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Abstract

From 1977 to 1984, the number of inseminations carried out in the German Democratic Republic decreased from 2 724 900 to 2 615 500, while the 90- to 120-day NR rate increased from 52.1 to 57.1%. Over the same period, the av. age at 1st insemination increased from 558 to 638 days, av. age at 1st...

Author(s)
Peter, W.; Jenichen, W.
Citation
Monatshefte für Veterinärmedizin, 1986, 41, 6, pp 181-185
Abstract

In 1980 in the German Democratic Republic, the interval to 1st postpartum oestrus averaged 61 days, the service period 91 days, the CR to 1st insemination 53.3%, age at 1st insemination 595 days, and age at 1st conception 615 days. In 14 provinces, the CR ranged from 48.7 to 58.9%. Current research ...

Author(s)
Pilz, J.; Peter, W.; Jenichen, W.
Citation
Monatshefte fur Veterinarmedizin, 1982, 37, 23, pp 894-896
Abstract

The N.R. rate to 13, 076 inseminations with 295 ejaculates obtained at different intervals from 5 groups each of 4 bulls was investigated; for a single ejaculate it was 60.6% at a 3-day interval, 67.5% at a 6-day interval, 64.6% at an interval of more than 6 days and 65.0% at irregular intervals;...

Author(s)
Jenichen, W.; Baum, W.
Citation
Zuchthygiene, Fortpflanzungsstorungen und Besamung der Haustiere, 1962, 6, pp 134-145
Abstract

This book contains a considerable amount of detailed and useful information and gives a good insight into the organization of the A.I. service in East Germany. Written in very readable language, it is well produced and is amply illustrated with moderately good illustrations and many graphs and...

Author(s)
Jenichen, W.; Strassburg, H.; Zelfel, S.
Publisher
Berlin: VEB Deutscher Landwirtschaftsverlag.,
Citation
Samenubertragung beim Rind., 1962, pp 440 pp.
Abstract

Various methods of calculating conception rates following A.I., involving pregnancy diagnosis by clinical methods, the non-return method and the "herd analysis" method [see A. B. A., 27, No. 1344], are compared, using data from the Hanichen A.I. Station for the years 1954-58.

Author(s)
Jenichen, W.; Schafer, W.; Dex-heimer, J.
Citation
Tierzucht, 1961, 15, pp 13-16; 54-56
Abstract

An account is given of the work at A. I. stations in the German Democratic Republic. In the first 6 mths. of 1960 about 72% of the cow population was inseminated, a total of 1, 031, 374 first inseminations being carried out; this was an increase of 20. 8% over the previous year. Recent non-return...

Author(s)
Herrmann, G.; Jenichen, W.; Zel-fel, S.
Citation
Tierzucht, 1960, 14, pp 438-445
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