Abstract
THE principal estrogens of the domestic fowl are estrone, 17β-estradiol estriol and 16-epiestriol (Mulay et al., 1968) Previous data (Mathur et al., 1966) has emphasized the significant differences in the ratios of urinary estrogens in the laying hen. The principal estrogens of the domestic fowl, appearing in the urine in decreasing amounts, are estrone, 17β-estradiol, 16-espiestriol and estriol. It is not known, however, if there occurs any change in such ratios during the process of sexual maturation in the domestic fowl. In the prepubertal bull calf, for example, it has been shown (Linder, 1959; Linder and Mann, 1960) that androstenedion predominates while in adulthood, the reverse case exists with testosterone pre-dominating.Recently it has been shown by Subhas and Huston (1967) that environmental temperatures may alter the normal balance of gonadotrophic hormones in the maturing female fowl. The development of a sensitive and specific method of assay applicable to fowl…
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