Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 110934
Title Is there a future for the boar? : the role of boar stimuli in reproductive processes around estrus in the pig
Author(s) Langendijk, P.
Source University. Promotor(en): Bas Kemp; Nicoline Nieuwenhuizen-Soede. - S.l. : s.n.] - ISBN 9789058085146 - 177 p.
Department(s) Adaptation Physiology
Publication type Dissertation, internally prepared
Publication year 2001
Keyword(s) varkens - beren (varkens) - voortplanting - pigs - boars - reproduction
Categories Pigs
Abstract This thesis describes several boar stimuli in their potency to elicit estrous behavior and their potency to affect uterine contractility. With different levels of boar stimuli, onset of estrus can be recorded at different time points relative to ovulation, depending on the change in responsiveness of sows to the stimuli. However, the onset of estrus recorded in such ways, as well as the change in responsiveness recorded by using different stimuli to induce estrous behavior, appeared to be bad predictors for the time of ovulation. Time of ovulation is important for the success of insemination. The use of a back pressure test in the presence of a boar appeared to be most appropriate for detection of estrus, as with lower levels of boar stimuli the chance of not detecting estrus increases, and higher levels of stimuli did not add to the efficiency of estrus detection due to habituation. Uterine contractility is increased during estrus and is important for sperm transport, as suppression of uterine contractility reduces fertilisation rate. Stimulation of uterine contractility to a high degree on the other hand, can obstruct the uptake of the inseminate and increase the reflux of semen. Presence of a boar is more potent than 5-androstenon or tactile stimuli in inducing the release of oxytocin and in stimulating uterine contractility. Moreover, boar presence selectively stimulates uterine contractility only in sows that have a below average uterine contractility, and might therefore be an appropriate way of stimulating uterine contractility during insemination.
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