A comparison of fecal steroid metabolite concentrations between harem and bachelor stallions in a free-Ranging population of przewalski's horses (Equus ferus przewalskii)

Zoo Biology ◽  
2017 ◽  
Vol 36 (2) ◽  
pp. 127-131
Author(s):  
Maureen D'Souza-Anjo ◽  
Bruce W. Christensen ◽  
Kristin Brabender ◽  
Waltraut Zimmermann ◽  
Philip H. Kass ◽  
...  
Keyword(s):  
Fecal Steroid ◽  
Metabolite Concentrations ◽  
Free Ranging ◽  
Steroid Metabolite

scholarly journals Assessment of fecal steroid and thyroid hormone metabolites in eastern North Pacific gray whales

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Leila S Lemos ◽  
Amy Olsen ◽  
Angela Smith ◽  
Todd E Chandler ◽  
Shawn Larson ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
North Pacific ◽  
Reference Points ◽  
Future Research ◽  
Vital Rates ◽  
Baleen Whale ◽  
Gray Whales ◽  
Fecal Steroid ◽  
Metabolite Concentrations ◽  
The Impact

Abstract Baleen whale fecal samples have high potential for endocrine monitoring, which can be used as a non-invasive tool to identify the physiological response to disturbance events and describe population health and vital rates. In this study, we used commercial enzyme-linked immunosorbent assays to validate and quantify fecal steroid (progestins, androgens and glucocorticoids) and thyroid hormone metabolite concentrations in eastern North Pacific gray whales (Eschrichtius robustus) along the Oregon coast, USA, from May to October of 2016–2018. Higher mean progestin metabolite concentrations were observed in postweaning females, followed by pregnant females. Mean androgen, glucocorticoid and thyroid metabolites were higher in mature males. Progestin, glucocorticoids and thyroid fecal metabolites varied significantly by year, with positive correlations between progestin and androgen, and between glucocorticoid and thyroid metabolites. We also present two case studies of a documented injured whale and a mature male displaying reproductive competitive behavior, which provide reference points for physiologically stressed individuals and adult breeding males, respectively. Our methods and findings advance the knowledge of baleen whale physiology, can help guide future research on whale physiology and can inform population management and conservation efforts regarding minimizing the impact of anthropogenic stressors on whales.

scholarly journals A predictive model to diagnose pregnancy in guanacos (Lama guanicoe) using non-invasive methods

2020 ◽  
Vol 98 (1) ◽  
pp. 13-20
Author(s):  
A. Marozzi ◽  
V.I. Cantarelli ◽  
F.M. Gomez ◽  
A. Panebianco ◽  
L.R. Leggieri ◽  
...  
Keyword(s):  
Predictive Model ◽  
Large Scale ◽  
Population Studies ◽  
Lama Guanicoe ◽  
Non Invasive ◽  
Pregnant Females ◽  
Metabolite Concentrations ◽  
Scale Population ◽  
Pregnancy Status ◽  
Free Ranging

Pregnancy status is usually not included in ecological studies because it is difficult to evaluate. The use of non-invasive methods to determine pregnancy, without physically restraining individuals, would enable pregnancy to be included in population studies. In this study, we evaluated sex steroid hormones in plasma and fecal samples from pregnant and non-pregnant females to develop a pregnancy predictive model for guanacos (Lama guanicoe (Müller, 1776)). Samples were obtained during live-shearing management (i.e., capture, shear, and release) of guanacos. Enzyme immunoassays were used to evaluate progesterone (P4) and estradiol (E2) concentrations in plasma and pregnanediol glucuronides (PdG) and conjugated estrogens (EC) in feces. Mean hormonal and fecal metabolite concentrations were significantly higher in pregnant females than in non-pregnant females. A linear relationship was found between each hormone and its fecal metabolite. Finally, hormonal data were combined with an independent source of pregnancy diagnosis such as abdominal ballottement to develop a logistic regression model to diagnose pregnancy in non-handled individuals. The use of predictive models and non-invasive methods might be suitable to incorporate pregnancy information in large-scale population studies on guanaco and other free-ranging ungulates.

scholarly journals Age and socially related changes in fecal androgen metabolite concentrations in free-ranging male giraffes

2018 ◽  
Vol 255 ◽  
pp. 19-25 ◽  
Author(s):  
T.E. Wolf ◽  
F.S. Schaebs ◽  
N.C. Bennett ◽  
R. Burroughs ◽  
A. Ganswindt
Keyword(s):  
Metabolite Concentrations ◽  
Free Ranging

