Document Detail

Pseudopregnancy in harp seals (Phoca groenlandica).
MedLine Citation:
PMID:  8064690     Owner:  NLM     Status:  MEDLINE    
Concentrations of circulating progesterone were monitored in a captive breeding group of harp seals. Five females were monitored for 2 years, over which time they either became pregnant (four instances) or displayed an overt pseudopregnancy (five instances). Only one female exhibited consecutive pseudopregnancies. In all pseudopregnancies, serum progesterone values were high and remained high until July, which is close to the time when implantation normally occurs. After this time progesterone concentrations remained high, gradually declining to baseline values over the following four months. In the three females that were pregnant one year and pseudopregnant in the other year, the average progesterone concentration during pseudopregnancy was lower than that exhibited during pregnancy (P < 0.05). All females (except one) increased their mass, girth and condition index over the normal gestation period whether they were pregnant or pseudopregnant. The potential consequences of such a high rate of pseudopregnancy on the use of ovarian scars for estimating reproductive rates and population size are discussed.
D Renouf; R Taylor; R Gales
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of reproduction and fertility     Volume:  101     ISSN:  0022-4251     ISO Abbreviation:  J. Reprod. Fertil.     Publication Date:  1994 May 
Date Detail:
Created Date:  1994-09-22     Completed Date:  1994-09-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376367     Medline TA:  J Reprod Fertil     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  31-6     Citation Subset:  IM    
Ocean Sciences Centre, Memorial University of Newfoundland, St John's, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Body Weight / physiology
Pregnancy, Animal / blood*
Progesterone / blood*
Pseudopregnancy / blood*
Seals, Earless / blood*,  growth & development
Reg. No./Substance:

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

Previous Document:  Endothelin production by bovine oviduct epithelial cells.
Next Document:  Water volume and osmotic behaviour of mouse spermatozoa determined by electron paramagnetic resonanc...