Signs of oestrus
Stockpersons must be aware of the full range of signs of proestrus to oestrus and be able to understand some basic reproductive physiology in order to accurately predict the timing of ovulation, The infusion of quality semen at the right time in the right placeis essential to successful Al,
The following key points will outline the basic rules.
This is the period just prior to standing for mating/when the gilt/sow becomes restless and is easily disturbed - duration around one day.
A proestrus female may:
Have a swollen and red vulva (more typical in gilts
but not consistently in sows)
Climb up gates and walls
Produce a watery dischargefromthe vulva
Emit a high-pitched whine
Mountother females but not stand themselves.
This is the period during which the sow is prepared to Stand for mating.
An oestrous female may:
Have a normal vulva (swelling arid reddening subsides)
Stand with tail upright and flicking up and down Have a poor appetite
Become very vocal - repeated grunts or long growls
Display pricked ears Show "standing reflex" Stand with arched back Have glazed eyes
Have a tacky discharge from the vulva
Be attracted to stockperson
Seek contact with the boar - if allowed
Stand rigid if mounted by other females
Be able to withstand the "back pressure test" in the
presence of the boar.
Not all ofthese signswill be seen in any one female. Different females exhibit oestrus in different ways and the "art of the stockperson is to be able to clearly identify and respond to the various signals displayed.