Document Detail

Determination of early pregnancy in ewes utilizing transrectal ultrasonography.
MedLine Citation:
PMID:  16727315     Owner:  NLM     Status:  In-Data-Review    
Transrectal ultrasonography was used in ewes to determine the earliest day at which pregnancy could be detected, the number of embryos present, and the pattern of growth of the embryos. Twenty-one ewes were placed with 2 fertile rams and 20 ewes with 2 vasectomized rams. All ewes were treated to synchronize estrus and were observed for estrus twice daily. The 36 ewes that showed synchronized estrus were separated from the rams following mating. Transrectal ultrasonography was performed daily from estrus (Day 0) to Day 25 for all ewes and on Days 30, 35 and 40 post breeding for the 20 ewes mated to fertile rams. A 7.5 MHz transducer (human prostate, linear array) was utilized, with the ewes in dorsal recumbency in a tilting squeeze chute. Extraembryonic fluid and membranes were observed in the uterine horns ipsilateral to corpora lutea by Day 15 post breeding in all 17 ewes subsequently diagnosed as pregnant. Rhythmic pulsations (heartbeat) within the embryonic vesicles were first detected on Day 18 or 19. At least 1 embryo was detected by Day 20 in all the pregnant ewes, but not all the embryos were counted accurately until Day 25 (main effect of day; P < 0.05). Two ewes each had an embryo which died (absence of previously observed heartbeat) by Day 25 or Day 40, respectively, but each maintained the remaining embryos to term. The pattern of embryonic growth, as determined by crown-rump lengths on Days 20, 25, 30, 35 and 40, did not differ with the number of embryos carried (n = 1 to 4). In conclusion, transrectal ultrasonography was found to provide a rapid, accurate means for the early detection of pregnancy in ewes.
F N Schrick; E K Inskeep
Related Documents :
20427725 - Maternal obesity and overnutrition alter fetal growth rate and cotyledonary vascularity...
9843735 - Relationship of fetal alanine uptake and placental alanine metabolism to maternal plasm...
10204415 - Temporal variations in blood glutathione peroxidase (gshpx) activity in sheep at pastur...
16727315 - Determination of early pregnancy in ewes utilizing transrectal ultrasonography.
11559905 - First trimester maternal serum placenta growth factor (pigf)concentrations in pregnanci...
17345155 - Correlates of physical activity in pregnancy among latina women.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Theriogenology     Volume:  40     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  1993 Aug 
Date Detail:
Created Date:  2006-05-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  295-306     Citation Subset:  -    
Division of Animal and Veterinary Science West Virginia University Morgantown, WV 26506, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  The effects of subnutrition on the components of the gravid uterus in the doe.
Next Document:  Use of pregnancy-specific protein-B and estrone sulfate for determination of pregnancy on Day 49 in ...