The Iodine Requirements of Young Chickens ,

Effects of Environmental Temperature on the Iodine Requirements of Young Chickens

“…The 3 higher levels of iodine did not differ significantly from each other (P>.05). These results agree in general with those of Creek et al (1957) who noted a growth depression with 27-35 ppb and normal growth with 75 ppb of iodine.…”

“…This difference between the 2 environments was significant (P<.01) with the 2 lower levels of iodine, but there was no significant difference between environments at the 2 higher levels. In addition, the iodine requirement for normal thyroid size was in excess of 75 ppb, but not more than 150 ppb, at 21 C, whereas 75 ppb appeared adequate for normal thyroid size at 32 C. The results at 21 C agree with previous work (Creek et al, 1957) where thyroid enlargement was observed with 75 ppb iodine, but not with 150 ppb.…”

“…The iodine requirement for young chickens under normal rearing conditions has been demonstrated to be approximately 75 ppb for maximal growth (Creek et al, 1957). However, at least 150 and 300 ppb were needed for normal thyroid size and histology, respectively.…”

Relationship of pheasant populations and soils in central Iowa

“…The problem of iodine deficiency is usually confined to areas in which the soil contains inadequate amounts of this element, such as in the Great Lakes region or the Northwest, but goiter has been found in poultry from many regions of the United States. Creek et al (1954) reported that 0.05 p.p.m. of iodine failed to support normal growth.…”