Cholesteryl esterase activity has been demonstrated in the corpus luteum of the rat and the cow. The hydrolytic activity in bovine corpora lutea shows two pH optima, and is distributed throughout the particulate and supernatant fractions of the tissue. The greatest activity is present in the 5000 g pellet. The size of the available endogenous cholesteryl ester pools is also estimated. Some prop...

The harbour porpoise is the only cetacean species native to German waters. Since human pressures are suggested to shorten their reproductive lifespan, basic knowledge on reproduction is strongly required. One parameter is the onset of sexual maturity in female harbour porpoises. Therefore, we investigated the first signs of sexual maturity for a period of almost two decades (1990-2016). Ovaries...

Serial injections (i.m.) of 10 mg follicle stimulating hormone (FSFI-P) to cheetahs for 5 days followed by human chorionic gonadotropin (hCG, 500 IU) administered on both Days 6 and 7 resulted in ovarian follicle development and/or ovulation in six of seven attempts. One additional female given the same gonadotropin regimen when distinct corpora lutea (CL) were visible on the ovaries failed to ...

of the fact that in this species the embryos spend eight days in the Fallopian tube and uterus before they become attached. During this time Fraenkel interfered with the natural course of events by such experimental procedures as removal of both ovaries or excision by knife or cautery of all the corpora lutea. When such operations were done before the embryos were attached, subsequent autopsy t...

a suitable test for potency. Corner's and Allen's' studies on progestational proliferation in the rabbit, resulting from the physiological action of their extract of the corpus luteum, and Hisaw's and Leonard's2 similar results, provided a useful test, but one which had several practical objections, arising primarily from the relatively large size of the test animal, and the consequent expense ...

background: in recent years concerns have been raised about human reproductive disorders, specially the effects of environmental factors on human fertility and pregnancy outcome. therefore, the present study was designed to assess the effects of maternal caffeine consumption on ovarian follicles development in rat offspring. methods: 60 pregnant female rats were randomly divided into a control ...

The critical role of high level of serum LH in polycystic ovary syndrome was evaluated in rats by the long-term administration of hCG. Wistar-Imamichi strain mature female rats (age; 12 weeks) which showed at least two consecutive estrous cycles in vaginal smears were daily injected 10 IU hCG subcutaneously from diestrus for 80 days. Control rats were received saline solutions. On the next day ...

Accurate analysis of female reproductive toxicity requires a thorough understanding the differences in and specifics of estrous or menstrual cycles between laboratory animals. There are some species differences such as the time of sex maturation, the length of the estrous or menstrual cycle, the length of the luteal phase, the number of dominant follicles or corpora lutea, the size of follicles...

on the 1st day of oestrus into one or both uterine horns of cyclic gilts; sham-operated gilts served as controls. Immediate post-operative oestrous cycles averaged 20\m=.\0days for twenty-seven gilts with IUDs and 19\m=.\8days for fourteen controls. Eleven gilts with IUDs were mated at nineteen later oestrous periods; all returned to oestrus after mating, with cycles averaging 21\m=.\2days. Gil...

The roles of the androgen receptor (AR) in female fertility and ovarian function remain largely unknown. Here we report on the generation of female mice lacking AR (AR(-/-)) and the resulting influences on the reproductive system. Female AR(-/-) mice appear normal but show longer estrous cycles and reduced fertility. The ovaries from sexually mature AR(-/-) females exhibited a marked reduction ...