13.—(1) Subject to paragraph (3) below, no person shall slaughter, or cause to be slaughtered, in any slaughterhouse any bird or rabbit intended for sale for human consumption unless he has notified, in accordance with paragraph (2) below, the food authority within whose area the place of slaughter is situated of the day and time on, and of the place at, which the slaughter will take place.
(2) The notification referred to in paragraph (1) above shall be given to the food authority not less than 72 hours before the time of such slaughter except where the food authority has agreed with the person required to give such notice that it will accept notice of a shorter duration, in which case such person shall give to that food authority notice of such agreed duration.
(3) Where it is the regular practice in any slaughterhouse to slaughter birds or rabbits at fixed times on fixed days and written notice of this practice has been given to and accepted by the food authority this shall, as respects any birds or rabbits slaughtered in accordance with such practice, be regarded as adequate compliance with the requirements in paragraphs (1) and (2) above.