Relations génétiques entre caractères relatifs au développement sexuel, à l’odeur de la viande, à l’état inflammatoire et à l’agressivité chez le porc mâle entier
Résumé
Breeding intact boars is a promising alternative to the surgical castration of piglets. Genetic selection should make it possible to
solve problems due to boar taint and aggressiveness. About 1600 Pietrain type (purebred) or Pietrain x Large White type
(crossbred) boars were raised in a testing station. Blood samples were collected for measuring two sex hormones (testosterone,
estradiol), and indicators of the inflammatory status (C‐reactive protein: CRP, Pig Major Acute‐Phase Protein: pigMAP, blood
formula). Animals were slaughtered nine days later, measured for boar taint compounds (androstenone, skatole) and skin lesions
on carcass, an indicator of aggressiveness. For both genetic types, heritability was moderate for sex hormones (from 0.17 to 0.29)
and skatole (purebred: 0.24, crossbred: 0.37), and high for androstenone (0.63 and 0.70). Genetic correlations between sex
hormones and boar taint compounds were moderate to high (from 0.31 to 0.95). Heritability was moderate for CRP (0.24 and 0.46)
and very low for pigMAP (0.06 and 0.05). Numbers of leucocytes had moderate to high heritabilities according to the genetic type
(0.21 and 0.52). Heritability of skin lesions was moderate for both genetic types (0.31). Genetic correlations were negative
between sex hormones and inflammatory measures (from ‐0.46 to ‐0.05), positive between testosterone and number of lesions
(0.43 and 0.53), and low between androstenone and lesions (‐0.06 and ‐0.17). Therefore, it would be possible to select boars on
their concentration in plasma sex hormones to decrease boar taint and aggressiveness, without important consequences on the
inflammatory system.
Domaines
Sciences du Vivant [q-bio]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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