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Abstract

A review of the use of oestrus synchronization and induction, and of fixed-time artificial insemination, to permit farrowing at given intervals. Most of the work reported originated in the German Democratic Republic.

Author(s)
Heidler, W.
Citation
Wissenschaftliche Zeitschrift der Wilhelm-Pieck-Universität Rostock, Naturwissenschaftliche Reihe, 1983, 32, 8, pp 46-53
Abstract

Three experiments were carried out involving 393 prepubertal gilts. Females were injected with 500 IU PMSG plus 250 IU HCG at 210 (experiments 1 and 2) or 180 (experiment 3) days of age to induce sexual maturity. In the 1st experiment, 21, 39 and 38 females were injected with 750 IU PMSG plus 500...

Author(s)
Heidler, W.
Citation
Wissenschaftliche Zeitschrift der Wilhelm-Pieck-Universitat Rostock, Naturwissenschaftliche Reihe, 1982, 31, 1, pp 43-48
Abstract

The aim of the experiment was to determine the effect of sow age at 1st insemination on her subsequent performance, and the phenotypic correlations of reproductive traits within and between parities. The "biotechnical conditions" were oestrus synchronisation and AI. At 4 commercial breeding units,...

Author(s)
Heidler, W.; Huhn, U.
Citation
Archiv für Tierzucht, 1978, 21, 5, pp 359-370
Abstract

Sexual maturity was induced in 560 prepuberal sows by hormone treatment at 190 days of age. 352 of the females were synchronised for oestrus and were inseminated once 30, 35 or 40 h after the onset of oestrus (at 258-259 days of age), and the litter size was compared with that of females...

Author(s)
Heidler, W.; Reinhardt, L.; Nowak, P.; Huhn, U.
Citation
Wissenschaftliche Zeitschrift der Universitat Rostock, Mathematisch-Naturwissenschaftliche Reihe, 1977, 26, 1, pp 91-101
Abstract

54 gilts aged 6 mth were injected intramuscularly with 400 IU PMSG plus 200 IU HCG, and the 51 females exhibiting oestrus within 10 days of treatment were inseminated. Of the treated gilts, 36.0% conceived and 16.7% farrowed; litter size averaged 7.1, of which an average 6.8 were live-born. When 34 ...

Author(s)
Huhn, U.; Heidler, W.; Ressin, E.
Citation
Archiv für Tierzucht, 1975, 18, 5, pp 311-319
Abstract

In the 1st of 2 experiments, 22, 22 and 15 gilts (groups 1, 2 and 3 resp.) aged 180, 195 and 210 days were each injected intramuscularly with 500 IU PMS + 250 IU HCG. Females in groups 1 and 2 showed the first signs of oestrus on day 2 after treatment, while females in group 3 did not show any...

Author(s)
Heidler, W.; Huhn, U.; Ressin, E.
Citation
Archiv für Tierzucht, 1975, 18, 4, pp 205-214