Selection of sires is mainly based on fat yield in the FRG.  With raising production level and high usage of proved bulls, reliable sire proofs for so called secondary traits such as female fertility become necessary.

J. Claus, E. Kalm, B. Drees

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 206–211, 1982
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