The researchers wanted to see how well kampung rooster sperm stays healthy in a special liquid at a cold temperature. They mixed the sperm with different amounts of egg yolk in a solution called 5% Dextrose Ringer’s. They found that adding egg yolk helped keep the sperm moving and alive better. The more egg yolk they added, the better the sperm stayed healthy. This means that using a mix of 5% Dextrose Ringer’s solution and egg yolk can help preserve kampung rooster sperm for longer periods.