Untersuchungen zum Einfluss verschiedener fortpflanzungssteuernder Maßnahmen auf die Fruchtbarkeitsleistung von Jung- und Altsauen unter Großbestandsbedingungen

Investigations to the role of biotechnological interventions in the reproductive performance of gilts and sows in large swine farms

by Holger Lau
Doctoral thesis
Date of Examination:2008-01-31
Date of issue:2008-04-25
Advisor:Prof. Dr. Wolfgang Holtz
Referee:Prof. Dr. Dr. Mathias Gauly
Persistent Address: http://dx.doi.org/10.53846/goediss-3448

 

 

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Abstract

English

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.
Keywords: reproductive performance of sows; biotechnological interventions

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Schlagwörter: Sauenfruchtbarkeit; Fortpflanzungssteuerung
 
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