Abstract
The role of accumulated intrauterine fluid in rats at oestrus was investigated by experimentally altering the fluid volume in 106 rats. Complete evacuation of uterine fluid or low natural fluid volume did not significantly reduce the number of embryos on Day 10 of pregnancy overall. Transuterine (but not transcervical) sperm transport was reduced by uterine fluid removal, but did not vary significantly with naturally occurring variations in fluid content. Irrespective of fluid content, transuterine sperm transport was, on average, greater in right than left horns. Distensible balloons inserted into the uterus indicated that increasing and decreasing volume increased and decreased respectively myometrial activity at oestrus and dioestrus. Left horns contracted less frequently than did right horns at low volumes. While uterine fluid volume clearly affected uterine contractility and transuterine sperm transport, we were unable to demonstrate a major role of fluid for fertility.
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