scholarly journals Relation between circulating sex steroid concentrations and sexual behaviour during pregnancy and post partum in the domestic rabbit

Reproduction ◽  
1988 ◽  
Vol 82 (1) ◽  
pp. 209-218 ◽  
Author(s):  
I. Stoufflet ◽  
M. Caillol
Keyword(s):  
Sexual Behaviour ◽  
Post Partum ◽  
Sex Steroid ◽  
Domestic Rabbit

HEMMUNG VON TESTOSTERONABHÄNGIGEN DIFFERENZIERUNGSVORGÄNGEN DER MÄNNLICHEN RATTE NACH DER GEBURT

1967 ◽  
Vol 54 (2) ◽  
pp. 227-240 ◽  
Author(s):  
F. Neumann ◽  
J. D. Hahn ◽  
M. Kramer
Keyword(s):  
Sexual Behaviour ◽  
Cyproterone Acetate ◽  
Post Partum ◽  
Sexual Attitude ◽  
Normal Male ◽  
Corpora Lutea ◽  
List Type ◽  
Newborn Rats ◽  
Neonatal Treatment ◽  
Triangular Shape

ABSTRACT Male newborn rats were injected with 2 mg of an antiandrogen (1,2α-methylene-6-chloro-pregna-4,6-dien-17α-ol-3,20-dione-17α-acetate = cyproterone acetate) daily from their 1st to their 14th day of life. The following effects of this treatment were observed in these animals after onset of sexual maturity: 84% of the animals are unable to reproduce. Penis: the frenulum is broadened to a lamina of triangular shape, which almost completely prevents the preputium from being pushed back. These males show a rather insufficient male sexual behaviour towards females in oestrus. After castration and ovar implantation, some of the treated animals show true corpora lutea and at attempts of cohabitation partially female sexual behaviour towards normal male animals. From these results it can be concluded, that differentiation of the penis is not completed at the time of birth. The infertility of the animals may be caused by the penile changes (difficulties with intromission) as well as by the aimless sexual behaviour. This aimless sexual behaviour, the ability to produce true corpora lutea and finally their partially female sexual attitude under the influence of the hormones from the implanted ovaries led to the conclusion, that the above described neonatal treatment apparently inhibited testosterone-depending post partum developments of sexual differentiation in hypothalamic centers.

Sexual behaviour in the domestic rabbit

1990 ◽  
Vol 2 (3) ◽  
pp. 293-293
Author(s):  
M.E. Albonetti ◽  
F. Dessì-Fulgheri ◽  
F. Farabollini
Keyword(s):  
Sexual Behaviour ◽  
Domestic Rabbit

scholarly journals Regulation of sexual behaviour in male macaques by sex steroid modulation of the serotonergic system

2006 ◽  
Vol 91 (2) ◽  
pp. 445-456 ◽  
Author(s):  
Gordon M. Barrett ◽  
Massimo Bardi ◽  
Ana Karina Zavala Guillén ◽  
Akio Mori ◽  
Keiko Shimizu
Keyword(s):  
Sexual Behaviour ◽  
Serotonergic System ◽  
Sex Steroid ◽  
Steroid Modulation

The role of sex steroid receptors in sheep female reproductive physiology

2004 ◽  
Vol 16 (4) ◽  
pp. 385 ◽  
Author(s):  
A. Meikle ◽  
C. Tasende ◽  
C. Sosa ◽  
E. G. Garófalo
Keyword(s):  
Steroid Receptors ◽  
Post Partum ◽  
Progesterone Receptors ◽  
Reproductive Physiology ◽  
Receptor Expression ◽  
Present Review ◽  
Sex Steroid ◽  
Receptor Subtypes ◽  
Luteal Function

Cell responsiveness to steroid hormones is related to the number and affinity of its receptors, thus factors affecting steroid expression will influence tissue sensitivity and functionality. The present review discusses the role of oestrogen and progesterone receptors in sheep female reproductive physiology. The mechanism of steroid hormone action in the target cell is introduced first; the tissue distribution, physiological functions and regulation of oestrogen receptor subtypes and progesterone receptor isoforms in ruminants are reported. The role of steroid receptors in target tissues (with emphasis on the uterus and pituitary gland) during different physiological events is addressed in an attempt to clarify oestrogen and progesterone actions in different developmental and reproductive stages: prepubertal period, oestrous cycle, pregnancy, post-partum period and seasonal anoestrus. The present review shows how the distinct reproductive stages are accompanied by dramatic changes in uterine receptor expression. The role of oestrogen and progesterone receptors in the molecular mechanism responsible for premature luteolysis that results in subnormal luteal function is discussed. Finally, the effect of nutrition on sex steroid receptor expression and the involvement on reproductive performance is reported.

