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A method of herd analysis developed at Jena involves the use of an insemination index derived from the total number of inseminations divided by the number of pregnancies reported. In 1959 this method was used to analyse data on 21, 228 artificially inseminated and 5903 naturally mated cows in...

Conradi, H.
Zuchthygiene, Fortpflanzungsstorungen und Besamung der Haustiere, 1961, 5, pp 50-58