Exteroceptive factors and pregnancy block in the Mongolian gerbil, Meriones unguiculatus

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Abstract
A series of experiments based on 150 newly mated, uni- and multi-parous Mongolian gerbils provided no evidence for the existence of pregnancy blocking due to a strange male effect. The reduced fertility level observed was attributed to stressful factors at critical times in the pregnancy. Treatment with 10 IU pregnant mare''s serum gonadotropin on the day following mating interrupted pregnancy and the majority of females mated again within 4 days.