Abstract
When a new animal is found that would be useful as a subject in biological experimentation, attempts must be made to develop a consistently reproducing laboratory colony. If the colony is to be successful, information must be obtained concerning its habits and reproductive cycle. | A. The Monogolian Gerbil. The Mongolian gerbil (Meriones unguiculatus, Order Rodentia, Family Cricetldae, Subfamily Gerblllinae) was introduced to the United States in 1963 by Dr. Victor Schwentker of the West Foundation (Schwentker, 1963). Although the animal is new to the field of biological research, it has been used with increasing frequency during the recent years in a variety of experimental work. The animal has been useful in the study of cholesterol metabolism (Gordon, 1959; 1961). Its metabolic characteristics as a desert rodent have been reported by Robinson (1959). Kramer (1960 has given an account of linear measurements and organ-weight determinations. Benitz (1965) has published a description of spontaneous tumors. Ruhren (1965) and Dellenback (1965) have reported on the hematology in various age groups.