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  • Title: Effect of intrauterine saline infusion during the late luteal phase on the estrous cycle and luteal function of the mare.
    Author: Neely DP, Stabenfeldt GH, Kindahl H, Hughes JP, Kendrick JW.
    Journal: Am J Vet Res; 1979 May; 40(5):665-8. PubMed ID: 573079.
    Abstract:
    The intrauterine infusion of 500 ml of warm sterile saline solution into mares on days 12, 13, or 14 after ovulation failed to alter the ovulatory interval, although intervals were shorter for days 12 and 13 (20.6 days) when compared with those in control mares (21.6 days). The IU fusion shortened luteal-life-span on days 12 (12.0 vs 13.8 days) and 13 (13.0 vs 14.4 days) (P is less than 0.05), but not day 14 (14.0 vs 13.5 days), when comparing the effects of IU infusion with an average of before and after base-line data. There was no effect on the interval from corpus luteum regression to ovulation, ie, the final follicular phases. The treatment average for days 12 and 13 combined was 7.7 days vs 7.3 days for controls. Also, no significant effect was observed for the duration of estrus in that the treatment average for days 12 and 13 was 5.1 days, and for controls, 6.0 days. The infusion of saline solution caused an immediate release of prostaglandin F(2alpha) within 5 minutes, with additional large releases occurring over the next 24 hours. Progestin concentrations decreased rapidly in relation to this prostaglandin release.
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