Abstract
A go/no-go operant task was used to assess the ability of male Long-Evans rats to discriminate between the urine odors from pairs of intact MHC congenic mice (C57BL/6-H-2Kb/J and C57BL/6-H-2Kbm1/ByJ), intact Y congenic mice (DBA1 and DBA1.C57BL10-Y), and castrated Y congenic mice of these two strains. The MHC congenic strains differ in alleles of the H-2 K locus, while the Y congenic strains differ in the nonrecombining part of the Y chromosome. Analysis of the number of correct responses to a criterion of 85% correct on each block of 20 trials revealed that the ability of the subjects to discriminate between urine odors did not differ whether samples were from pairs of intact MHC congenic mice, intact Y congenic mice, or castrated Y congenic mice. These findings are consistent with the hypothesis that individually unique urine odors may be influenced both by genes in the nonrecombining part of the Y chromosome and by genes in the major histocompatibility complex of chromosome 17. These odors are not androgen dependent. Such urinary chemical signals may be involved in pregnancy block (the Bruce effect), aggression, and other mouse social behaviors.
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Schellinck, H.M., Monahan, E., Brown, R.E. et al. A comparison of the contribution of the major histocompatibility complex (MHC) and Y chromosomes to the discriminability of individual urine odors of mice by Long-Evans rats. Behav Genet 23, 257–263 (1993). https://doi.org/10.1007/BF01082464
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DOI: https://doi.org/10.1007/BF01082464