In vitro effects of lead (Pb) on ram (Ovis aries) spermatozoa were studied to establish a threshold level that affects sperm function. Spermatozoa were incubated between 15 and 180 min with Pb concentrations ranging from 0 to 5,000 ng/mL. Sperm motility, acrosome integrity, membrane functionality and sperm viability were all negatively affected by Pb and incubation time. Acrosome integrity was linearly affected by Pb levels at an incubation time of 30 min, and 50 ng/mL was the lowest Pb level producing such effect. These experimental conditions can be appropriate for in vitro studies of the mechanisms of action of Pb on spermatozoa.
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