| dc.contributor.advisor | Holtz, Wolfgang Prof. Dr. | de |
| dc.contributor.author | Lau, Holger | de |
| dc.date.accessioned | 2013-01-22T15:45:10Z | de |
| dc.date.available | 2013-01-30T23:50:58Z | de |
| dc.date.issued | 2008-04-25 | de |
| dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-000D-F152-B | de |
| dc.identifier.uri | http://dx.doi.org/10.53846/goediss-3448 | |
| dc.description.abstract | In der Arbeit werden die in der Literatur
f | de |
| dc.format.mimetype | application/pdf | de |
| dc.language.iso | ger | de |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/ | de |
| dc.title | Untersuchungen zum Einfluss verschiedener fortpflanzungssteuernder Maßnahmen auf die Fruchtbarkeitsleistung von Jung- und Altsauen unter Großbestandsbedingungen | de |
| dc.type | doctoralThesis | de |
| dc.title.translated | Investigations to the role of biotechnological interventions in the reproductive performance of gilts and sows in large swine farms | de |
| dc.contributor.referee | Gauly, Mathias Prof. Dr. Dr. | de |
| dc.date.examination | 2008-01-31 | de |
| dc.subject.dnb | 630 Landwirtschaft, Veterinärmedizin | de |
| dc.subject.gok | YFH 000 | de |
| dc.description.abstracteng | The thesis describes the literature on
biotechnological interventions in reproduction and the resulting
reproductive performance for large swine farms. The purpose of the
investigation was to analyze the role biotechnological
interventions may play in the reproductive management of large
swine farms.
In Experiment 1, the effect on an extension of the interval between
the end of Regumate treatment and the injection of eCG from 24 to
41 or 48h was investigated. No significant differences with respect
to estrous and pregnancy rates were found. There was a tendency for
litter size to be increased, though, as the interval was
increased.
The artificial insemination regime in combination with other
biotechnological measures employed on a farm was analyzed over a
period of two years. Due to a reduction of the suckling period and
a shortage in pens there arose a problem of accommodating sows that
came not in estrus or too late. To enhance efficiency, ovulation
induction was employed, but only in animals that did not exhibit
estrous symptoms within the expected period. This approach was just
as efficient as fixed time insemination of the entire herd while
reducing the required amount of costly hormones. The reproductive
performance was unaffected. In a separate investigation it was
shown that a third insemination was not advantageous. When
comparing German Landrace and hybrid sows (Large White x German
Landrace) no differences in the course of estrus were observed.
Consequently sows of these two populations may be subjected to the
same insemination regimen.
Within the scope of partially synchronization of ovulation the use
of hCG and GnRH was compared over a period of one year. Significant
differences were not found. No recommendation can be made with
regard to the use of hCG or GnRH depending on parity, breed, season
or the time of onset of estrus. Seven conclusions were drawn
concerning commercial pig production. | de |
| dc.subject.topic | Agricultural Sciences | de |
| dc.subject.ger | Sauenfruchtbarkeit | de |
| dc.subject.ger | Fortpflanzungssteuerung | de |
| dc.subject.eng | reproductive performance of sows | de |
| dc.subject.eng | biotechnological interventions | de |
| dc.subject.bk | 48.64 | de |
| dc.identifier.urn | urn:nbn:de:gbv:7-webdoc-1772-7 | de |
| dc.identifier.purl | webdoc-1772/ | de |
| dc.identifier.ppn | 591105349 | de |