Document Detail

Characterization of basal seminal traits and reproductive endocrine profiles in North American river otters and Asian small-clawed otters.
MedLine Citation:
PMID:  19367624     Owner:  NLM     Status:  MEDLINE    
In this study, fecal samples were collected from 24 North American river (NARO) and 17 Asian small-clawed otters (ASCO) for 6-36 months and semen collected seasonally from NARO males (n=4/season) via electroejaculation. Our main objectives were to: (1) characterize endocrine parameters by longitudinal monitoring of fecal hormone metabolites and (2) investigate semen collection and basal seminal traits in NARO. NARO demonstrated a distinct seasonality in the spring, with females having a monoestrual estrogen elevation lasting 15.33+/-1.98 (mean+/-SEM) days and males peaking in testosterone production for 25.50+/-7.51 days. Pregnancy was characterized by 7-9 months of basal fecal progesterone, presumably corresponding to embryonic diapause, followed by a rapid increase over the final 68-73 days to term. Pseudopregnancy exhibited a similar late winter progesterone peak of 68-72 days, which could not be differentiated from pregnancy. Geographic latitude possibly influenced the timing of increased testosterone in males and increased progesterone in pregnant/pseudopregnant females. In ASCO, monitoring of fecal estrogens did not allow consistent detection of peak values associated with behavioral estrus. Both pregnancy and pseudopregnancy were characterized by a moderate rise in fecal progesterone for 14-16 days postovulation followed by a marked increase. Total gestation length was 67-77 days compared with 62-84 days for pseudopregnancy. In NARO, optimal sperm recovery and quality occurred only in the spring, corresponding with seasonal increases in testicular volume and fecal testosterone. These findings represent the first comprehensive information on normative endocrine and seminal traits in freshwater otter species.
Helen L Bateman; Jennifer B Bond; Mark Campbell; Michael Barrie; Gary Riggs; Barb Snyder; William F Swanson
Related Documents :
18098064 - Regulation of udp-glucuronosyltransferase (ugt) 1a1 by progesterone and its impact on l...
21210444 - Maternal thyroid function at 11-13 weeks of gestation in fetal trisomies 21 and 18.
21457404 - A systematic review of the management and outcomes of pregnancy in glanzmann thrombasth...
21310404 - Quintuplets after a transfer of two embryos following in vitro fertilization: a proved ...
1565394 - Exclusion of monoamniotic twinning by contrast-enhanced computed tomography.
1917274 - Further studies of lectin binding by villous and extravillous trophoblast in normal and...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Zoo biology     Volume:  28     ISSN:  1098-2361     ISO Abbreviation:  Zoo Biol.     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-04-15     Completed Date:  2009-06-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8807837     Medline TA:  Zoo Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  107-26     Citation Subset:  IM    
Center for Conservation and Research of Endangered Wildlife, Cincinnati Zoo and Botanical Garden, Cincinnati, Ohio 45220, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Animals, Zoo
Feces / chemistry
Gonadal Steroid Hormones / metabolism*
Otters / blood,  classification,  physiology*
Pregnancy, Animal / physiology
Reproduction / physiology*
Semen / physiology*
Reg. No./Substance:
0/Gonadal Steroid Hormones

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effect of dilution degree of commercial nectar and provision of fruit on food, energy and nutrient i...
Next Document:  Species identification, molecular sexing and genotyping using non-invasive approaches in two wild bo...