Aldosterone Deficiency in Infancy

1988 ◽  
Vol 33 (3) ◽  
pp. 275-276
Author(s):  
I.A. Glass ◽  
A.M. Wallace ◽  
T.J. Beattie
Keyword(s):  
Plasma Renin ◽  
Definitive Diagnosis ◽  
Plasma Aldosterone ◽  
Correct Interpretation ◽  
Salt Wasting ◽  
Metabolite Concentrations ◽  
Steroid Metabolite ◽  
Urinary Steroid

Two infants with a chronic salt wasting state secondary to a rare defect in mineralocorticoid synthesis are described. Management difficulties are illustrated highlighting the need for early definitive diagnosis based on measurement and correct interpretation of plasma renin, plasma aldosterone and urinary steroid metabolite concentrations.

scholarly journals Putative drivers of adrenocortical activity in captive African lesser bushbaby (Galago moholi)

2017 ◽  
Vol 95 (10) ◽  
pp. 787-795 ◽  
Author(s):  
J. Scheun ◽  
N.C. Bennett ◽  
J. Nowack ◽  
P.N. Laver ◽  
A. Ganswindt
Keyword(s):  
Reproductive Activity ◽  
Graphical Analysis ◽  
Sample Collection ◽  
Mixed Effect ◽  
Biologically Relevant ◽  
Adrenocortical Activity ◽  
Metabolite Concentrations ◽  
Galago Moholi ◽  
Adrenocortical Hormone ◽  
Free Ranging

In seasonal breeders, periods of reproductive activity often coincide with high levels of glucocorticoids. We studied seven male and seven female African lesser bushbabies (Galago moholi A. Smith, 1836) over two mating periods via noninvasive faecal hormone metabolite monitoring to investigate the relationship between reproductive and adrenocortical hormone activity. We used linear mixed-effect models to investigate the effect of physiological (endocrine) variables on faecal glucocorticoid metabolite concentrations. Our results indicate faecal androgen (males) and progestagen metabolite (females) concentrations as the variables best able to explain variability in faecal glucocorticoid metabolite concentrations. However, the models explained only a fraction (26% and 12%, respectively) of the observed variability and graphical analysis suggests a biologically relevant difference in faecal glucocorticoid metabolite concentrations between captive and free-ranging animals during nonreproductive periods. Thus, captivity may have affected glucocorticoid output in our focal animals, potentially weakening the expected relationship between reproductive activity and faecal glucocorticoid metabolite variability. Due to the ease of faecal and observational sample collection, a large number of studies monitoring adrenocortical activity in wildlife are conducted using only captive settings, with inferences unquestioned when applied to free-ranging scenarios. Our study cautions against this practice, as particular housing or management conditions may influence the pattern of adrenocortical activity.

Use of Fecal Steroid Metabolites to Estimate the Pregnancy Rate of a Free-Ranging Herd of Tule Elk

1999 ◽  
Vol 63 (2) ◽  
pp. 561 ◽  
Author(s):  
Monica A. Stoops ◽  
Gary B. Anderson ◽  
Bill L. Lasley ◽  
Susan E. Shideler
Keyword(s):  
Pregnancy Rate ◽  
Fecal Steroid ◽  
Tule Elk ◽  
Free Ranging

Diagnosing pregnancy in free-ranging dugongs using fecal progesterone metabolite concentrations and body morphometrics: A population application

2012 ◽  
Vol 177 (1) ◽  
pp. 82-92 ◽  
Author(s):  
Elizabeth A. Burgess ◽  
Janet M. Lanyon ◽  
Janine L. Brown ◽  
David Blyde ◽  
Tamara Keeley
Keyword(s):  
Metabolite Concentrations ◽  
Free Ranging ◽  
Progesterone Metabolite

Fecal steroid analysis of ovarian cycles in free-ranging baboons

1995 ◽  
Vol 36 (4) ◽  
pp. 285-297 ◽  
Author(s):  
Ronda Stavisky ◽  
Elizabeth Russell ◽  
Joy Stallings ◽  
E. O. Smith ◽  
Carol Worthman ◽  
...  
Keyword(s):  
Fecal Steroid ◽  
Steroid Analysis ◽  
Free Ranging ◽  
Ovarian Cycles
Sign in / Sign up

Export Citation Format

Share Document