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The estimations of the inbreeding coefficient and of the probability of origin of genes are usually based upon genealogical information and are therefore sensitive to various errors such as misassignment of paternity or maternity, faults in documents or records, and fields errors. By using different examples of errors in the pedigree, it is demonstrated that the bias in the inbreeding coefficient can be very large, while the probability of origin of genes is less affected. If no accurate estimate of the different errors can be obtained, the comparisons of inbreeding coefficients calculated for different populations or generations are very suspect.