Allozyme variation between laboratory reared and wild populations of Teladorsagia circumcincta.

The technique of allozyme electrophoresis was applied to two laboratory strains (isolated from the center or south-east of France) and wild populations of Teladorsagia circumcincta from the center of France. Five systems out of 13 (GPI, MPI, MDH, LDH, PGM) could be interpreted. By means of a multivariate analysis, it was shown that the laboratory strains were very similar with each other and genetically different from the wild populations. A deficiency of heterozygotes was recorded for each enzyme locus (except for MDH) in all populations studied.