The distribution of arbitrarily-classed large (~>4 mm dia.) and small (<4 mm dia.) follicles between the ovary with the lesser number of corpora lutea and the ovary with the greater number of corpora lutea was studied in pregnant cows, sows and ewes. At mid-pregnancy in the cow, numbers of large follicles reached a low level and remained at that level to the end of pregnancy on the ovary that c...

This study determined the effects of inhibiting vascular endothelial growth factor (VEGF) at follicle selection. Marmosets were given an injection of VEGF antagonist, the VEGF Trap on Day 5 of the follicular phase and ovaries were evaluated on Day 10 or 15. Ovaries from controls were assessed on Day 5 (time of selection), Day 10 (peri-ovulatory) and Day 15 (luteal phase). At Day 10, ovaries of ...

Eighty crossbred gilts were assigned randomly to treatments: 1) removal of an ovary and ipsilateral uterine horn (UHO) at 130 d of age and removal of the remaining ovary and uterine horn 12 d post-puberty; 2) UHO at 130 d of age, mated and reproductive tracts recovered when slaughtered at 30 d of gestation; 3) UHO 12 d post-puberty, mated and slaughtered at 30 d of gestation and 4) unoperated c...

The decline in pulsatile LH secretion and pituitary responsiveness to GnRH as pregnancy advances may be due to non-steroidal factors secreted by the ovine corpus luteum of pregnancy. Corpora lutea from ten ewes on days 70-80 of gestation were homogenized, charcoal-treated and, together with charcoal-treated follicular fluid from superovulated women, were subjected to inhibin immunoaffinity chro...

The total number of corpora lutea developed in the left and right overies of 170 white-toothed shrews (Crocidura russula monacha) differed significantly, showing a functional dominance of the left ovary. Blastocytes were equally distributed in both uterine horns.

I T has been demonstrated that exogenous progesterone exerts a stimulatory effect on ovulation in cattle (Hansel and Trimberger, 1952) as well as an inhibitory effect (Ulberg, Christian and Casida, 1951; Trimberger and Hansel, 1955; Nellor and Cole, 1957; Labhsetwar et al., 1964). However, the role of endogenous luteal progesterone in the regulation of bovine corpus luteum formation and functio...