What is COI?
Technically, the COI is the probability that both genes of a pair in a dog are identical. Simply put, it’s a measurement of inbreeding. It is calculated by a mathematical formula that is somewhat complicated to many users. The function is… COI = sum[ (.5 ^ (a + b + 1)) * (1 + c) ] a = Generations between sire and common ancestor b = Generations between dam and common ancestor c = COI of common ancestor If a common ancestor does not show up on both the top and bottom sides of a pedigree, it will not impact the COI of the dog. Using this principle, you may breed a highly inbred bitch to a highly inbred dog and end up with hybrid offspring that do not have any inbreeding whatsoever. If you don’t understand that formula, don’t worry, it’s not necessary to know how to calculate it. The COI for all dogs will be in the dog info pages and displayed on hypothetical breedings before they are confirmed. More information can can be found HERE.
