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ABNORMAL FETAL DEVELOPMENT IN THE MARMOSET (CALLITHRIX JACCHUS)

Department of Obstetrics and Gynaecology, Hormone Laboratory, Simpson Memorial Maternity Pavilion, Royal Infirmary, Edinburgh EH3 9W, and M.R.C. Laboratory Animals Centre, Carshalton

(Received 28th February 1975)

Perinatal mortality and the frequency of fetal abnormalities is greater in human multiple pregnancies than it is in single pregnancies (Bulmer, 1970). Multiple births are a regular feature of reproduction in non-human primates of the genus Callithrix, twins being the normal number of young although one or three may sometimes be born (Napier & Napier, 1967). Hill (1969) has pointed out that marmosets (Callithrix jacchus) kept in captivity may suffer a variety of obstetrical mishaps, particularly dystocia.

The present account is of an abnormal pregnancy, of a type not previously reported for a non-human primate, in a marmoset. The animal was part of a colony of imported marmosets maintained at the Medical Research Council Laboratory Animals Centre, Carshalton. The pregnancy was the first for