Predicting the fertilising ability of avian semen: Comparison of a simple colourimetric test with other methods for predicting the fertilising ability of fowl semen

The rate of tetrazolium dye-reduction by fowl spermatozoa measured by an objective colourimetric assay was shown to correlate strongly with sperm motility, morphology, ATP content and fertilising ability. 2. Although dye-reduction appeared less well correlated with fertilising ability than the other variables, the method for its determination has many practical advantages for the assessment of semen quality in poultry.