English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

One of the conditions of high efficiency in pig production is successful reproduction. The use of high meatiness gilts and sows in mass breeding often causes a lack of or low intensity of typical sexual behaviour in heat which has a negative influence on the reproduction rate (7). Mating behaviour in pigs is observed for a short period of time and occurs at the moment of contact of a boar and a sow in heat. The sow plays a prominent role, sending signals toward the boar. During mating the boar sniffs the sow, directs his nose at her body, moves its snout along the sides and close to the vulva, producing a series of throaty grunts being a component part of courtship. The increasing tactile stimulation of the sow also heightens the sexual arousal of the boar (4). The moment at which the sow exhibits full tolerance to the boar (the so called lordosis reflex) shows the peak of the heat period and the optimal time for mating or insemination. The appropriate identification of oestrus symptoms in sows is hindered by the so called ‘silent heats’. Their occurrence is initiated, among other things, by stress stimuli which may provoke masking of sexual behaviours (1, 2, 7). Current research indicates that the intensity of sexual behaviour (8) as well as the age at which females show external manifestations of sexual activity (9) is conditioned genetically. Identifying the association Sexual activity of different gilt genotype groups of the Pulawska breed during oestrus