Sperm from bulls need to go through a process called capacitation before they can fertilize an egg. This process is influenced by fluids from both the male and female reproductive tracts. Scientists found that when bull sperm were exposed to heparin or oviductal fluid, their ability to bind to the egg's outer layer increased. Additionally, when sperm from the cauda epididymidis were treated with fluid from the accessory sex glands, their binding ability also improved. This increased binding ability helps the sperm attach to the egg properly, which is important for fertilization to occur.