Uterine contractions in nonpregnant and early pregnant mares and jennies as determined by ultrasonography.
Abstract: Uterine contractions in 8 nonpregnant and 13 pregnant mares were studied using ultrasonography. A 1-min video tape recording was made of longitudinal real-time images of the uterine body. An overall uterine contractile activity score (0 = no or minimal activity to 4 = maximal activity) was assigned to each video tape segment. There was a day effect (P less than .01) and an interaction (P less than .01) of reproductive status X day. Uterine activity scores were highest on d 14 to d 18 (d 0 = day of ovulation) for nonpregnant mares and on d 10 to d 14 for pregnant mares. Uterine activity scores on d 10, d 12, and d 14 were greater (P less than .02) for pregnant mares (2.5 +/- .3, 3.1 +/- .3, and 3.2 +/- .1, respectively) than for nonpregnant mares (1.2 +/- .3, 1.5 +/- .3, and 2.6 +/- .3). Uterine activity scores for six pregnant and five nonbred jennies were assigned daily from d 0 to d 24. There were main effects of reproductive status and day (P less than .01) and an interaction of status X day (P less than .01). Uterine activity scores for pregnant jennies were highest on d 13 and d 14 and then declined. In the nonbred jennies, scores were highest on d 14 to d 20. The mean score on d 13 was greater (P = .05) in pregnant jennies (2.8 +/- .2) than in nonbred jennies (1.9 +/- .5).(ABSTRACT TRUNCATED AT 250 WORDS)
Publication Date: 1988-01-01 PubMed ID: 3284864DOI: 10.2527/jas1988.661250xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
- Research Support
- U.S. Gov't
- P.H.S.
Summary
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This research investigates the uterine contractions in nonpregnant and pregnant mares and jennies (female horses and donkeys), utilizing ultrasonography. It discovers that the patterns of uterine contractions vary between pregnant and nonpregnant animals, and throughout different pregnancy stages.
Research Methodology
- The study engaged 8 nonpregnant and 13 pregnant mares.
- It employed ultrasonography to observe the uterine contractions in these subjects.
- The uterine body’s longitudinal real-time images were recorded for 1 minute as the basis for analysis.
- Each clip was assigned a uterine contractile activity score ranging from 0 (representing no or minimal activity) to 4 (representing maximal activity).
Research Findings
- The study identified a day effect (P less than .01) and an interaction of reproductive status with the day (P less than .01).
- Nonpregnant mares exhibited the highest uterine activity scores on days 14 to 18 following ovulation, while pregnant mares showed peaks in activity on days 10 to 14.
- Uterine activity scores on days 10, 12, and 14 were greater in pregnant mares than nonpregnant ones, indicating more uterine activity in early pregnancy.
- The uterine activity scores for six pregnant and five non-bred jennies were assigned daily from day 0 to day 24. Main effects of reproductive status and day along with their interaction were identified.
- Pregnant jennies presented the highest uterine activity scores on days 13 and 14 before a decline, while non-bred jennies demonstrated maximum scores on days 14 to 20.
- Mean scores on day 13 were higher in pregnant jennies as compared to non-bred ones, pointing to the greater uterine activity in early pregnancy.
Conclusions
- The research discerns distinctive patterns of uterine contractions in pregnant and nonpregnant mares and jennies across different stages of the pregnancy period.
- The findings may be valuable in veterinary medicine, especially for monitoring and managing equine pregnancies.
Cite This Article
APA
Cross DT, Ginther OJ.
(1988).
Uterine contractions in nonpregnant and early pregnant mares and jennies as determined by ultrasonography.
J Anim Sci, 66(1), 250-254.
https://doi.org/10.2527/jas1988.661250x Publication
Researcher Affiliations
- Dept. of Vet. Sci., University of Wisconsin-Madison 53706.
MeSH Terms
- Animals
- Estrus / physiology
- Female
- Horses / physiology
- Perissodactyla / physiology
- Pregnancy
- Pregnancy, Animal / physiology
- Ultrasonography
- Uterine Contraction
Grant Funding
- 1 R01 HD19771-01A1 / NICHD NIH HHS
Citations
This article has been cited 1 times.- Ulaangerel T, Mu S, Sodyelalt J, Yi M, Zhao B, Hao A, Wen X, Han B, Bou G. Transcriptome Analysis Reveals Equine Endometrium's Gene Expression Profile Around Embryo Fixation. Genes (Basel) 2025 Feb 1;16(2).
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