Reference

Effects of corticosterone and dietary changes in the hen on ovarian function, plasma LH and steroids and the response to exogenous LH-RH

Effects of corticosterone and dietary changes in the hen on ovarian function, plasma LH and steroids and the response to exogenous LH-RH. Etches, R. J.; Williams, J. B.; Rzasa, J.In this study， 50-28-2 and 57-83-0 are also used. (Stn. Rech. Avicoles, INRA, Monnaie 37380, Fr.). J. Reprod. Fertil., 70(1), 121-30 (English) 1984. CODEN: JRPFA4. ISSN: 0022-4251. DOCUMENT TYPE: Journal CA Section: 12 (Nonmammalian Biochemistry) Section cross-reference(s): 18 Ovarian regression was induced in hens by infusing 30 mg cortiosterone/h, feeding diets deficient in Ca2+ or Na+, and by withdrawal of food and water. The wt. of the ovary was most severely reduced by the corticosterone infusion. The total no. of normal ovarian follicles weighing >0.012 g was not altered by any of the treatments. However, the no. of large yolk-filled follicles decreased, whereas the nos. of smaller follicles and atretic follicles increased when ovarian regression was induced by dietary changes or hormone infusion as compared to normally fed or solvent-infused hens. These exptl. treatments resulted in decreases in plasma concns. of LH, progesterone, and estradiol and increases in the plasma levels of corticosterone. These changes were immediate except on the low-Na+ diet, in which case there was a delay of ~6 days. When fasted birds were fed oats and given water, plasma LH and estradiol, but not progesterone, increased. The infusion of corticosterone did not affect the ability of the pituitary gland to secrete LH after an injection of LH-RH, but this response was reduced or eliminated by the other exptl. treatments. Apparently the regression of the ovary induced by these exptl. treatments is a consequence of the redn. in the secretion of LH, which may itself be caused by increased plasma levels of corticosterone. Recruitment of follicles in the maturational stage which precedes entry into the hierarchy of large yolky follicles was unaffected by all of the methods of inducing ovarian regression. .

Hormonal correlates of behavior development in male zebra finches

Hormonal correlates of behavior development in male zebra finches. Proeve, E. (Fak. Biol., Univ. Bielefeld, Bielefeld D-4800/1, Fed. Rep. Ger.). Horm. Behav. Higher Vertebr., [Proc. Conf.], Meeting Date 1982, 368-74.In this article, certain chemicals are used. Some of their cas registry numbers are 57-83-0 and 58-22-0 Edited by: Balthazart, Jacques; Proeve, Ekkehard; Gilles, R. Springer: Berlin, Fed. Rep. Ger. (English) 1983. CODEN: 50RDAP. DOCUMENT TYPE: Conference CA Section: 12 (Nonmammalian Biochemistry) Plasma levels of testosterone, dihydrotestosterone, progesterone, and estradiol were detd. by RIA every 4 days on days 10-75 posthatching in male zebra finches (Taeniopygia guttata castanotis). Increases in testosterone levels were obsd. on days 18-21, 34-37, and after day 74. There were no such defined peaks in the levels of dihydrotestosterone. Progesterone levels reached max. values on days 14-25 and before the onset of sexual maturity (days 70-73). Estradiol levels were low but increased beginning on day 39, reaching levels of 100-200 pg/mL by day 74. These hormonal changes are compared with the known behavioral and morphol. development of male finches. .