PLASMA TESTOSTERONE AND SHELL QUALITY

1989 ◽  
Vol 69 (4) ◽  
pp. 1107-1109
Author(s):  
S. LEESON ◽  
C. D. BENNETT ◽  
L. J. CASTON ◽  
C. E. ANDERSON-LANGMUIR ◽  
R. J. ETCHES
Keyword(s):  
Key Words ◽  
Testosterone Level ◽  
Plasma Testosterone ◽  
Production Cycle ◽  
Testosterone Concentration ◽  
Shell Quality ◽  
Testosterone Levels ◽  
Commercial Strain ◽  
Eggshell Quality ◽  
Key Words Testosterone

Plasma testosterone levels were measured in commercial strain Leghorn pullets from 16 to 80 wk of age. Testosterone level was high just prior to first egg, but subsequently declined and stayed at a constant level through the production cycle. There was no relationship between testosterone concentration and eggshell quality (P > 0.05). Key words: Testosterone, shell quality

PLASMA LEVELS OF TESTOSTERONE IN BULLS

1978 ◽  
Vol 88 (4) ◽  
pp. 787-792 ◽  
Author(s):  
Anne Sundby ◽  
P. A. Torjesen
Keyword(s):  
Testosterone Level ◽  
Plasma Levels ◽  
Leydig Cells ◽  
Sharp Decrease ◽  
Plasma Testosterone ◽  
Plasma Samples ◽  
Elevated Plasma ◽  
Plasma Testosterone Level ◽  
Testosterone Levels ◽  
Testosterone Production

ABSTRACT Administration of 6000 IU HCG to 4 bulls was followed by an elevation of plasma testosterone lasting for 9–13 days. When HCG administration was repeated, the testosterone response was shortened to 4–6 days in 3 bulls due to the formation of antibodies against HCG. The appearance of HCG antibodies coincided with a sharp decrease in the plasma testosterone level, indicating that Leydig cells have to be under continuous HCG stimulation to maintain increased testosterone production. No antibody against bovine LH was detected in the plasma samples containing antibodies against HCG. In one bull the response following the second HCG injection was similar to the plasma testosterone pattern following the first. No antibodies against HCG were found in this bull. Five bulls received 750 IU HCG twice. Following the period with elevated plasma testosterone levels, subnormal levels were observed after both injections. One injection led to decreased levels without development of antibodies against HCG while the second HCG injection led to subnormal testosterone levels concomitant with measurable antibodies against HCG.

EFFECTS OF AN INTRAVENOUS INJECTION OF TETRACOSACTID ON PLASMA CORTICOSTEROID AND TESTOSTERONE LEVELS IN UNSTRESSED MALE RABBITS

1979 ◽  
Vol 91 (3) ◽  
pp. 511-518 ◽  
Author(s):  
K. W. Faulborn ◽  
M. Fenske ◽  
L. Pitzel ◽  
A. König
Keyword(s):  
Body Weight ◽  
Intravenous Injection ◽  
Plasma Levels ◽  
Plasma Testosterone ◽  
Rapid Rise ◽  
Testosterone Concentration ◽  
Testosterone Levels ◽  
Blood Withdrawal ◽  
Basal Plasma ◽  
Pre Treatment

ABSTRACT Administration of tetracosactid into male rabbits, fitted with permanently indwelling jugular catheters, resulted in a rapid rise of plasma corticosteroids and plasma testosterone. Corticosteroid concentrations were significantly elevated at 40 and 60 min and testosterone concentrations 20 min after the iv injection of tetracosactid (2.5, 5.0, and 10.0 μg/kg body weight), in comparison to pre-treatment levels. Corticosteroid values in plasma were elevated as long as 120 min after tetracosactid injection. In contrast, testosterone levels were lower at 60–120 min after tetracosactid injection than corresponding pre-treatment values. However, these differences were not significant. At the doses used no tetracosactiddose-dependent corticosteroid or testosterone release could be found; apparently, testosterone release is only dependent upon basal plasma levels but not upon the dose of tetracosactid applied. From these studies it is concluded that tetracosactid may bring about an increase or decrease of testosterone concentration in plasma in the buck depending upon the length of time elapsing between injection of tetracosactid and blood withdrawal.

scholarly journals Prepubertal Serum Testosterone Concentration In Vembur Rams At Different Rearing System

