Pregnancy Diagnosis

Understanding real time ultrasound pictures

 

Probe position

 

Pregnancy%20checking%202

Pregnancy%20probe

Pregnancy%20checking

Place probe against flank aim  just behind opposite shoulder and slowly rotate hand backwards

Pregnancy

diagnosis

 

Pregnant%20sow

1-115 days

In the presence of the boar

18-24 days

In the presence of the boar checking for regular oestrus return

25-34 days

In the presence of the boar to check for late returns

28 days

With the Doppler machine for uterine pulse

Real time ultrasound

35 days

With the Doppler machine for uterine pulse

8 weeks

By eye, looking for dropped abdomen

Any questionable sow, recheck with Doppler for uterine pulse and foetal pulse or real time for foetus

False positives

False uterine pulse when the sow is coming or in season.  This is why you need two positives (28 and 35 days) to be confident that the sow is pregnant 

Always check that the Doppler machine is well serviced and has a well charged battery

Regularly re-listen to the teaching tape

Use plenty of gel between the head and the sow's body wall

Interpretation

A sow which records one negative must be rechecked the following day

A sow with two negatives must go back to the boar and be rechecked

A sow wrongly believed to be in pig post 35 days costs you around 7 kg deadweight produced a day

Result interpretation using a Doppler

28 days

35 days

Significance

Result

+ve

+ve

Pregnant

Result

-ve

+ve

Coming into second oestrus return

Result

+ve

-ve

Embryonic death possibly

Result

-ve

-ve

Not pregnant

 

Extension holder for a real-time probe


 

Real time ultrasound analysis

Preultra%20open

Preultra%20ovary

Preultraoestrus

None pregnant loops of gut showing

Ovarian Follicles and uterine outline

Sow in oestrus

Preultraearly1

Pregultraearly2

Pregnancy foetal vesicles at 28 days.   It is essential to visualise the foetus within the vesicle

Pregultraskeleton%202

Preultraskeleton%201

Foetal skeleton