Abstract

Data from three cases have been used to create a single growth curve for orangutan (Pongo spp.) fetal development. This project creates and compares specific growth curves (e.g., Bornean vs. Sumatran, and male fetus vs. female fetus) and gestation lengths for orangutans by developing a database using existing ultrasound and breeding information as well as information collected from multiple institutions going forward. The protocol describes detailed guidelines for study participation including breeding data parameters, specific ultrasound views, points to measure, and frequency of collection. A standardized form has been created for institutions to complete and a single certified ultrasonographer is used for analysis in order to make the data as uniform and reliable as possible. Specific data points collected in this study include copulation date, last known menses, birth date, and fetal ultrasound measurements of crown rump length (CRL), biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), femur length (FL), and humerus length (HL).

Acknowledgments

The authors wish to thank the Toledo Zoo management and husbandry staff for their time and support with this project.