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    
Abstract/OtherAbstract:
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.
Authors:
Helen L Bateman; Jennifer B Bond; Mark Campbell; Michael Barrie; Gary Riggs; Barb Snyder; William F Swanson
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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    
Affiliation:
Center for Conservation and Research of Endangered Wildlife, Cincinnati Zoo and Botanical Garden, Cincinnati, Ohio 45220, USA. helen.bateman@cincinnatizoo.org
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Zoo
Feces / chemistry
Female
Gonadal Steroid Hormones / metabolism*
Male
Otters / blood,  classification,  physiology*
Pregnancy
Pregnancy, Animal / physiology
Reproduction / physiology*
Seasons
Semen / physiology*
Chemical
Reg. No./Substance:
0/Gonadal Steroid Hormones

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


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