2017 ◽  
Vol 12 (4) ◽  
Author(s):  
R. Selvakkumar ◽  
T. Sivakumar ◽  
S. Ganesh Kumar ◽  
P. Anuradha
Keyword(s):  
Field Condition ◽  
Testosterone Level ◽  
Serum Testosterone ◽  
Serum Testosterone Level ◽  
Testosterone Concentration ◽  
Testosterone Levels ◽  
Ram Lambs ◽  
Age At Puberty

The present investigation was carried out to study the prepubertal testosterone pattern and age at puberty in Vembur rams reared under farm and farmers field condition. A total number of 8 Vembur ram lambs each from farm and farmers field were selected. The measurement of testosterone was performed by Radioimmunoassay (RIA). The serum testosterone level from 6th to 20th month of age ranged from 0.132 ± 0.04 to 3.823 ng/ml in semi intensively maintained farm males and 0.138±0.04 to 3.456±0.17 ng/ml in animals maintained at farmer’s holdings. The serum testosterone levels were crossing the concentration of 2.5 ng/ml at the age of 17 to 18th weeks and successful mounting, intromission and ejaculation were noticed after this age.

scholarly journals SUN-044 Gonadotropin Releasing Hormone (GnRH) Agonist Therapy Induces a Sustained Reduction in Plasma Testosterone Levels and Is Well Tolerated in Transwomen Veterans

2020 ◽  
Vol 4 (Supplement_1) ◽  
Author(s):  
Lyan Gondin ◽  
Jonathan Trejo ◽  
Sheila Pinkson ◽  
xi chen ◽  
Emina Case ◽  
...  
Keyword(s):  
Lipid Profile ◽  
Gnrh Agonist ◽  
Estrogen Therapy ◽  
Plasma Testosterone ◽  
Rapid Decline ◽  
Agonist Therapy ◽  
Testosterone Concentration ◽  
Testosterone Levels

Abstract Gender affirming hormone therapy (GAHT) is the mainstay of long-term management of transgender individuals. In transwomen, treatment with physiologic doses of estrogen alone is often insufficient to suppress testosterone to the desired level. Although GnRH agonist therapy is usually prescribed for puberty suppression in trans youth, in adult transwomen, GnRH agonist may be added. The durability of long-term GnRH agonist in lowering testosterone as well as the long-term safety is not clear. We examined the effect of leuprolide a GnRH agonist, on testosterone as well as clinical and metabolic features in transwomen Veterans. Out of 91 subjects with gender dysphoria followed at a VA Endocrinology clinic, 65 were transwomen (age 49 ± 3 years) who had a detailed clinical, biochemical and hormonal profile (lipid profile, HbA1C, FPG, testosterone, estradiol). We performed a retrospective cohort study of the 31 (48%) transwomen on Leuprolide (3.375mg q month) and 33 transwomen who were not on Leuprolide. Plasma testosterone, lipid profile, were analyzed before, 6 months, 1 year and at the last follow-up visit. The median follow-up of subjects on Leuprolide was 2.7 (1.7-3.8) years. Plasma testosterone concentration declined by 89% from 432±32 ng/dl to 47±9 ng/dl within 3-6 months after initiation of GnRH agonist treatment. Plasma testosterone remained persistently low 39±4ng/dl at 1 year and at the end of 2.7 yrs, most subjects on Leurprolide had plasma testosterone concentration <50ng/dl. Leuprolide therapy led to similar rapid decline in testosterone concentration in both younger (<40yrs) or relatively older (>50yr) transwomen. Leuprolide was in general well tolerated requiring discontinuation in just one patient due to severe fatigue. Three subjects (10%) experienced hot flashes which did not lead to discontinuation of medication. In the non-Leuprolide group, of 33 subjects, the follow-up was relatively inconsistent and only 12 subjects were regularly followed throughout a year with stable treatment. The decline in plasma testosterone was of a lower magnitude versus the leuprolide group (55% vs 89%, p <0.05). The testosterone levels declined from 393±42 to 180±44 ng/dl at 6 months. Body weight, and lipid profile: triglyceride, and plasma HDL concentration did not change significantly with or without GnRH agonist therapy. In conclusion, GnRH agonist therapy led to a sustained suppression of plasma testosterone levels in transwomen and was not associated with worsening lipid profile, was effective, and well tolerated in transwomen regardless of their age and may be considered an adjunct to the ant-androgen and estrogen therapy.

