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== Age when Spermatozoa First Appear in the Ejaculate ==
 
== Age when Spermatozoa First Appear in the Ejaculate ==
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* Males acquire the ability to produce seminal fluid and ejaculate before spermatozoa are available to be ejaculated.
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* Males acquire the ability to produce seminal fluid and [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Ejaculation|ejaculate]] before spermatozoa are available to be [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Ejaculation|ejaculated]].
 
* To determine when spermatozoa first appear, the ejaculate must be collected at least once per week.
 
* To determine when spermatozoa first appear, the ejaculate must be collected at least once per week.
 
** Easy to collect using an artificial vagina from the the boar, bull, dog, ram or stallion.
 
** Easy to collect using an artificial vagina from the the boar, bull, dog, ram or stallion.
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