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Abstract

The effect was investigated of mixing semen from 8 Black Pied bulls on spermatozoal survival in vitro, conception rate, pregnancy duration and calf weights. Mixing semen generally had a slight positive effect on spermatozoal survival in vitro. However, there was no significant difference in...

Author(s)
ZELFEL, S.; GOTTSCHALK, I.
Citation
Zuchthygiene, Fortpflanzungsstorungen und Besamung der Haustiere, 1962, 6, pp 42-53
Abstract

The enormous expansion of A. I. in recent years in the German Democratic Republic (1, 446, 483 first inseminations in 1958) has made pregnancy diagnosis by veterinarians impossible. A method of assessing A. I. results other than the non-return method is proposed, called " herd analysis ". This...

Author(s)
JENICHEN, W.; ZELFEL, S.
Citation
Tierzucht, 1959, 13, pp 158-163