Abstract
IT WAS reported by Premachandra et al. (1958) that marked differences in thyroxine secretion rate existed between two lines of New Hampshire chickens whose thyroids exhibited a differential response in undergoing compensatory hypertrophy to a constant oral level of thiouracil. Since several studies have revealed an apparent relationship between thyroxine secretion rate and growth (Schultze and Turner, 1945; Glazener and Shaffner, 1948; Glazener et al., 1949; Hoffman, 1950) it was deemed interesting to make a systematic study of growth in these high and low lines where such a great disparity in average thyroxine secretion rate was noted. After determining thyroxine secretion rate in individual birds of the two lines, matings were made between males of varying thyroxine secretion rate with similar females to determine the effect of these matings on the growth of the progeny. The “high” and the “low” lines mentioned above were also perpetuated to study their growth.
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