[1] Ecole Natl Vet Toulouse, Dept Sci Biol & Fonctionnelles, F-31076 Toulouse 3, France
[2] Ecole Natl Vet Toulouse, URA INRA Physiopathol & Toxicol Expt, F-31076 Toulouse 3, France
[3] Inst Dev Rural, Ouagadougou, Burkina Faso
[4] Inst Agron & Vet Hassan II, Dept Pharm Toxicol & Biochim, Rabat, Morocco
[5] Ecole Natl Vet, Dept Clin Sante & Prod Anim, F-69280 Marcy Letoile, France