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The aims of the present study were to compare the effects of two commercial preparations (Equex STM Paste or Equex Pasta), whose active ingredient is sodium dodecyl sulphate (SDS), added to a Tris–egg yolk-based extender, on post-thaw sperm survival and longevity, as well as on the intracellular Ca 2+ concentration of dog spermatozoa during incubation at 38°C. One ejaculate was collected from...