Mise en évidence des effets du génotype, de l’agressivité et de l’hygiène sur la teneur en composes odorants du gras dorsal de la viande de porc male entier

Abstract : Boar taint, due to the accumulation of androstenone and skatole in the fat tissue, is the major constraint to the production of entire male pigs. Androstenone is produced by the testes. Its synthesis increases during pubertal development. Skatole is produced in the hind gut. Its hepatic catabolism is inhibited by sexual steroids. Apart from genetics and feeding, the factors affecting boar taint have been little studied.The current thesis approaches four aspects of the boar taint problem: 1) the heritability of the fat content of odorous compounds in the fat tissue and their genetic correlations with indicators of health, sexual development and aggressiveness; 2) to study the effect of dominance on the fat content of boar taint compounds; 3) to determine the influence of a moderate chronic inflammatory status on the sexual development and the fat concentration in androstenone; 4) to evaluate the effect of contrasting hygiene conditions on the fat concentration in skatole and, to analyOur results confirm the high heritability of the fat concentrations of boar taint compounds but their genetic correlations with health indicators are low. A selection to decrease the plasma concentrations in estradiol and testosterone should decrease both boar taint compound concentrations and aggressiveness of boars. Boars with a high dominance rank have a higher fat concentration in androstenone. Lastly, the degradation of the housing hygiene conditions strongly increases the concentration in skatole, probably through modifications in gut microbiota composition
Complete list of metadatas

Cited literature [320 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01643220
Contributor : Abes Star <>
Submitted on : Tuesday, November 21, 2017 - 11:17:30 AM
Last modification on : Tuesday, September 25, 2018 - 1:03:58 AM

File

pdfa_2tGMpgz1_parois.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01643220, version 1

Collections

Citation

Séverine Parois. Mise en évidence des effets du génotype, de l’agressivité et de l’hygiène sur la teneur en composes odorants du gras dorsal de la viande de porc male entier. Science des productions animales. Agrocampus Ouest, 2016. Français. ⟨NNT : 2016NSARB290⟩. ⟨tel-01643220⟩

Share

Metrics

Record views

442

Files downloads

163