Female sex steroid induced gallbladder epithelium changes and gallstone deposits in female hamsters: TEM and SEM aspects

1993 ◽  
Vol 51 ◽  
pp. 354-355
Author(s):  
S. Karkare ◽  
J. Gilloteaux ◽  
T. R. Kelly
Keyword(s):  
Hormone Receptors ◽  
Corn Oil ◽  
Estrogen Therapy ◽  
Gallstone Formation ◽  
The United States ◽  
Sex Steroid ◽  
Estradiol Valerate ◽  
Surface Epithelium ◽  
Female Sex ◽  
Purina Chow

Approximately 1 million people in the United States alone develop gallstones each year. The incidence is higher in women than in men and the ratio being 4 ≥ 1. A correlation has also been suggested between oral contraceptives and cholelithiasis. In addition, postmenopausal or cancer estrogen therapy has been reported to be a factor responsible for gallstone formation. Female sex hormone receptors have been detected not only in the gallbladder musculature, but also in its epithelium. As a follow up to experiments effectuated in the male and the ovariectomized Syrian hamster, this report shows that, a combination of a low cholesterol diet with female sex steroid treatment contributes to the formation of gallstone-like deposits, while modifying the surface epithelium morphology. Syrian hamsters (F1B strain, BioBreeders, Watertown MA) were housed under 12h light: 12 h dark cycle, at 20 °C, fed Purina chow and water ad libitum. Several duration/treatment groups were studied, but this report will focus on data obtained with the group injected weekly with estradiol valerate (E weekly, s.c. 8-10 μg/100 g.b.w., in corn oil) and with i.m. medroxyprogesterone acetate (DepoProvera Upjohn Co., Kalamazoo, MI; 8-10 mg/100 g.b.w.) for a 3-month period. Other parameters (blood and bile) were also studied but not reported here.

Serum Vitamin B12 Concentrations among Mothers and Newborns and Follow-up Study to Assess Implication on the Growth Velocity and the Urinary Methylmalonic Acid Excretion

2009 ◽  
Vol 79 (56) ◽  
pp. 297-307 ◽  
Author(s):  
Laila Hussein ◽  
Sahar Abdel Aziz ◽  
Salwa Tapouzada ◽  
Boehles
Keyword(s):  
Early Diagnosis ◽  
Growth Velocity ◽  
Methylmalonic Acid ◽  
Post Partum ◽  
Serum Vitamin ◽  
Vitamin B ◽  
Postnatal Life ◽  
Negative Consequences ◽  
Metabolic Marker ◽  
Biochemical Measurement

Objective:Cobalamin (B12) deficiency has been reported in infants born to mothers with low cobalamin intake. Early diagnosis of vitamin B12 deficiency in infants is critical for the prevention of neurobehavioral disorders. We investigated the relationship between serum vitamin B12 level in newborns and in their healthy mothers who consumed an omnivorous diet. Anthropometry was studied longitudinally to assess the growth velocity of the infants. Urinary methylmalonic acid (MMA) excretion of 6-month old infants was compared retrospectively as the biomarker correlated with the initial serum vitamin B12 concentrations. Methods: Serum cobalamin and blood hemoglobin were determined in 84 pairs of newborns and their mothers. Urinary MMA excretion was measured in the same subjects during the first 6 months of the post partum period. Results: At birth, median serum cobalamin levels were 152.0 pmol/L in the mothers and 296.6 pmol/L in the newborns. Maternal and neonatal serum cobalamin levels had no effect on growth velocity during the first six months of postnatal life. Serum maternal and neonatal cobalamin levels were inversely associated with urinary MMA excretion. Conclusion: Early diagnosis of vitamin B12 status in neonates and infants is crucial, particularly in nutritionally deprived areas. Biochemical measurement of plasma cobalamin or its metabolic marker MMA is highly recommended. Urinary MMA measurement in cobalamin diagnostics provides an advantage in that blood sampling is not required. A vitamin B12 taskforce should be created to alleviate vitamin deficiency and its negative consequences.

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