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Recently a Mongolian gerbil has become a useful laboratory animal, while little of the basic data are known about the breeding and growth of this laboratory rodent. In our animal center, an inbred strain of the seizure prone gerbil has been produced and kept these ten years. The data on the breeding and growth of the animal were obtained and described as following in the present paper. The mean life span was 26 +/- 14 month old for males and 27 +/- 13 month old for females. The mean body weight of the Mongolian gerbils at 16 weeks of age was 72 +/- 5.6 g for males and 62 +/- 7.3 g for females. The mean litter size at birth was 4.8 +/- 1.7 head. (range; 1-9) More newborn pups were born in the warm seasons (March-October) than the cold seasons (November-February). The mean rate of weaning was 80.2%. The man litter size was relatively constant in each generation.

Breeding and Growth of the Inbred Strain of Seizure Prone Mongolian Gerbil (<I>Meriones Unguiculatus</I>)