El objetivo del presente estudio fue evaluar la respuesta reproductiva de cabras ciclicas norte Mexico (26oN) sometidas a dos protocolos administracion prostaglandinas (PG; 5 dias vs 10 dias) con el fin sincronizar estral. Se formaron 2 grupos hembras caprinas adultas raza Alpino frances. Al Grupo G5 (n=10), se les administro primera inyeccion PG (0.2 ml; 160 μg cloprostenol) d -5 y grupo G10 (...

Darturition is believed to be initiated when adrenocorticotropic hormone (ACTH) from the fetal pituitary gland causes a release of cortisol from the fetal adrenal cortex (1). The fetal cortisol reduces placental progesterone production and increases placental estrogen production, resulting in release of prostaglandin F2, (PGF) from the uterus (1). Consequently, uterine activity increases, the c...

Prostaglandins have stimulative influence on the human uterus and therefore were introduced to medical treatment in reproductive healthcare as labor inductors or abortifacients. The UHPLC-ESI-QqQ-MS/MS method was developed for six prostaglandins: carboprost, cloprostenol, dinoprost (PGF2α), dinoprostone (PGE2), misoprostol sulprostone (substances pregnancy termination) pharmaceutical samples ap...

Recently, weak estrous behavior was assumed to be the cause of a decline in breeding efficiency in cattle. The present study investigated the effect of measuring the vaginal temperature on the detection of estrus in Japanese Black cows. First, the effect of hormone administration to cows with a functional corpus luteum on the vaginal temperature was evaluated by continuous measurement using a t...

The aim of this study was to determine whether endogenous progesterone regulates synthesis and secretion of luteal oxytocin. In Expt 1, mature ewes (n = 5 per group) were assigned randomly to control or mifepristone (RU486) treatment groups. Ewes were injected s.c. twice a day with vehicle or 10 mg RU486 on days 5-7 of the oestrous cycle (oestrus = day 0). On day 8, after an i.v. injection with...