Comparison of Thyroxine Secretion Rate of Docile and Flighty Lines of Fowls.

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Abstract
Two strains of chickens characterized by docile and flighty temperment were studied for estimated T4 secretion rate (TSR) during the summer (June). The flighty strain had a mean TSR of 0.82 [mu]g L-T4/100 g body weight (bw)/day, whereas the docile strain had a mean TSR of 0.58 [mu]g L-T4/ 100 g bw/day, a difference of 67.6%. In a 2nd trail with the temperature 90[degree] F, the TSR of the flighty birds was reduced to 0.58 [mu]g/100 g bw, but the docile birds were unaffected. The percentage uptake of I131 by the docile birds was about 40% greater than the flighty birds indicating that this is not a good index of the functional activity of the thyroid gland. Previous studies indicated that L-T3 and L-T4 were approximately equal in biological activity in fowls; here, however, the 2 lines of birds showed L-T3 to be slightly more than twice as active as L-T4.

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