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Abstract

In order to increase fertility in modern dairy farming, the interval between first insemination and conception should be as short as possible. Therefore, one approach is to diagnose non pregnant animals early to re-inseminate them as soon as possible. Commercial milk pregnancy assays are available...

Author(s)
Engelke, J.; Feldmann, M.; Gundling, N.; Gundelach, Y.; Egli, C.; Hoedemaker, M.; Piechotta, M.
Publisher
Schlütersche Verlagsgesellschaft GmbH & Co. KG, Hannover, Germany
Citation
Berliner und Münchener Tierärztliche Wochenschrift, 2015, 128, 9/10, pp 402-408
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

This thesis comprises 2 sections, each complete within itself. Detailed physical and physiological observations were made at the National Sahiwal Stud in Kenya. The structure and organization of the stud is described. Of 152 bulls, 65 were purebred Sahiwals, and the rest were crossbreds with the...

Author(s)
GROVE, D.
Publisher
Hanover,
Citation
Thesis, Ludwig-Maximilians-Universitat, Munchen, 1968, pp 78 pp.
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

A general survey of A. I. throughout the world is given by Professor T. Bonadonna. The consequence of the increasing use of A. I. in Western Germany and its effect in particular on pedigree breeders is discussed by Dr R. Winnig-stedt. The work of two bull progeny-testing centres in South Germany is ...

Citation
Arb. ArbGemeinsch. dtsch. Rinderzuchter, 1957, 21, pp 79 pp.
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

Although this book was published in 1949 the text was prepared a few years before and the preface is dated "1947". An extensive list of references covers the period up to 1946.
This is not intended as a textbook but rather as a guide and stimulus to further investigation and as such it naturally...

Author(s)
GÖTZE, R.
Publisher
Hannover: M. & H. Schaper.,
Citation
Besamung und Unfrucht barkeit der Haussaugetiere., 1949, pp xii + 613 pp.
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
Abstract

The conception rate obtained in maiden heifers artificially inseminated is as high, or even higher, than that obtained in adult cows, provided the operator is sufficiently trained and skilled. Following first insemination the average conception rate obtained (as ascertained by rectal diagnosis) was ...

Author(s)
BONADONNA, T.
Citation
Wiener Tierarztliche Monatsschrift, 1950, 37, pp 513-515
Abstract

BETWEEN Feb. and Dec. 1946, 700 cows were artificially inseminated at Lindau A. I. centre in the Eckernförde district [of Schleswig]. Of the 628 cows which were " fully treated " 80. 5% became pregnant. An average of 1. 6 inseminations per pregnancy was required (14 inseminations, exclucling cows...

Author(s)
HOELZER, H.
Citation
Deutsche Tierarztliche Wochenschrift, 1947, 54, pp 293-295

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