Pregnancy
Diagnosis
Understanding real time ultrasound pictures
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Probe
position |
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Place probe against flank aim
just behind opposite shoulder and slowly rotate hand backwards |
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Pregnancy
diagnosis
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1-115 days |
In
the presence of the boar
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18-24 days |
In
the presence of the boar checking for regular oestrus return |
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25-34 days |
In the
presence of the boar to check for late returns |
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28 days |
With
the Doppler machine for uterine pulse Real
time ultrasound |
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35 days |
With
the Doppler machine for uterine pulse |
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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 |
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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 |
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Always
check that the Doppler machine is well serviced and has a well charged
battery |
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Regularly
re-listen to the teaching tape |
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Use
plenty of gel between the head and the sow's body wall |
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Interpretation |
A
sow which records one negative
must be rechecked the following day |
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A
sow with two negatives must go back to the boar and be rechecked |
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A
sow wrongly believed to be in pig post 35 days costs you around 7
kg deadweight produced a day |
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Result
interpretation using a Doppler |
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28 days |
35 days |
Significance |
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Result |
+ve |
+ve |
Pregnant |
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Result |
-ve |
+ve |
Coming into
second oestrus return |
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Result |
+ve |
-ve |
Embryonic death
possibly |
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Result |
-ve |
-ve |
Not pregnant |
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Extension holder
for a real-time probe
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Real time ultrasound analysis |
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None pregnant loops of gut showing |
Ovarian Follicles and uterine outline |
Sow in oestrus |
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Pregnancy foetal vesicles at 28 days. It is essential to visualise the foetus within the vesicle |
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Foetal skeleton |
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