21—68.5 (190,192,194) Milk tests. The department recognizes approved methods of testing milk or cream for milk fat and other dairy products as specified in Standard Methods for the Examination of Dairy Products (16th Edition). That publication is hereby incorporated into this rule by this reference and made part thereof insofar as applicable, a copy of which is on file with the department.
All milk, graded or tested, as provided by Iowa Code chapters 192 and 194 shall be graded and tested by samples which shall be taken in the following manner:
	  1. 	 Samples may only be taken from vats or tanks which pass the required organoleptic test.
	  2. 	 The temperature of milk in bulk tanks from which the sample is to be taken must not be higher than 45 degrees Fahrenheit for Grade A milk and 50 degrees Fahrenheit for manufacturing milk.
	  3. 	 The temperature of the milk in the bulk tank shall be recorded on the farm milk room record, on the collection record, and on the sample container.
	  4. 	 The volume of the milk in the bulk tank shall then be measured and the measurement shall be recorded.
	  5. 	 Bulk tanks of less than 1,000-gallon size shall be agitated for a period of not less than five minutes. Bulk tanks of 1,000 gallons or greater shall be agitated for a period of not less than ten minutes. However, if the manufacturer of the bulk tank provides in writing that a lesser time for agitation is acceptable given the design of the bulk tank, then the lesser time is acceptable if the agitation is done in a manner and time consistent with the manufacturer’s written instructions. In addition, the instructions must be conspicuously posted in the milk room. The instructions shall be laminated, framed under glass, or otherwise displayed so that the instructions will not deteriorate while displayed in the milk room.
	  6. 	 The sample shall then be taken by using an approved sterile dipper and the milk shall be poured in an approved sterile sample container, until the sample container is three-quarters full.
	  7. 	 The sample of milk shall then be immediately stored at a temperature of between 32 and 40 degrees Fahrenheit.
	  8. 	 Grade A and Grade B milk shall not be picked up from a farm bulk milk tank when the milk volume in the tank is insufficient to completely submerge the bulk milk agitator paddle or, if there is more than one set of paddles, the lower set of agitator paddles into the milk.
	  9. 	 No device, other than the bulk tank agitator, shall be used to agitate the milk in a farm bulk milk tank.
	  10. 	 If the milk in a farm bulk milk tank cannot be properly agitated by the bulk tank agitator at the time of pickup by the milk hauler, the milk shall not be sold for human consumption.
This rule is intended to implement Iowa Code sections 194.4, 194.5, and 194.6.