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Summary. The effect of a synthetic, irreversible trypsin inhibitor (TLCK: tosyl-l-lysine chloromethyl ketone) upon the fertilizing capacity of spermatozoa from four individual cocks was evaluated. Recently ejaculated spermatozoa were incubated with TLCK for 20 min at 37\s=deg\C before insemination. The inhibitor was used at two concentrations that did not affect sperm motility. The mean fertility for the unincubated control, non-TLCK-incubated control and 50 \g=m\g TLCK-incubated semen groups was 91\m=.\8,85\m=.\4and 51\m=.\9%,respectively. Using 75 \g=m\gTLCK, the mean fertility for the unincubated control, incubated control and treated semen groups was 93\m=.\1,74\m=.\1and 24\m=.\4%, respectively. These results demonstrate the effectiveness of a synthetic trypsin inhibitor in successfully reducing fertilization in vivo and thus suggest the need for an active acrosomal trypsin-like enzyme for fertili- zation of the hen's ovum.

THE REQUIREMENT OF A TRYPSIN-LIKE ACROSOMAL ENZYME FOR FERTILIZATION IN THE DOMESTIC FOWL