[Study on the estimation theory of genetic parameters--the estimation method when the parents were relative]

By decomposing the expected mean squares in variance analysis, the estimation methods of genetic parameters are suggested in sib analysis when the parents of the sibs are relatives. Two estimation examples are also given. The results indicate that the estimation values are greater than those estimated by supposing that the parents are not relatives. The closer relative the parents are, the bigger the biased would be. The computer programme PARESTH and PARESTF made it easy to apply the methods. Furthermore, the methods can also be used in variance analysis when the relationships between the levels of each factors are determined.