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== Pheramones ==
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* Secretions from the female reproductive tract that serve to sexually stimulate and attract males to the female.
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* Vaginal and urinary secretions from females in '''Oestrus''' smell different to the male then secretions of females not in Oestrus.
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* Pheramone is a volatile substance released to the outside of the body and perceived by the olfactory system and/or activated by the vomeronasal organ.  Releasing pheramones can cause specific behaviour in the recipient.
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* Males also produce sex pheramones.
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** Boars produce specific substances that cause sows and guilts to become sexually aroused when they are in '''oestrus'''.
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** Two sexual attractants are produced by boars:
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*** Preputial pouch secretion
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*** Pheramonal substance in saliva secreted by the submaxillary salivary gland.
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**** During sexual excitement, the boar produces copious quantities of foamy saliva.  The active components in saliva are the androgen metabolites 3
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