==Elimination of Bacterial Contamination of the Reproductive Tract==
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Generally, parturition in domestic animals occurs in a non-sterile environment. As a result, bacterial contamination of the reproductive tract, especially the [[Uterus - Anatomy & Physiology|uterus]], is an inevitable sequela to parturition.
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* The postpartum tract containing lochia is an ideal environment for the growth of bacteria.
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* Even though myometrial contractions remove the large volume of lochia, bacterial growth can continue.
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* Bacterial contamination is not always associated with pathology.
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* Normal post-partum events eliminate the bacterial flora within a reasonable time.
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* Elevated oestrodiol promotes leukosis in the uterus and elsewhere in the tract.
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* In some cases, high numbers of bacteria can overwhelm the natural defence mechanisms, resulting in [[Healing and Repair - Pathology#Female|postpartum uterine infection]].
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* Conditions that predispose the uterus to infection are:
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** Retained foetal membranes
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** [[Dystocia]]
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** Delay in lochial expulsion due to weak myometrial contractions.