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Abstract

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...

Author(s)
Hühn, U.; Wähner, M.
Publisher
Eugen Ulmer KG, Stuttgart, Germany
Citation
Züchtungskunde, 2016, 88, 4, pp 268-281
Abstract

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...

Author(s)
CONRADI, H.
Citation
Zuchthygiene, Fortpflanzungsstorungen und Besamung der Haustiere, 1961, 5, pp 50-58
Abstract

P. made a statistical survey of 644 herds of cattle to assess the importance of V. fetus infection in bulls in causing abortion and infertility in cows. V. fetus was isolated from preputial washings and the seminal fluid of young bulls not yet used for breeding, and also of older bulls used with...

Author(s)
PRÖGER, K.
Citation
Monatshefte fur Veterinarmedizin, 1956, 11, pp 197-202; 224-226