The differences in protein and enzymatic profiles of infective larvae (L3) of Trichostrongylus colubriformis, both induced and non-induced to hypobiosis, have been evaluated by means of SDS-PAGE and densitometric analysis as well as by semiquantitative micromethod API-ZYM (Bio-Mérieux, France). Quantitative differences were identified in protein levels between the induced and non-induced larvae, where the amount of two polypeptides (200–220 kDa) decreased in range 32.3–35.4 % and the amount of six polypeptides (20–28 kDa) increased in range 20.0–27.0 % in the samples of induced larvae. In contrast to non-induced larvae, on gelatin-substrate gel in L3
in vitro released (IVR) proteases from larvae conditioned to hypobiosis, zones of proteolysis were observed between 21 and 34 kDa.
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