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== Age when the Ejaculate Contains a Threshold Number of Spermatozoa ==
 
== Age when the Ejaculate Contains a Threshold Number of Spermatozoa ==
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* Even if the ejaculate contains spermatozoa, there may be insufficient numbers for optimum fertilization.
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* The presence of a threshold (minimum number) of spermatozoa is required.  These thresholds vary between species.
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* Reflect minimum seminal characteristics required to achieve pregnancy following copulation.
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* Practically, this is the most valid criterion for puberty in the male.
    
= Female =
 
= Female =
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