To make full use of repeated records of relatives is very important to estimate breeding  value more accurately , especially in China . This paper induces a set of absorbing equations , with which the repeated records of many relatives of breeding animals may be absorbed in the records of themselves , instead of establishing one genetic effect equation and one maternal effect equation for each dam ,.so that can greatly decrease the orders of matrix , and to estimate breeding value with BLUP more accurately can fulfil with a mini computer. 

S. Y Liu, Z. L Sheng

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 427–432, 1986
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