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Coeffieient of eoaneestry: The coefficient of coancestry, half of additive genetic relationship, was used to predict future rates of inbreeding because the coefficient of coancestry of parents equals the inbreeding coefficient of progeny (Falconer and Mackay, 1996).
where, At denotes the matrix of additive genetic relationship among animals in year t; [c.sub.t] denotes the vector of genetic contribution of individuals in year t to age class 1 in year t+1 (contributions of animals not selected are 0; male or female contributions sum to 0.5); [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] denotes the average additive genetic relationship of individuals within age class 1 in year t+1 (i.e.
Inbreeding increases on average within new progenies equal half the increase of the average additive genetic relationship among selected parents (Falconer and Mackay, 1996).