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Uterine Environment in Early Pregnancy

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Embryonic Mortality in Farm Animals

Part of the book series: Current Topics in Veterinary Medicine and Animal Science ((CTVM,volume 34))

Abstract

Mammalian species have developed an extraordinary biochemical and endocrinological diversity to ensure reproduction. But in all species synchrony between maternal and embryonic development is obligatory to establish pregnancy. The composition of the uterine environment during the preimplantation period which represents an essential part of this synchrony will be reviewed.

The over-all quality of the uterine environment — the maternal “soil” —is predominantly a permissive one. It determines reproductive performance of the female but has no inductive function on the genetically autonomous conceptus (quality of the “seed”).

Analogous to embryonic development uterine secretions change quantitatively and qualitatively during early pregnancy. Among uterine secretory components, the proteins have been investigated most extensively and in many species. Most are of blood serum origin. But uterine proteins synthesized de novo by the endometrium also contribute — in some species to a considerable amount — to uterine luminal fluid during the preimplantational period. Typical protein pattern changes have been demonstrated as well as variations in enzyme activities. In some species pregnancy specific proteins have been identified representing embryonic-maternal interaction in early pregnancy. Uterine secretory activity is controlled by maternal hormones. In the rabbit, it has been shown that hormones dispose a complete inherent endometrial secretory programme.

Synchrony is defined by the hormonally controlled composition of the uterine luminal fluid in total (and not by single components) and by the cyclic changes occuring during the preimplantation period. An inadequate uterine milieu provokes embryonic mortality which is of importance in humans as well as in farm animals.

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Fischer, B., Beier, H.M. (1986). Uterine Environment in Early Pregnancy. In: Sreenan, J.M., Diskin, M.G. (eds) Embryonic Mortality in Farm Animals. Current Topics in Veterinary Medicine and Animal Science, vol 34. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5038-2_6

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  • DOI: https://doi.org/10.1007/978-94-009-5038-2_6

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