Plasma concentrations of testosterone and luteinizing hormone in rutting reindeer bulls (Rangifer tarandrus)

1980 ◽  
Vol 58 (11) ◽  
pp. 2081-2083 ◽  
Author(s):  
K.-A. Stokkan ◽  
K. Hove ◽  
W. R. Carr
Keyword(s):  
Luteinizing Hormone ◽  
Testosterone Level ◽  
Plasma Concentrations ◽  
Plasma Testosterone ◽  
Plasma Samples ◽  
Diurnal Pattern ◽  
Testosterone Concentration ◽  
Peripheral Plasma ◽  
The Mean

Concentrations of plasma testosterone and luteinizing hormone (LH) were measured in peripheral plasma from semidomestic, rutting reindeer bulls. Although the concentrations of plasma testosterone were high and showed large variations, those of LH were low and only a few episodic bursts could be detected in hourly samples taken throughout a 48-h period. The mean testosterone concentration in three bulls differed significantly and ranked the animals according to their position in a fighting hierarchy. The mean concentrations of LH did not differ significantly. Plasma samples from one reindeer bull sampled every 20 min for periods of 3 h indicated that an increment in LH concentration preceded a peak in testosterone. No diurnal pattern in testosterone concentrations could be detected, but testosterone peaks seemed to appear about every 3–4 h. The present study thus demonstrates that a series of plasma samples throughout the day is necessary to determine a true "testosterone level" in the reindeer bull.

Seasonal changes in plasma testosterone concentration and mating activity in Border Leicester, Poll Dorset, Romney and Suffolk rams

1983 ◽  
Vol 23 (122) ◽  
pp. 248 ◽  
Author(s):  
MJ D'Occhio ◽  
DE Brooks
Keyword(s):  
Seasonal Changes ◽  
Extended Period ◽  
Field Conditions ◽  
Plasma Testosterone ◽  
Real Relationship ◽  
Mating Activity ◽  
Testosterone Concentration ◽  
Testosterone Levels ◽  
Seasonal Peak ◽  
Precise Time

Seasonal changes in the plasma testosterone profile and mating activity were compared for Border Leicester, Poll Dorset, Romney and Suffolk rams (three of each breed) maintained under field conditions at latitude 35�S. Border Leicester, Romney and Suffolk showed maximum testosterone levels from February to May. Peak mating activity occurred from March to August, but the precise time and duration of the peak differed between the three breeds. A correlation (r = 0.65, P<0 .05) existed between seasonal changes in plasma testosterone and mating activity in Border Leicester but not in Romney or Suffolk. However, in all three breeds, peak testosterone levels preceded peak mating activity by 1-2 months. Poll Dorset rams showed an extended period of high testosterone levels from August to March but no seasonal peak in mating activity. There was no real relationship, in any breed, between plasma testosterone concentration and mating activity for individual rams within any month.

INCREASE IN PLASMA TESTOSTERONE CONCENTRATION AFTER INJECTION OF ADRENOCORTICOTROPHIN INTO THE BOAR

1975 ◽  
Vol 66 (1) ◽  
pp. 123-131 ◽  
Author(s):  
R. M. LIPTRAP ◽  
J. I. RAESIDE
Keyword(s):  
Adrenal Cortex ◽  
Plasma Testosterone ◽  
Adrenocorticotrophic Hormone ◽  
Rapid Rise ◽  
Testosterone Concentration ◽  
Testosterone Levels

SUMMARY Injection of a 'rapid-acting' preparation of porcine adrenocorticotrophic hormone (ACTH) into three boars resulted in a rapid rise in plasma testosterone levels which accompanied the expected rise in plasma corticosteroids. Urinary dehydroepiandrosterone (DHA) levels were measured in one boar and were found to be raised also. The results suggest that the effect involved enhanced testicular steroid activity and was related to the dosage of ACTH employed. This action of ACTH is thought to be mediated through the adrenal cortex since injection of cortisol elicited a rise in testosterone similar to that observed after injection of ACTH. ACTH had no effect on testosterone levels in a castrated boar. When a 'longacting' preparation of ACTH was administered to two boars twice daily for 5 days, testosterone levels were depressed. It was concluded that ACTH may bring about an increase or a decrease in plasma testosterone levels in the boar depending upon the length of time increased levels of ACTH are present in the circulation.

