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* In many species, sexual readiness is accompanied by some form of unique vocalization ('mating call').
 
* In many species, sexual readiness is accompanied by some form of unique vocalization ('mating call').
** Cows increase bellowing during '''Oestrus'''.
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** Cows increase bellowing during [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|Oestrus]].
** Sows display characteristic grunting associated with '''Oestrus'''.
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** Sows display characteristic grunting associated with [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|Oestrus]].
 
** Queens often 'yeow' repeatedly to call the tom.
 
** Queens often 'yeow' repeatedly to call the tom.
 
** Mares and Ewes are comparitively silent.
 
** Mares and Ewes are comparitively silent.
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