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Evolutions génétiques du comportement des truies et de leurs porcelets en début de lactation et leurs associations avec la mortalité et la croissance néonatale

Abstract : Changes in animal behaviour in relation to 21 years of genetic improvement were studied. Performances between two groups (G77 and G98) of Large White sows obtained by insemination with semen from Large White boars born in 1977 or 1998 were compared. The objective was to analyse the evolution of the mother-young relationship and to understand it with regard to the evolution of mortality and growth of piglets all left with their biological mother. The two lines did not differ in litter size (11.5 vs 11.3 piglets born alive, P = 0.69) or overall mortality during the first week (12.4% vs 13.6%, P = 0.63). Video recordings were analysed to study (1) the postural activity of sows from D1 to D4, and (2) the reaction of the sow and piglets to a 20 min separation 24 hours after farrowing (D1). Competition of piglets for udder access was assessed by characterizing facial injuries at D1. From D1 to D4, sows progressively resumed activity in both lines. At D1 and D2, G98 sows spent twice as much time lying on the belly as G77 sows, which decreased access to the udder. At D4, however, they were less likely to shorten their lactation than G77 sows. At D2, G77 piglets slept more in contact with the udder than G98 piglets (P = 0.10). At D1 and D2, in comparison to G77 piglets, G98 piglets fought more with each other during lactation, resulting in more facial injuries (P < 0.10) and were more likely to suckle upon their return after separation (P = 0.013). As G98 piglets have higher nutritional requirements, they are more demanding of their mother for suckling and are more combative at the udder than G77 piglets. This may explain the evolution of the behaviour of sows, which hide their udder more frequently, and of piglets, which sleep less frequently in contact with their mother.
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https://hal.inrae.fr/hal-03135223
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Submitted on : Monday, February 8, 2021 - 6:43:31 PM
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Oceane Girardie, Chloé Espinoza, Christophe Perry, Martial Lapouméroulie, Jean Gogué, et al.. Evolutions génétiques du comportement des truies et de leurs porcelets en début de lactation et leurs associations avec la mortalité et la croissance néonatale. Journées Recherche Porcine, 2021, Paris, France. pp.19-24. ⟨hal-03135223⟩

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