Abstract
WORK on the urinary conversion products of injected 14C-labeled estrone and estradiol-17β* (MacRae and Common, 1960; Ainsworth et al., 1962) suggested that estrone and estradiol-17β are quantitatively more important urinary estrogens in the hen and that there is less 16-epi-estriol than estrone or estradiol-17β and less estriol than 16-epi-estriol. However, direct quantitative chemical information about estrogen excretion by the hen is comparatively scanty. Common et al. (1965) have reported chemically determined values for daily urinary estrone excretion by four hens. The values (uncorrected for methodological loss) for hens that were not laying were within the range 0.4 μg. to 2.0 μg. per day. The values for two hens during periods of sustained egg-laying were within the range 2.2 μg. to 5.0 μg. per day, and the highest individual values for daily estrone excretion by these two hens (4.7 μg. and 7.5 μg.) were observed 3 to 5 days before the …
Published Version
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