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* 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.
* After behavioural characteristics have developed and the male is willing to mount a receptive female/surrogate, frequent seminal collection is possible.
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* After behavioural characteristics have developed and the male is willing to [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Mounting|mount]] a receptive female/surrogate, frequent seminal collection is possible.
 
** Enables determination of the age at which spermatozoa first appear in the ejaculate.
 
** Enables determination of the age at which spermatozoa first appear in the ejaculate.
  
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