BLOOD HORMONE CHANGES ASSOCIATED WITH PUBERTY IN THE FEMALE PIG

1984 ◽  
Vol 64 (1) ◽  
pp. 177-181
Author(s):  
K.-H. PONZILIUS ◽  
L. M. SANFORD ◽  
G. D. PHILLIPS ◽  
W. M. PALMER
Keyword(s):  
Key Words ◽  
Estrous Cycle ◽  
Reproductive Hormones ◽  
Serum Concentrations ◽  
Lh Surge ◽  
Key Words Blood

Serum concentrations of reproductive hormones were determined in gilts around puberty. LH levels were low prior to pubertal estrus. FSH concentrations were high on day −5, decreased by day −1, then peaked simultaneously with the presumed preovulatory LH surge; a further increase was observed on day 3 of the first estrous cycle. Progesterone levels were consistently low prior to pubertal estrus and rose dramatically following ovulation. Peak levels of estrogen occurred between day −1 and day +1 of pubertal estrus. Key words: Blood hormone changes, puberty, female pig

INFUSION OF ESTRADIOL DURING THE LUTEAL PHASE OF THE ESTROUS CYCLE IN THE EWE COMPLETELY ELIMINATES LH PULSES

1990 ◽  
Vol 70 (4) ◽  
pp. 1147-1150 ◽  
Author(s):  
I. B. J. K. JOSEPH ◽  
N. C. RAWLINGS
Keyword(s):  
Key Words ◽  
Estrous Cycle ◽  
Luteal Phase ◽  
Serum Estradiol ◽  
Lh Surge ◽  
Lh Secretion

Elevation of serum estradiol (E2) levels to ≈ 23 pg mL−1 on day 12 of the estrous cycle of the ewe eliminated LH pulses, but did not induce luteolysis and a preovulatory surge release of gonadotropins. The E2 treatment appeared to exert a functional luteotropic effect. The results indicate a strong synergism between E2 and progesterone (P4) in the control of tonic LH secretion during the luteal phase and that P4 blocks the preovulatory LH surge mechanism at high, but physiological levels of E2. Key words: Estradiol, LH pulses, luteal phase, ewe, luteotropic

The effects of acclimation to confinement on gonadotrophin and cortisol secretion during the estrous cycle of the ewe

1991 ◽  
Vol 71 (2) ◽  
pp. 327-332 ◽  
Author(s):  
N. C. Rawlings ◽  
S. J. Cook
Keyword(s):  
Key Words ◽  
Estrous Cycle ◽  
Pulse Amplitude ◽  
Pulse Frequency ◽  
Cortisol Secretion ◽  
Serum Concentrations ◽  
Blood Samples ◽  
Progesterone Secretion ◽  
Serum Lh ◽  
Lh Secretion

The purpose of the study was to examine the effects of acclimation to confined housing on tonic gonadotrophin, cortisol and progesterone secretion in ewes at different stages of the estrous cycle. On days 4, 12 and 16 of the estrous cycle separate groups of eight ewes were blood sampled every 5 min for 6 h. Of the eight ewes bled at each stage of the cycle four were moved from outside drylots to small pens in a building 2 d prior to blood sampling and four were moved 4 d prior to sampling. All blood samples were analyzed for concentrations of LH and FSH and one sample for each hour of intensive bleeding, for each ewe, was analyzed for cortisol and progesterone. All hormone concentrations were obtained by radioimmunoassay. On day 4 of the estrous cycle LH pulse frequency and mean serum concentrations of LH were higher, but mean FSH concentrations were lower, in ewes confined for 4 d, compared to those confined for 2 d (P < 0.05). On day 12 of the cycle, mean serum LH concentrations only were higher in ewes confined for 4 d (P < 0.05). At day 16 no differences were seen between ewes confined for 2 or 4 d. Serum concentrations of progesterone, cortisol and LH pulse amplitude did not vary significantly between ewes confined for 2 or 4 d. However, in ewes confined for 4 d, serum concentrations of cortisol fell from day 4 to day 16 of the estrous cycle (P < 0.05). We conclude that acclimation to confined housing in the intact cyclic ewe is reflected in changes in tonic LH secretion at stages of the estrous cycle when serum concentrations of cortisol are high. Key words: LH, FSH, cortisol, confinement, cyclic ewe

scholarly journals The fertility assessment of normal cyclic Wistar rats following the administration of methanolic extract of Portulaca oleracea: an experimental study

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Izuchukwu Azuka Okafor ◽  
Uchenna Somtochukwu Nnamah ◽  
Jude Nnaka
Keyword(s):  
Estrous Cycle ◽  
Adult Female ◽  
Wistar Rats ◽  
Major Effect ◽  
Reproductive Hormones ◽  
Portulaca Oleracea ◽  
High Dose ◽  
Methanolic Extracts ◽  
Cycle Arrest ◽  
Female Wistar Rats

