scholarly journals Serum concentrations of oestradiol and progesterone, and sexual behaviour during the normal oestrous cycle in the leopard (Panthera pardus)

Reproduction ◽  
1988 ◽  
Vol 82 (1) ◽  
pp. 43-49 ◽  
Author(s):  
A. M. Schmidt ◽  
D. L. Hess ◽  
M. J. Schmidt ◽  
R. C. Smith ◽  
C. R. Lewis
Keyword(s):  
Sexual Behaviour ◽  
Oestrous Cycle ◽  
Panthera Pardus ◽  
Serum Concentrations

Ovarian activity in Arabian leopards (Panthera pardus nimr): sexual behaviour and faecal steroid monitoring during the follicular cycle, mating and pregnancy

2007 ◽  
Vol 19 (7) ◽  
pp. 822 ◽  
Author(s):  
Florine J. de Haas van Dorsser ◽  
Daphne I. Green ◽  
William V. Holt ◽  
Amanda R. Pickard
Keyword(s):  
Sexual Behaviour ◽  
Arabian Peninsula ◽  
Average Duration ◽  
Ovarian Activity ◽  
Panthera Pardus ◽  
Fundamental Understanding ◽  
In Captivity ◽  
Steroid Profiles ◽  
Basic Features ◽  
Steroid Excretion

The Arabian leopard is a critically endangered subspecies endemic to the Arabian Peninsula. A fundamental understanding of the ovarian activity of the leopard is important to enhance the success with which it breeds in captivity. The objective of the present study was to characterise the endocrinology of the follicular cycle, ovulation and pregnancy in captive females using faecal steroid hormone analyses and observations of sexual behaviour. The follicular cycle of the leopard was shown to last 18–23 days based on the interval between consecutive peaks of faecal oestrogen conjugates, and the occurrence of silent heats was high. Puberty had commenced at 2 years of age, but faecal steroid profiles did not match those of the adult female until 3 years of age. No seasonal change in ovarian steroid excretion was observed, although behavioural oestrus was suppressed in summer. Significant rises in faecal progestagen concentrations were only recorded in mated leopards, indicating that these females were strictly induced ovulators. However, only 60% of these mating periods were ovulatory. Progestagen concentrations during pregnancy were significantly higher than those of the non-pregnant luteal phase. The average duration of the non-pregnant and pregnant luteal phases was 39 and 97 days, respectively. The basic features of the reproductive cycle of the Arabian leopard described here form an important foundation for further study into its reproduction.

INDUCTION OF SEXUAL RECEPTIVITY BY OESTRADIOL BENZOATE IN CYCLIC FEMALE RATS: INFLUENCE OF OVARIAN SECRETIONS BEFORE INJECTION OF OESTRADIOL BENZOATE

1979 ◽  
Vol 80 (3) ◽  
pp. 389-395 ◽  
Author(s):  
P. SÖDERSTEN ◽  
S. HANSEN
Keyword(s):  
Sexual Behaviour ◽  
Oestrous Cycle ◽  
Female Rats ◽  
Ovariectomized Rats ◽  
Sexual Receptivity ◽  
Behavioural Effect ◽  
Progesterone Treatment ◽  
Oestradiol Benzoate

The ability of cyclic female rats to show sexual receptivity 24 h after an injection of 2 μg oestradiol benzoate (OB) was lost 24 h after ovariectomy. Exposure of cyclic rats to anti-oestrogen (nitromophene monocitrate) implants 24 h before ovariectomy and OB treatment prevented the latter from inducing sexual receptivity within 24 h of administration. Treatment of ovariectomized rats with constant release implants filled with an oil solution of 15 μg oestradiol/ml had no behavioural effect in itself, but prepared the rats to show lordosis 24 h after administration of OB. Progesterone treatment (4 mg) induced sexual behaviour in cyclic rats on days other than that of the oestrous cycle when the rats are normally receptive. Evidence is presented that a lower level of oestradiol stimulation than that present during pro-oestrus was needed for the induction of sexual receptivity in ovariectomized rats. It is suggested that the low basal level of oestradiol which was present throughout the oestrous cycle was necessary for the induction of sexual receptivity and that an increase in oestradiol stimulation served to increase the behavioural sensitivity to progesterone.

Steroid concentrations in rat corpora lutea isolated during the oestrous cycle and pseudopregnancy: effect of induction of ovulation at dioestrus

1989 ◽  
Vol 120 (2) ◽  
pp. 325-330 ◽  
Author(s):  
J. Th. J. Uilenbroek ◽  
P. J. A. Woutersen ◽  
P. D. M. van der Vaart
Keyword(s):  
Pituitary Gland ◽  
Corpus Luteum ◽  
Chorionic Gonadotrophin ◽  
Human Chorionic Gonadotrophin ◽  
Oestrous Cycle ◽  
Corpora Lutea ◽  
Serum Concentrations ◽  
Kidney Capsule ◽  
Cervical Stimulation ◽  
Sensitive Method

