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== Blood Testing ==
 
== Blood Testing ==
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* Blood tests to measure progesterone concentration.
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* Level of progesterone required to maintain pregnancy varies.
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** Cria have been born to dams with very low plasma progesterone concentrations.
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* Variability makes blood tests unreliable.
    
== Rectal Examination ==
 
== Rectal Examination ==
    
== Foetal Heartbeat ==
 
== Foetal Heartbeat ==
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