Pregnancy testing sows at day 21 to 28 is a very economical procedure in modern pork production.  Sows are relatively easy to ultrasound when restrained in a crate.  With more production switching to loose housing for sows, pregnancy testing is more of a challenge. 

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Pregnancy testing sows can be done very effectively with the ReproScan XTC, BoviScan Curve and the ReproScan Flexx using the 4.0 MHz convex rectal probe.  Use a deep setting so the sow’s uterus is easy to see. Most people prefer the Vista Goggles for this job.