Lipid changes were studied histochemically in the ovarian interstitial tissue of untreated and hormone-treated rats during the oestrous cycle, pseudopregnancy, pregnancy and lactation. The hormones tested were LH, prolactin and oestradiol benzoate, alone or in combination. Conspicuous lipid changes occurred only in response to LH.

Progesterone concentrations in peripheral plasma samples on Days 7 and 11 of oestrous cycles throughout the breeding season showed a negative relationship to the mean minimum environmental temperature for the Days 0-7 and 0-11 respectively of that cycle during which the samples were collected.

To elucidate changing patterns of inhibin/activin subunit mRNAs in the ovary of the golden hamster (Mesocricetus auratus) during the oestrous cycle, inhibin/activin subunit cDNAs of this species were cloned and ribonuclease protection assay and in situ hybridization were carried out. Inhibin alpha-subunit mRNA was localized in granulosa cells of primary, secondary, tertiary and atretic follicle...

Changes in pulsatile secretion of LH, FSH, oestradiol and progesterone were related to the growth phase, early plateau phase and regression phase of the first ovarian dominant follicle of the oestrous cycle in Bos indicus heifers. Relationships between these hormones during the three phases were also investigated. Accurate measurements of episodic ovarian steroid secretion were obtained by cath...

The importance of canine reproduction is steadily increasing and little is known about the canine cervix and ovary so far. The aim of this study is to describe the histomorphology of the canine cervix, ovary and to determine its correlation with the stage of oestrous cycle and to circulating concentrations of progesterone (P4) and estradiol17beta (E2) and vaginal cytology respectively. Twenty h...

Oestrous cycles were followed by blood progesterone titration and the occurrence of pregnancy was observed after mating in three groups of mature female Nubian goats. Two groups of 4 and 3 goats each were experimentally infected by an in utero injection of either a Staphylococcus aureus or a Mycoplasma capricolum strain of caprine origin. A third group of 4 goats served as a control. Both bacte...

If preconditioned by a period of isolation from rams during the non-breeding season, ewes of many breeds respond to the reintroduction of rams (teasing) by displaying a relatively synchronised oestrus, approximately one oestrous cycle later (Merino: Schinckel 1954a; Awassi: Eyal 1958; Romney: Edgar and Bilkey 1963; Merinos d'Arles: Prud'hon et al. 1966). The oestrous activity of the flock is sp...