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Hofmann (1935) submitted a proposal, using a timed mating and farrowing system to program the reproductive dates in a sow herd and thus to direct the breeding and production cycle taut. In 1958 to 1964, the developed system of periodic farrowing was operated in Thuringia first farms successfully...

Hühn, U.; Wähner, M.
Eugen Ulmer KG, Stuttgart, Germany
Züchtungskunde, 2016, 88, 4, pp 268-281