ABSTRACT Corpora lutea could be identified under the dissection microscope up to 7 days after formation. They were isolated during the oestrous cycle and pseudopregnancy and the progesterone and 20α-OH-progesterone contents were compared with serum values of these steroids. The pattern of progesterone in serum resembled that found in the corpora lutea. However, the pattern of 20α-OH-progesterone concentrations in serum and corpora lutea were different. While 20α-OH-progesterone concentrations in the corpora lutea showed large variations during the cycle, changes in serum concentrations of 20α-OH-progesterone were relatively small. Measurement of hormone concentrations in isolated corpora lutea is therefore a sensitive method for studying corpus luteum activity. To study whether corpora lutea derived after ovulation of immature follicles showed deficient luteal activity, rats at dioestrus (2 days before pro-oestrus) were induced to ovulate by the injection of 10 IU human chorionic gonadotrophin (hCG) and subsequent luteal activity was studied by measuring hormone concentrations in the corpora lutea on day 5 of pseudopregnancy. Concentrations of progesterone, but not of 20α-OH-progesterone, in corpora lutea derived from follicles induced to ovulate at dioestrusday 1 were significantly lower than those in corpora lutea derived from follicles induced to ovulate at prooestrus. This difference was observed not only when pseudopregnancy was induced by cervical stimulation but also when it was induced by implantation of a pituitary gland under the kidney capsule. However, in the latter case, corpora lutea already present on the day of hCG injection also became activated. The present experiments demonstrate that by measuring hormone concentrations in isolated corpora lutea changes in luteal activity can be studied effectively. Moreover, it appears that corpora lutea derived from immature follicles contained less progesterone than those derived from fully mature follicles. Journal of Endocrinology (1989) 120, 325–330

Observations on oetrus and the oestrous cycle in the marsupials Isoodon Macrourus and Perameles nasuta

1976 ◽  
Vol 24 (4) ◽  
pp. 513 ◽  
Author(s):  
AG Lyne
Keyword(s):  
Epithelial Cells ◽  
Sexual Behaviour ◽  
Cycle Length ◽  
Average Length ◽  
Oestrous Cycle ◽  
Polymorphonuclear Leucocytes ◽  
Vaginal Smears

Observations have been made on oestrus and the oestrous cycle in the bandicoots I. macrourus and P. nasuta caged indoors. Oestrus was diagnosed from a number of criteria, particularly the sexual behaviour of the males. Attempted matings, non-fertile matings and matings leading to pregnancy were restricted to one day of the oestrous cycle, except on one occasion when a male I. macrourus attempted to mate on two consecutive days. The lips of the urogenital opening of the female were usually greatly swollen at oestrus but pouch changes at this time were not detected. Vaginal smears at oestrus usually showed an increase in the number of partly and fully cornified epithelial cells and few, if any, polymorphonuclear leucocytes. During the winter and spring of 1972 and spring of 1973, over 1000 vaginal smears were taken from 29 P. nasuta and about 700 smears were taken from 21 I. macrourus. Information on the length of the oestrous cycle in P. nasuta, using all criteria, was obtained from only nine cycles in eight animals. The cycle length averaged 21 days but the range was from 10 to 34 days. Considerably more information on the length of the cycle was obtained from the smaller number of I. macrourus; the average length of 39 cycles in 15 animals was 20 days, the range being 9-34 days.

scholarly journals Serum concentrations of oestradiol and progesterone during the normal oestrous cycle and early pregnancy in the lion (Panthera leo)

Reproduction ◽  
1979 ◽  
Vol 57 (2) ◽  
pp. 267-272 ◽  
Author(s):  
A. M. Schmidt ◽  
L. A. Nadal ◽  
M. J. Schmidt ◽  
N. B. Beamer
Keyword(s):  
Early Pregnancy ◽  
Oestrous Cycle ◽  
Panthera Leo ◽  
Serum Concentrations

Changes in serum concentrations of immunoreactive inhibin during the oestrous cycle of the rat

1989 ◽  
Vol 121 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Y. Hasegawa ◽  
K. Miyamoto ◽  
M. Igarashi
Keyword(s):  
Oestrous Cycle ◽  
Serum Concentrations ◽  
Close Relationship ◽  
Level 3

ABSTRACT Serum and ovarian concentrations of inhibin during the oestrous cycle of rats were determined by a radioimmunoassay (RIA) based on a porcine inhibin RIA. Serum concentrations of LH, FSH, oestradiol-17β, progesterone and testosterone were also determined during the cycle. Serum concentrations of inhibin were high (8·47 ± 0·58 μg/l) during the morning of pro-oestrus and then dropped sharply to the lowest level (3·21 ± 0·38 μg/l) at 24.00 h on the day of pro-oestrus after the preovulatory LH and FSH surge. Inhibin concentrations then recovered rapidly, with a peak (7·94 ± 0·97 μg/l) at 15.00 h on the day of oestrus. Inhibin concentrations in serum dropped again to their second lowest value (4·00 ± 0·12 μg/l) at 24.00 h on the day of oestrus. The largest FSH surge observed from midnight of pro-oestrus to the morning of oestrus (the so-called second FSH surge) was shown to be inversely related to the changes in serum concentrations of inhibin, suggesting a close relationship between the serum FSH and inhibin concentrations in cyclic rats. Journal of Endocrinology (1989) 121, 91–100

scholarly journals Effect of hypothalamic deafferentation on LH and sexual behaviour in ovariectomized ewe under hormonally induced oestrous cycle

1978 ◽  
Vol 18 (6) ◽  
pp. 1413-1426 ◽  
Author(s):  
J. C. THIERY ◽  
J. PELLETIER ◽  
J. P. SIGNORET ◽  
Colette LAVENET ◽  
P. ORGEUR ◽  
...  
Keyword(s):  
Sexual Behaviour ◽  
Oestrous Cycle ◽  
Hypothalamic Deafferentation
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