“…This study was to determine whether a polyethylene IUD has a similar effect on implantation in the hamster as has been reported for the rat Bo, Krueger & Garrison, 1972). Golden hamsters (Mesocricetus auratus), 60-75 days of age, were allowed free access to Purina lab chow and water and were maintained in a photoperiod of 12 hr light/24 hr.…”