Early work in ewes provided a wealth of information on the physiological regulation of
pulsatile gonadotropin-releasing hormone (GnRH) secretion by internal and external inputs …

Seasonal reproduction in ewes is caused by a dramatic increase in response to oestradiol
(E2) negative feedback during the nonbreeding (anoestrous) season. Considerable …

High levels of circulating prolactin are known to cause infertility, but the precise mechanisms
by which prolactin influences the neuroendocrine axis are yet to be determined. We used …

Con el propósito de discutir y analizar la información disponible, referente al
comportamiento reproductivo estacional de los ovinos en la República Mexicana, se realizó …

Although it has been recognized for over four decades that episodic GnRH secretion is a key
functional characteristic of the hypothalamo‐pituitary‐gonadal axis, the underlying neural …

Seasonal reproduction represents a naturally occurring example of functional plasticity in
the adult brain as it reflects changes in neuroendocrine pathways controlling gonadotropin …

829 REVISIÓN [REVIEW] ESTACIONALIDAD REPRODUCTIVA DE LA OVEJA EN MÉXICO [REPRODUCTIVE
SEASONALITY OF SHEEP IN MEXICO] J. Arroy Page 1 Tropical and Subtropical …

The objective of the present study was to evaluate the annual ovulatory activity of hair sheep
at 15° N. Nineteen Creole ewes with body weight of 40.8±0.3 kg were used. The ovulatory …

It is now clear that seasonal breeding in ewes is due to an increase in response to estradiol
(E2) negative feedback in the nonbreeding season (anestrus) that is mediated by the A15 …

Thimet oligopeptidase (TOP) and prolyl endopeptidase (PEP) are neuropeptidases involved
in the hydrolysis of gonadotropin-releasing hormone, a key component of the hypothalamic …