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Technique	Test Type	Application of Test After Breeding (Accuracy)
Estrus detection	Indirect	Daily testing 18–25 days (75%–85%) and through gestation (98%)
External physical signs	Indirect	>55 days (gilts); >84 days (sows)
Rectal palpation (sows)	Indirect	30 days (94%), >60 days (100%)
Ultrasonography A-mode Doppler Real-time (B-mode)	Indirect Direct/Indirect Direct	30–75 days (95%) ≥35 days (>85%) ≥24 days (>95%)