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The paucity of information and the unagreed consensus about the estrous cycle of the Mongolian gerbil (Meriones unguiculatus) have rendered such studies rather difficult. The estrous cycle of the Mongolian gerbils in this report were divided into 5 stages: Stage I, proestrus; Stage II, estrus (scattering); Stage III, estrus (gathering); Stage IV, metestrus and Stage V, diestrus. The normal estrous cycle in the Mongolian gerbils was 4-6 days long. In our experimental conditions, 67.9% of virgin females had a 4-6 day cycle, whereas 26.4% had an unsettled cycle and 5.7% assumed pseudopregnancy. The changing pattern of the estrous cycle and copulatory behavior of the Mongolian gerbils after hormone (PMSG: pregnant mare serum gonadotropin, 10 IU; hCG: human chorionic gonadotropin, 10 IU) injection were examined. The change in the estrous stage after hormone injection could be roughly classified into two types. The vaginal smear of virgin females injected with PMSG at Stage I, II or III changed to Stage V the next day and to Stage I or Stage II after 48 hr, but in the case of Stage IV or V, the smear changed to Stage I after 48 hr. The females injected with PMSG at Stage I, II or III copulated at from 13:00 to 23:00, whereas others injected at Stage IV or V scarcely copulated at all between 13:00 and 23:00. Mating of these females with the male midnight was not observed.
Behavior. --- Copulatory-behavior. --- Estrous cycle. --- Estrous-cycle. --- Estrus. --- Female. --- Females. --- Gerbil. --- Gerbils. --- Hormone. --- Human. --- Male. --- Mare. --- Mating. --- Meriones unguiculatus. --- Meriones-unguiculatus. --- Mongolian gerbil. --- Mongolian gerbils. --- Mongolian-gerbil. --- Pattern. --- Pseudopregnancy. --- Serum. --- Unguiculatus.
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In rats, pseudopregnancy has been induced by mating with vasectomized males, by mechanical stimulation of the uterine cervix with a glass rod or vibrator, and by stimulation of the vagina with a tampon. On the other hand, no practical data are available in reports on the induction of pseudopregnancy in Mongolian gerbils. Pseudopregnancy of gerbils has been induced by mating with vasectomized males. But this method was uncertain because the incidence of pseudopregnancy was lower than that obtained in rats by other means. In the present study, two experiments were undertaken as follows. 1) Copulatory behavior of gerbils was observed for one hour to determine the most effective stimulation interval. 2) From the results of Experiment 1, female gerbils in estrus were mechanically stimulated to test the effectiveness of inducing pseudopregnancy by vaginal stimulation at various time intervals. The results of these experiments indicated that, although the frequency of copulatory behavior varied among individuals, on average the most effective method for inducing pseudopregnancy was stimulation of 5 min duration and at 20 or 30 min intervals. Because the incidence of pseudopregnancy induced by such mechanical stimulation (83.3%) was higher than that induced by mating with vasectomized males (30.0%), this method might be useful in inducing pseudopregnancy in Mongolian gerbils.
Behavior. --- Copulatory-behavior. --- Duration. --- Estrus. --- Experiment. --- Experiments. --- Female. --- Frequency. --- Gerbil. --- Gerbils. --- Induction. --- Male. --- Males. --- Mating. --- Meriones unguiculatus. --- Meriones-unguiculatus. --- Method. --- Mongolian gerbil. --- Mongolian gerbils. --- Mongolian-gerbil. --- Pseudopregnancy. --- Rat. --- Rats. --- Stimulation. --- Test. --- Time. --- Unguiculatus.
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