Abstract Background Purslane is a widely distributed shrub used for the treatment of different ailments. The increasing reproductive complications associated with herbal treatments have led to the need to critically evaluate the safety and/or reproductive potentials of commonly used plant extracts. This study investigated the reproductive effect of methanolic extracts of Portulaca oleracea (MEPO) in adult female Wistar rats. Results Group C showed a significant decrease both in relative ovarian weight (p = 0.000), and relative uterine weight (p = 0.037), when compared with the control. There were no significant (p ˃ 0.05) changes in the levels of follicle-stimulating hormone, luteinizing hormone, progesterone, and estradiol. When compared to the control, groups B and C showed abnormal estrous cycle and cycle arrest especially at the metestrus phase with mild congestion of a few blood vessels in the ovary and uterus. Conclusions MEPO may possess some anti-fertility effect, as it disrupts the estrous cycle of adult female Wistar rats; although it has no major effect on the reproductive hormones, uterus, and ovarian histology of adult female Wistar rats. However, high dose consumption should be taken with precaution.

Sexual behavior and serum concentrations of reproductive hormones in normal stallions

1985 ◽  
Vol 23 (4) ◽  
pp. 607-617 ◽  
Author(s):  
C.H.G. Irvine ◽  
S.L. Alexander ◽  
J.P. Hughes
Keyword(s):  
Sexual Behavior ◽  
Reproductive Hormones ◽  
Serum Concentrations

Serum concentrations of fully and undercarboxylated osteocalcin do not vary between estrous cycle stages in Sprague–Dawley rats

Endocrine ◽  
2013 ◽  
Vol 44 (3) ◽  
pp. 809-811 ◽  
Author(s):  
Brielle V. Rosa ◽  
Hugh T. Blair ◽  
Mark H. Vickers ◽  
Cameron G. Knight ◽  
Patrick C. H. Morel ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Undercarboxylated Osteocalcin ◽  
Serum Concentrations ◽  
Sprague Dawley ◽  
Sprague Dawley Rats

scholarly journals The effect of dietary protein on reproduction in the mare. IV. Serum progestagen, FSH, LH and melatonin concentrations during the anovulatory, transitional and ovulatory periods in the non-pregnant mare

1997 ◽  
Vol 68 (4) ◽  
Author(s):  
F.E. Van Niekerk ◽  
C.H. Van Niekerk
Keyword(s):  
Protein Quality ◽  
Reproductive Hormones ◽  
Transitional Period ◽  
Protein Diet ◽  
Serum Concentrations ◽  
High Quality ◽  
Total Protein Intake ◽  
High Quality Protein ◽  
Cyclical Pattern

The effect of total protein intake and protein quality on the serum concentrations of certain reproductive hormones during the anovulatory, transitional and ovulatory periods were studied in 36 Anglo-Arab mares. High-quality protein stimulated FSH and LH production during the late transitional period. Serum progestagen and melatonin concentrations were unaffected by the quality of protein nutrition during the anovulatory period. Mares receiving high-quality protein exhibited a 10-14-day cyclical pattern of FSH release approximately 4-6 weeks earlier than the mares fed the lower-quality protein diet, and also ovulated 3-4 weeks earlier than the mares on the lower-quality protein diet. Progesterone concentrations during the 1st oestrous cycle after the anovulatory period were unaffected by protein quality in the diet.

Changes in Ovarian and Uterine Morphology and Estrous Cycle in CD-1 Mice After Vanadium Inhalation

2019 ◽  
Vol 39 (1) ◽  
pp. 20-29
Author(s):  
Nayeli Meléndez-García ◽  
Fátima García-Ibarra ◽  
Patricia Bizarro-Nevares ◽  
Marcela Rojas-Lemus ◽  
Nelly López-Valdez ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Estrogen Receptor Α ◽  
Reproductive Organs ◽  
Control Group ◽  
Serum Concentrations ◽  
Pregnant Females ◽  
Female Sex Hormones ◽  
Preovulatory Follicles ◽  
17Β Estradiol ◽  
Female Reproductive Organs

Vanadium is a metal present in particulate matter and its reprotoxic effects have been demonstrated in males and pregnant females in animal models. However, the effects of this metal on the reproductive organs of nonpregnant females have not been sufficiently studied. In a vanadium inhalation model in nonpregnant female mice, we found anestrous and estrous cycle irregularity, as well as low serum concentrations of 17β-estradiol and progesterone. A decrease in the diameter of secondary and preovulatory follicles, as well as a thickening of the myometrium and endometrial stroma, was observed in the vanadium-treated mice. There was no difference against the control group with respect to the presence of the estrogen receptor α in the uterus of the animals during the estrous stage. Our results indicate that when vanadium is administered by inhalation, effects are observed on the female reproductive organs and the production of female sex hormones.

