Cooling is not a mandatory action to be successful with your breeders however there are risks. Some of the literature says cooling does help with follicle growth and maturation. Some breeders believe cooling is a necessary part to effectively condition breeders adequately. I am on the fence with it but it does make sense. I am afraid of the risks that's why I haven't implemented it in my collection yet.
What are the risks you mentioned? I have yet to hear there are risks
1.0 pewter bee
1.0 banana het pied
0.1 pied
1.1 mahogany
0.1 golden retriever