37. (1) Before transferring any milk from a conventional bulk tank to a tank-truck or transferring any milk to a means described in clause 36 (1) (b), a bulk tank milk grader shall, (a)  examine the milk in the bulk tank to determine if it must be rejected under subsection 51 (1); and (b)  in the case of cow’s milk, take the temperature of the milk in accordance with subsection (1.0.1) to determine if it must be rejected under subsection 51 (4). O. Reg. 901/21, s. 11 (1); O. Reg. 152/23, s. 3 (1). (1.0.0.1) Before leaving a producer’s premises with milk transferred from a vertical bulk tank or before completing the transfer of milk by a means described in clause 36 (1) (b) from a vertical bulk tank, a bulk tank milk grader shall, (a)  examine the milk to determine if it must be rejected under subsection 51 (1); and (b)  in the case of cow’s milk, take the temperature of the milk in accordance with subsection (1.0.1) to determine if it must be rejected under subsection 51 (4). O. Reg. 901/21, s. 11 (1); O. Reg. 152/23, s. 3 (2). (1.0.1) A bulk tank milk grader shall take the temperature of cow’s milk in accordance with the following procedures: 1.  The temperature of the milk shall not be taken until the agitator has been in operation for at least two minutes or such longer period of time as is necessary for the milk to be thoroughly mixed. 2.  The temperature shall be taken a first time, i.  by reading the temperature displayed on the time temperature recorder for the bulk tank described in section 34.1, or ii.  if the time temperature recorder for the bulk tank has not displayed the temperature at the time the milk is picked up from the bulk tank, with an accurate hand thermometer with a stainless steel stem supplied by the bulk tank milk grader. 3.  If the temperature taken under paragraph 2 is higher than 10˚C, the temperature shall be taken a second time with an accurate hand thermometer described in subparagraph 2 ii. O. Reg. 272/12, s. 1 (1). (1.0.2) If, after examining milk or taking the temperature of the milk under subsection (1) or (1.0.0.1), the bulk tank milk grader determines that the milk must be rejected in accordance with subsection 51 (1) or (4), he or she shall refuse to transfer the milk or, if the transfer has already begun, cease to transfer the milk, and shall, (a)  attach to the tank a rejection tag showing the reason for the rejection; (b)  attempt to notify the producer; and (c)  notify the marketing officer of the marketing board as soon as possible. O. Reg. 272/12, s. 1 (1); O. Reg. 901/21, s. 11 (2). (1.0.3) For greater certainty, a bulk tank milk grader may determine that milk must be rejected in accordance with subsection 51 (1) as a result of observations that he or she makes during or after the transfer of milk and, if such a determination is made, subsection (1.0.2) applies. O. Reg. 272/12, s. 1 (1); O. Reg. 901/21, s. 11 (3). (1.1) Where there are two farm bulk tanks for cow’s milk in a milk house, and a bulk tank milk grader rejects milk in a tank under subsection (1.0.2), the bulk tank milk grader shall add a harmless food colouring to the tank containing the rejected milk. O. Reg. 392/99, s. 8; O. Reg. 272/12, s. 1 (2); O. Reg. 901/21, s. 11 (4); O. Reg. 152/23, s. 3 (3). (2) Where a producer receives a rejection tag, the marketing board may apply to the operator of a plant for acceptance of the milk for which the rejection tag was issued. O. Reg. 348/95, s. 5 (2). (3) Where the bulk tank milk grader rejects milk in a farm bulk tank under subsection (1.0.2), the producer shall not market the milk unless authorized to do so by the marketing board. O. Reg. 348/95, s. 5 (2); O. Reg. 272/12, s. 1 (3). (4) Revoked: O. Reg. 302/04, s. 2 (2).