THE EFFECT OF MAINTENANCE HAEMODIALYSIS AND RENAL TRANSPLANTATION ON THE PLASMA TESTOSTERONE LEVELS OF MALE PATIENTS IN CHRONIC RENAL FAILURE

1975 ◽  
Vol 80 (3) ◽  
pp. 577-582 ◽  
Author(s):  
J. Alaghband Zadeh ◽  
K. G. Koutsaimanis ◽  
A. P. Roberts ◽  
R. Curtis ◽  
J. R. Daly
Keyword(s):  
Renal Failure ◽  
Circadian Rhythm ◽  
Renal Transplantation ◽  
Chronic Renal Failure ◽  
Testosterone Level ◽  
Plasma Testosterone ◽  
Plasma Testosterone Level ◽  
Testosterone Levels ◽  
Maintenance Haemodialysis ◽  
Male Patients

ABSTRACT Plasma testosterone levels were measured at the beginning of a 14 h period of haemodialysis, one hour later, midway through the period and at the end, in 18 male patients in chronic renal failure. The level fell from 8.70 ± 2.63 nmol/l at the start to 8.08 ± 3.33 nmol/l at the midpoint, and rose again to 10.12 ± 3.9 nmol/l at the end of a dialysis. All seven of the patients tested on a non-dialysis day showed similar levels at the same time. At the beginning of a 10 h dialysis period 19 other male patients showed a plasma testosterone level of 10.12 ± 3.99 nmol/l and, at the end, of 8.98 ± 4.54 nmol/l. Over the same period the plasma corticosteroids rose from 301 ± 101 nmol/l to 483 ± 199 nmol/l. Eight male patients who had had successful renal transplantation had plasma testosterone levels of 15.08 ± 7.49 nmol/l. It is concluded that the plasma testosterone is low in chronic renal failure, but the circadian rhythm is preserved. Treatment with maintenance haemodialysis does not itself affect the plasma testosterone level, or alter the circadian rhythm despite the procedure's being a stress. Successful renal transplantation restores the plasma testosterone to normal in most cases.

Seasonal variation in the plasma testosterone concentration of reindeer and caribou

1973 ◽  
Vol 51 (6) ◽  
pp. 651-658 ◽  
Author(s):  
P. E. Whitehead ◽  
E. H. McEwan
Keyword(s):  
Seasonal Variation ◽  
Growth Pattern ◽  
Seasonal Changes ◽  
Seasonal Pattern ◽  
Plasma Testosterone ◽  
Endocrine Glands ◽  
Testosterone Concentration ◽  
Testosterone Levels ◽  
Rhythmic Growth ◽  
Two Hybrid

Plasma testosterone levels of reindeer increased from 1 ng/cm3 in August to 30–60 ng/cm3 in mid-September. By late October, when rutting activity had almost ceased, the testosterone concentration had declined to barely detectable levels. The seasonal pattern exhibited by caribou was similar except the peak levels associated with rutting occurred about 1 month later than reindeer. The seasonal changes in plasma testosterone levels of two hybrid calves were studied. Peak testosterone levels of 5 and 3.8 ng/cm3 were attained in late October.The influence of the endocrine glands on antler renewal and casting, and the rhythmic growth pattern exhibited by caribou and reindeer are discussed.

scholarly journals The Antler Cycle and Fecal Testosterone of Male Sambar Deer Rusa unicolor unicolor at the Horton Plains National Park in Sri Lanka

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
D. S. Weerasekera ◽  
S. J. Perera ◽  
D. K. K. Nanayakkara ◽  
H. M. S. S. Herath ◽  
A. N. L. Rathnasekara ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Testosterone Level ◽  
National Park ◽  
Growth Stages ◽  
Testosterone Concentration ◽  
Testosterone Levels ◽  
Antler Growth ◽  
Antler Cycle ◽  
Sambar Deer ◽  
Fecal Testosterone

This study is aimed at evaluating the relationship between endogenous testosterone levels and antler development in male sambar deer (Rusa unicolor unicolor) inhabiting the Horton Plains National Park, Sri Lanka. Seven antler growth stages of sambar were documented based on phenotypic observations for the first time in Sri Lanka as (a) cast, (b) growing 1—single spike, (c) growing 2—antler fork into a Y as the second tine appears, (d) growing 3—velvet begins to harden as the third tine appears, (e) growth completed—velvet shedding begins, (f) hard antler, and (g) casting. Fecal samples were collected every month for a period of eighteen months from male sambar deer in different stages of the antler growth cycle, feeding in the wet patana grasslands of the park, and the fecal testosterone level was estimated by radioimmunoassay. Ten animals were randomly selected from each antler stage for the experiment. The results disclose that the highest concentrations of testosterone were recorded in the hard antler stage. Velvet shedding was preceded by an increase in the testosterone level, and it is the sudden drop in the testosterone concentration which triggers the antler casting. The casting stage corresponded with the lowest mean testosterone concentration. Although the study was able to conclude a clear relationship between the fecal testosterone levels of the male sambar deer in the Horton Plains National Park and their antler stages, there is no clear seasonality for the antler cycle.

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