Animal Science Department


Date of this Version

January 1978


Published in J Dairy Sci1978, 61:970-973. Copyright © 1978 The American Dairy Science Association. Used by permission.


A procedure is developed to determine the relative economic values of effects of sire of cow and sire of fetus. The economic weights for selection will depend on the time and discount rate. For example, for 10 yr and a 10% discount rate, the relative economic weights are 1.240 and 1.284 for the sire's direct genetic and fetal genetic effects when the fetal effect of the sire affects only the subsequent lactation of the mate of the sire. If the fetal effect is carried over to each future lactation of the mate, the relative economic weights are 1.240 for the direct and 3.184 for the fetal sire effects.