Puberty: For the gilt and filly, the first corpus luteum (CL) appears to have a normal lifespan. For both species, first CL usually is associated with estrus but can form in the absence of estrus. For the ewe and cow, a transient (1 to 4 d, ewe; 3 to 10 d, cow) rise and fall of ovarian derived progesterone (P4) is detected in peripheral blood (80% of ewes; 50% of heifers) prior to first "normal...

The ovary not containing the corpus luteum was removed from each of fifty-two ewes on Day 8 of the cycle. These animals were then allocated to one of the following groups. Group 1 : (control) received no further treatment. Group 2: the contralateral uterine horn, i.e. located on the side opposite to the corpus luteum, was removed. Group 3 : the ipsilateral uterine horn, i.e. located on the same...

Leptin is a multifunctional regulator in numerous tissues, including the pituitary. It is not known, whether the porcine pituitary is a source of leptin synthesis and possesses the leptin receptor protein. It is also unknown, if a relationship exists between expression levels of these proteins in the pituitary and physiological status of sows. Therefore, the aim of the study was 1] to examine, ...

Among the gonadotrophins, none has been studied more thoroughly than the active agent present in the blood and urine of pregnant women (Engle"5). Its chemical properties and the biological responses it is capable of inducing have been studied with great thoroughness, but as yet we are in total ignorance concerning the physiological significance of its presence in the pregnant primate. As recent...

Introduction One of the amazing features of the corpus luteum (CL) is the rapidity with which a very heterogeneous population of cells becomes organized into a functional unit. These diverse cells then communicate both directly and through paracrine mediators to facilitate the steroidogenic function and also the transient nature of the CL. Once the hormonal regulators of luteal function and dem...

background: adiponectin is one of the most important adipocytokines that regulate male and female fertility via adipor1 and adipor2 receptors. recently expression of adiponectin system and its negative regulatory role on hypothalamus-pituitary axis have been confirmed. objectives: no information is available about the expression pattern of adiponectin and its receptors in hypothalamus-pituitary...