Diagnosis of Early Pregnancy by Ultrasound in Macaca fascicularis

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Abstract
Real‐time ultrasonography was used to detect early pregnancy in 32 longtailed macaques (Macaca fascicularis ). In 92% of the successful conceptions, a correct diagnosis was made. The earliest sign of pregnancy was an intrauterine ringlike structure (11 days). A “line swelling” (14 days) preceded definite fetal echoes (21 days), and fetal heart motion (30 days) proved fetal viability. Ultrasound is a rapid, noninvasive, and relatively cost‐effective method of diagnosing and monitoring early pregnancy in M. fascicularis.
Funding Information
  • U.S. Public Health Service
  • National Institutes of Health (RR00166, ES00677, ES07032)