scholarly journals Determination of Annual Plasma Hormone Levels Associated with Reproduction in Long-Day Breeding Domestic Geese

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2363
Author(s):  
Małgorzata Gumułka ◽  
Nataly Avital-Cohen ◽  
Israel Rozenboim
Keyword(s):  
Quadratic Trend ◽  
Hormone Levels ◽  
Long Day ◽  
Plasma Hormone ◽  
Annual Period ◽  
Endocrine Axis

This paper examines the dynamics of circulating hormone changes connected with reproduction in geese during the annual period related to gonad morphometry. One hundred geese were examined. The levels of prolactin (PRL), triiodothyronine (T3), thyroxine (T4), testosterone (T), progesterone (P4) and estradiol (E2) were estimated. In both sexes, PRL level patterns fit a quadratic trend with elevations in the post-breeding and the second half of the breeding–laying periods. During these periods, differences in the PRL level between sexes were noted. In ganders, increased PRL levels during the laying period occurred earlier compared to in female geese. Cubic trends for T and E2 in ganders and quadratic for T, P4, and E2 in female geese were observed. PRL was negatively correlated with T in both sexes and with P4 and E2 in female geese. A higher level of T3 and variation in T4 in ganders with a quartic trend in ganders vs. a quadratic in female geese were noted. Patterns of PRL, T, and E2 suggested that the breeding–laying period in ganders may be shorter than in female geese. These findings will be used to explore experimental manipulations of the endocrine axis to increase synchronisation of both sexes.

scholarly journals Determination of the regulatory properties of Yucca schidigera extracts on the biochemical parameters and plasma hormone levels associated with obesity

2016 ◽  
Vol 26 (2) ◽  
pp. 246-250 ◽  
Author(s):  
Ismail Kucukkurt ◽  
Esra Küpeli Akkol ◽  
Funda Karabag ◽  
Sinan Ince ◽  
Ipek Süntar ◽  
...  
Keyword(s):  
Biochemical Parameters ◽  
Hormone Levels ◽  
Yucca Schidigera ◽  
Plasma Hormone ◽  
Regulatory Properties

LRF and TRF test during long-term danazol treatment: increase of the LH and FSH responses but decrease of the prolactin and TSH responses

1983 ◽  
Vol 104 (1) ◽  
pp. 1-5 ◽  
Author(s):  
J. Leppäluoto ◽  
L. Rönnberg ◽  
P. Ylöstalo
Keyword(s):  
Clinical Symptoms ◽  
Follicular Phase ◽  
Blood Samples ◽  
Hormone Levels ◽  
Coefficients Of Variation ◽  
The Mean ◽  
Thyroid Hormone Levels ◽  
Low Serum

Abstract. Seven patients suffering from severe endometriosis were treated with danazol 200 mg × 3 daily for 6 months. Clinical symptoms were alleviated and menses disappeared in response to the treatment. After cessation of the treatment the menstrual bleedings returned in 1–3 months. Blood samples for determination of gonadotrophins, prolactin (Prl), oestradiol (E2), progesterone, thyroid hormones and thyrotrophin in radioimmunoassays were taken and a combined TRF and LRF test carried out in the follicular phase before treatment, at the 6th month of treatment and after reappearance of the first menses. There were no statistically significant changes in the basal levels of serum FSH, LH or TSH during the danazol treatment. Neither was there any change in episodic secretions of FSH, LH or Prl, as determined by the mean coefficients of variation of the hormone levels in seven consecutive samples taken at 20 min intervals. On the other hand, serum E2, Prl and thyroid hormone levels were significantly decreased in the 6th month of treatment. In the TRF-LRF test the responses of serum FSH and LH were significantly higher and those of serum Prl and TSH significantly lower during danazol treatment than before. Prl responses remained lowered after the treatment. It appears that low serum oestrogen levels, induced by the danazol treatment, sensitize the pituitary gonadotrophs to exogenous LRF, but make the sensitivity of thyrotrophs and lactotrophs lower to exogenous TRF. These results thus indicate that danazol does not make the pituitary gonadotrophs insensitive to LRF, but danazol may rather inhibit the secretion of hypothalamic LRF.

Seminal Plasma Transferrin Concentration: Relationship with Seminal Parameters and Plasma Hormone Levels

1992 ◽  
Vol 49 (3) ◽  
pp. 158-162 ◽  
Author(s):  
H. Fuse ◽  
S. Satomi ◽  
M. Okumura ◽  
T. Katayama
Keyword(s):  
Seminal Plasma ◽  
Hormone Levels ◽  
Seminal Parameters ◽  
Plasma Hormone

24-Hour Mean Plasma Hormone Levels in Men with Coronary Heart Disease.

1981 ◽  
Author(s):  
Barnett Zumoff ◽  
David K. Fukushima ◽  
Robert S. Rosenfeld ◽  
Raymond G. Tropler ◽  
James Hickman
Keyword(s):  
Coronary Heart Disease ◽  
Heart Disease ◽  
Hormone Levels ◽  
Plasma Hormone

Lipolytic responsiveness to epinephrine in nondiabetic and diabetic humans

1997 ◽  
Vol 272 (6) ◽  
pp. E1130-E1135 ◽  
Author(s):  
G. D. Divertie ◽  
M. D. Jensen ◽  
P. E. Cryer ◽  
J. M. Miles
Keyword(s):  
Adipose Tissue ◽  
Insulin Dependent Diabetes ◽  
Response Curves ◽  
Epinephrine Infusion ◽  
Hormone Levels ◽  
Control Subjects ◽  
Insulin Dependent ◽  
Adipose Tissue Lipolysis ◽  
Plasma Hormone ◽  
Beta Hydroxybutyrate

To determine whether the sensitivity of adipose tissue lipolysis to catecholamines is increased in poorly controlled insulin-dependent diabetes, the lipolytic response to epinephrine was measured in seven nondiabetic volunteers and seven poorly controlled diabetic subjects with use of [1-(14)C]palmitate as a tracer. Subjects received sequential 1-h infusions of epinephrine, which produced epinephrine concentrations of approximately 1,000, approximately 1,750, approximately 3,500, and approximately 6,000 pmol/l. A pancreatic clamp was used to maintain constant plasma hormone levels. Concentration-response curves were constructed for each subject from the integrated lipolytic response during each epinephrine infusion. There was no difference in maximal lipolytic response (117 +/- 19 vs. 152 +/- 11 mumol.kg-1.h-1) or in maximally effective (3,171 +/- 267 vs. 3,357 +/- 349 pmol/l) or half-maximally effective (1,081 +/- 109 vs. 1,015 +/- 120 pmol/l) epinephrine concentrations between nondiabetic and diabetic subjects, respectively (all P = NS). In control subjects, maximum beta-hydroxybutyrate concentrations were achieved at lower epinephrine concentrations than those required for a maximum lipolytic effect. Thus, under pancreatic clamp conditions, the lipolytic response to epinephrine in nondiabetic and diabetic subjects was similar.

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