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A 50% chance of being grey does not mean a stallion will produce 50 greys and 50 bay or chestnut foals. It means that each foal is a coin flip. There could be 80 greys out of 100, or 80 bays or chestnuts. If the grey gene is passed along, the foal is grey. If it isn't, it is not grey. The grey gene carrier does not have an elf sitting on it's shoulder with a cell phone on a calculator program telling the foal yep, you can turn grey. No. You are dkbbr today, the last mare is having the grey today.