In the branches concerning exclusively agricultural activities mentioned in 1° to 4° of article L. 722-1 and in 2° of article L. 722-20 of the rural and maritime fishing code, the threshold set in 3° of article L. 2122-5 of this code is assessed with regard to the votes cast in the elections of members representing employees in agricultural production to the departmental chambers of agriculture mentioned in article L. 511-7 of the rural and maritime fishing code.