Fig. 3From: Effects of vitamin D supplementation in extender on sperm kinematics and apoptosis following the freeze-thaw process in normozoospermic and asthenozoospermic Holstein bullsEffect of supplementing semen extender with vitamin D on reactive oxygen species (ROS, %) in post-thawed sperm normozoospermic and asthenozoospermic Holstein bulls. * Mean in columns without different superscripts are not significantly differ (P > 0.05)Back to article page