Production, chemical composition and prostaglandin F-2 content of uterine fluid in pregnant sheep

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Abstract
A uterine pouch was prepared surgically in ewes before mating to study the production and chemical composition of uterine secretions during pregnancy. Pregnancy was established in 6 sheep, and in the first 55 days uterine fluid was present in small amounts (> 5 ml), whereas between 109 days post coitum and 3 days post partum the volume ranged from 90-775 ml. The chemical composition of uterine fluid in pregnancy differed from that of plasma especially in respect to its high concentration of total Ca (up to 83.5 mM) and prostaglandin (PG) F-2.alpha. (up to 1500 ng/ml). Progesterone was implicated as an important endocrine factor since uterine fluid (188 ml) with a high concentration of total Ca (53.5 mM) and PGF-2.alpha. (235 ng/ml) was recovered from a non-pregnant sheep treated with progesterone for 115 days.

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