 Analysis of minor allergens by immunoblot 2 D, ESPCI frozen serum3 prick tests 4 1 or 2 oral provocation test TPO double blind, during 2 days At M3 : clinical examination, side effects during the 3 preceding months At M6 :1 Clinical examination 2 Biological test blood sample 16.5 mL : WBC, ferritin, total IgE, specific IgE, cow milk, ALPHALACTALBUMIN, casein, BETALACTOGLOBULIN and goat milk using RAST Specific secretory IgA by ESPCI frozen salivaBiologic collection Specific immunoglobulins against cow milk, ALPHALACTALBUMIN, casein, BETALACTOGLOBULIN, quantification of IgM, sub classes of IgG and IgA by ESPCI frozen serum. 