Comparison of bovine uterine horns for progesterone and oxytocin levels with bilateral corpus luteum

1996 ◽  
Vol 76 (3) ◽  
pp. 463-464 ◽  
Author(s):  
W. A. Cerbito ◽  
M. P. B. Wijayagunawardane ◽  
M. Takagi ◽  
K. Sato ◽  
A. Miyamoto ◽  
...  
Keyword(s):  
Key Words ◽  
Corpus Luteum ◽  
Estrous Cycle ◽  
Luteal Phase ◽  
Uterine Horn ◽  
Corpora Lutea ◽  
Uterine Tissue ◽  
Tissue Samples ◽  
Significant Difference ◽  
The Right

Bovine uterine horns with both ovaries containing a corpus luteum (CL) were compared for progesterone (P4) and oxytocin (OT) concentrations during the luteal phase of the estrous cycle. Uterine tissue samples from five Holstein cows with bilateral CL obtained from the slaughterhouse were used for this study. No significant difference was observed in P4 and OT levels in the right and left horns with corpora lutea in both ovaries. The data clearly indicate that both sides of the uterine horn having a functional CL are exposed to similar levels of P4 and OT, supporting the hypothesis that luteal products are delivered locally to the uterus. Key words: Progesterone, oxytocin, uterine horn, bilateral, corpus luteum, cow

345 EFFECT OF FOLLICLE STIMULATING HORMONE AND HUMAN CHORIONIC GONADOTROPHIN ON THE IN VITRO MATURATION OF CANINE OOCYTES

2007 ◽  
Vol 19 (1) ◽  
pp. 288
Author(s):  
M.-K. Kim ◽  
H.-J. Oh ◽  
Y. H. Fibrianto ◽  
G. Jang ◽  
H.-J. Kim ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Uv Light ◽  
Follicle Stimulating Hormone ◽  
Reproductive Hormones ◽  
Chorionic Gonadotrophin ◽  
Human Chorionic Gonadotrophin ◽  
Nuclear Maturation ◽  
Maturation Rate ◽  
Stimulating Hormone

Growth, maturation, and ovulation of the Graafian follicle depend on appropriate patterns of secretion, sufficient concentrations, and adequate ratios of various reproductive hormones, especially follicle stimulating hormone (FSH) and luteinizing hormone (LH) (Van Tol et al. 1996 Mol. Reprod. Dev. 45, 218–224). The present study investigated the effects of FSH and human chorionic gonadotrophin (hCG) on the nuclear maturation of canine oocytes. In addition, in order to investigate the effect of stage of the estrous cycle on the meiotic competence of canine oocytes matured in vitro, oocytes were collected from various reproductive states and matured in vitro in the presence of the gonadotrophins. Estrous cycle stage was evaluated for each bitch by ovarian morphology, and bitches were categorized according to the stage of the estrous cycle (anestrus, follicular, or diestrus) prior to oocyte collection. Recovered oocytes were cultured in serum-free tissue culture medium (TCM)-199 supplemented with various concentrations of FSH (Exp. 1: 0, 0.1, 1.0, or 10 IU) or hCG (Exp. 2: 0, 0.5, 1.0, or 10 IU) or both (Exp. 3: 1 IU FSH + 1 IU hCG) for 72 h to determine the effective concentration of these hormones, and to examine their combined effect. After maturation culture, oocytes were denuded in PBS containing 0.1% (w/v) hyaluronidase by gentle pipetting. The denuded oocytes were stained with Hoechst 33342 in glycerol and the nuclear state of oocytes was evaluated under UV light. The rates of maturation to the MII stage were significantly higher (P &lt; 0.05) when follicular-stage oocytes were supplemented with 1 IU FSH (6.2%) compared with the other FSH-supplemented groups (0.0 to 3.3%) or to the control (1.8%), or 0.1 or 10.0 IU FSH (0 to 1.2%). Significantly higher (P &lt; 0.05) maturation rate to MII stage was observed in follicular-stage oocytes supplemented with 1.0 IU hCG (7.2%) compared with the control or other hCG-supplemented groups (0 to 1.5%). However, FSH and hCG together did not improve the nuclear maturation rate of canine oocytes (2.4%) compared with FSH (6.2%) and hCG alone (7.2%). In conclusion, FSH or hCG alone significantly increased the maturation of canine oocytes to the MII stage. This work was supported by grant No. M1062503005-06N250300510 from KOSEF, Republic of Korea.

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