Dry powder of the leaves of Azadirachta indica at the dose level of 20
mg, 40 mg and 60 mg/rat/day for 24 days results in a decrease in the
weight of seminal vesicle and ventral prostate, a decrease in the sper
m count, sperm motility and relative percentage of normal sperm and an
increase in the forward velocity of the sperm. The observations sugge
st that the leaves of A. indica are deleterious to the fertilizing abi
lity of the sperm.