Papers

Peer-reviewed
7 2009

Prolonged Duration of Fertility of Dog Ova

REPRODUCTION IN DOMESTIC ANIMALS
  • T. Tsutsui
  • ,
  • F. Takahashi
  • ,
  • T. Hori
  • ,
  • E. Kawakami
  • ,
  • P. W. Concannon

Volume
44
Number
First page
230
Last page
233
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1111/j.1439-0531.2009.01450.x
Publisher
WILEY-BLACKWELL PUBLISHING, INC

The fertile period for natural mating in dogs extends from before ovulation until day 5 post ovulation (PO) and involves a delay in oocyte maturation until 2-3 days PO and viability of secondary oocytes for 48-60 h or more. Spermatozoa do not enter the uterus after vaginal insemination in late oestrus. Cervical closure appears to occur on average 5 days PO, but conception may occur following intrauterine artificial insemination (IUAI) up to 8 days PO. Therefore, the present study was conducted to clarify the duration of fertility of canine ova. Using IUAI at 6, 7, 8 and 9 days PO (n = 5 bitches each) conception rates were 100%, 71.4%, 37.5% and 0%, respectively, with an average litter resorption rate of 30.8%, and with mean litter sizes and times to delivery PO being 4.3 +/- 1.6 and 64.3 +/- 0.3 days, 4.0 +/- 1.4 and 66.3 +/- 0.4 days, and 2.5 and 68 days for IUAI at 6, 7 and 8 days, respectively. The high pregnancy rates with IUAI at 6 and 7 days PO confirm that many canine oocytes are fertile at 4 5 days after maturation. The high rate of resorption was presumably because of aging of ova or asynchrony between embryonic development and the intrauterine environment.

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Link information
DOI
https://doi.org/10.1111/j.1439-0531.2009.01450.x
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/19754575
Scopus
https://www.scopus.com/record/display.uri?eid=2-s2.0-67651211040&origin=inward
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000267756400048&DestApp=WOS_CPL
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67651211040&origin=inward