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special emphasis on studies in the ovine species . Archives of Physiology and Biochemistry 110 62 – 73 . ( doi:10.1076/apab.110.1.62.898 ) Clarke IJ Cummins JT 1984 Direct pituitary effects of estrogen and progesterone on gonadotropin

Introduction Estrogen is an important factor to regulate the postnatal sexual maturation in the rat. For half a century, it has been reported that the steroid hormone evokes functions of uterine tissue, the brain, and the pituitary during postnatal

and fertility are otherwise intact in these animals. The data suggest that progesterone-negative feedback at the level of the pituitary may be negligible, but that PR contributes to positive feedback effects of estrogens at this level of the HPG axis

testosterone concentrations during the luteal phase of the cycle but lower estradiol concentrations ( Dorgan et al. 2003 ). In the light of these previous studies, we have examined the serum concentrations of testosterone, estrogen, progesterone, and

link’ in the squamous epithelium. Hormone levels Levels of serum progesterone and estrogen were examined from the seven macaques described above using a commercial Coat-A-Count kit (Diagnostic Products Co., Los

Introduction Modulation of the immune system by progesterone in women has been suggested by a number of observations. First, the course and symptoms of autoimmune diseases change during pregnancy and different phases of the menstrual cycle. For

, Aguilar R & Blanco A 2004 Biological role of pituitary estrogen receptors ERα and ERβ on progesterone receptor expression and action and on gonadotropin and prolactin secretion in the rat. Neuroendocrinology 79 247 –258

Introduction Estrogens (17β-estradiol, estrone and progesterone) control diverse reproductive system functions. Their participation in other physiological processes such as cognition ( Sherwin 1999 ), cardiovascular function ( Stevenson 2000

cause of early embryonic loss and pregnancy failure in sheep and cattle ( Ayalon 1978 , Ashworth et al. 1989 , Shelton et al. 1990 , Thatcher et al. 1994 ). Thus, researchers have specifically proposed progesterone supplementation after breeding

-releasing hormone neurons: estrogenic control of galanin gene expression . Endocrinology 139 939 – 948 . doi:10.1210/en.139.3.939 . Skinner DC Harris TG Evans NP 2000 Duration and amplitude of the luteal phase progesterone increment times the