What is the male cocktail roll in the eggs?

The term "male cocktail roll" is likely a misunderstanding or a miscommunication. If you're referring to the role of males in the production of eggs in a biological context, male animals typically contribute sperm for fertilization. In many species, males may also play roles in courtship, territory defense, or parental care, depending on the species' reproductive strategies. If you meant something else, please provide more context for clarification.