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《Acta Laboratorium Animalis Scientia Sinica》 2001-01
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Laboratory Observation on Breeding and Growth and Development of Microtus fortis

LIU Zongchuan, HE Yongkang, ZHANG Xinyue, YANG Ruiqing, ZHANG Hui (Hunan Institute of Parasitic Diseases, Yueyang 414000, China)  
Objective To find out the breeding, growth and development characteristics of Microtus fortis in laboratory Methods Laboratory observations were carried out on the fourth and fifth filial generation (F 4 F 5) Results The females bred all the year with the major seasons from March to April and from October to November The breeding rate for single sex ratio mating was much higher than that for multi-sex ratio mating The pregnant period was 20-21 days The nest size was ranged from 3 to 11 with the mean size of 4 8±1 5 The weight of newborn M fortis was 2 5-4 4 g, Ear erection occurred among 3-day-old infant M fortis Hair cover was fully-grown at the age of 6-8 days Eyes opened at 7-11 days old All teeth emerged at 10-11 days old Young M fortis could feed themselves at the 15th day after birth and live completely independently at the 20th day when breast-feeding could be stopped A few of female pudenda holes could be seen at 60-70 days old, and most of female pudenda ones and apparent male tentes seen at 75-90 days old The growth of body weight and height weren't remarkable after 3 months from birth Conclusion Under the open indoor environment, the breeding season, nest size and weight of newborn of M fortis in laboratory were as that of wild M fortis The density and sex ratio of colony showed an apparent influence on breeding rate of females Most of M fortis matured completely at the second to 3rd month after birth and could make the first mating at the 3rd-4th month But there existed individual difference in maturing period, which was influenced by nutrition and environmental factors
【Fund】: 国家科技部“九五”攻关项目!(1 996-A2 3-0 6-0 4 )资助课题部分内容
【CateGory Index】: S865.1
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