigs were conducted to determinethe effects of iodine level in a corn-soybean meal diet on bodyweight gain, feed required per unit gain and thyroid status.Pigs fed the basal diet (.055 ppm iodine) with no supplementaliodine had lower plasma protein-bound-iodine levels, hypertrophiedthyroids and trapped a greater amount of a 5 µc dose ofradioiodine (131I) as compared with those fed diets to whichiodine was added. Weight and uptake of 131I by thyroidal tissuedecreased quadratically (P<.01) with increasing level ofiodine in the diet; however, gain and feed/gain responses werenot significantly (P<.05) affected by iodine level. Leastsquares breakpoint estimates indicated that thyroid weightsand 131I uptake plateaued at levels of .031 and .077 ppm added iodine, respectively, suggesting that the iodine requirementof the growing pig is approximately .086 to. 132 ppm of thediet.

Footnotes

1

Department of Animal Sciences. Journal Paper No. 74-4-130 Universityof Kentucky, Agricultural Experiment Station.

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