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  • Title: Effects of ecbolic agents on measurements of uterine involution in the mare.
    Author: Blanchard TL, Varner DD, Brinsko SP, Quirk K, Rugila JN, Boehnke L.
    Journal: Theriogenology; 1991 Oct; 36(4):559-71. PubMed ID: 16727027.
    Abstract:
    Thirteen postparturient mares were used to investigate the effects of ecbolic agents on the rate of uterine involution. Mares were randomly assigned to one of three treatment groups: Group S = intravenous injection of 2 ml saline twice daily for 10 days post partum (n=4); Group O = intravenous injection of 20 units oxytocin twice daily for 10 days post partum (n=4); and Group P = intramuscular injection of 500 mcg fluprostenol twice daily for 10 days post partum (n=5). Ovulation was determined by daily transrectal ultrasonographic examination of the ovaries. On Days 6, 11 and 16 post partum, transrectal ultrasonography was used to measure cross-sectional diameters of the uterine body, uterine horns and fluid within the uterine lumen. Uteri were swabbed for aerobic bacteriologic culture on Days 11 and 16 post partum. Uterine biopsies were obtained from the base of the previously gravid uterine horn on Days 11 and 16 post partum for subjective assessment of endometritis and morphometric analysis of endometrial histoarchitecture. Mean values for all measurements of uterine involution did not differ among groups (P>0.05). For all mares, the diameter of luminal fluid was not correlated to diameter of the uterine body or uterine horns, or to morphometric measurements of endometrial histoarchitecture of the previously gravid uterine horn (P>0.05). Likewise, accumulation of fluid within the uterine lumen was not associated with endometritis or recovery of potential bacterial pathogens (P>0.05). Mean diameter of the previously gravid uterine horn was negatively correlated with morphometric measures of endometrial histoarchitecture of the previously gravid uterine horn (P<0.01).
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