Thanaporn PinpartApisit LaosantisukWanson KeawmaneeKanchana KengkoomMahidol University.Laboratory Animal Production, Office of Academic Services2015-03-102018-08-192015-03-102018-08-192015-03-102014https://repository.li.mahidol.ac.th/handle/20.500.14594/22842Proceedings of 52nd Kasetsart University Annual Conference: Animal, Veterinary Medicine. 4-7 Feb 2014; Bangkok : Kasetsart University p. 124-128The three inbred mice strains at Nation Laboratory Animal Center’s (NLAC) foundation colonies were looked for secondary sex ratios. The data were collected from all mating pair from the year 1999 to the year 2012. These 3 strains consist of BALB/cMlac, C57BL/6Mlac and DBA/2Mlac. Their sex ratios were 0.49, 0.50 and 0.52, respectively. Statistical analysis (binomial-test) indicated that secondary sex ratios of 3 inbred mice strains at NLAC do not deviate from the theoretical ratio. Moreover, they are consistent with other laboratories. This is the revelation of the common practice strong stabilizing selection for the intermediate sex ratio at NLAC’s foundation colonies.engMahidol University. National Laboratory Animal CenterMiceInbred strainssex ratioProceeding Book