54 Dairy Demonstration Work in New York State 



6. He must be present at every milking during the test and 

 see that the pail contains nothing but the milk drawn from the 

 cow under test. 



7. Only one cow shall be milked at a time, and the dairy 

 demonstration agent must in every case be in position to observe 

 the milker during the whole milking. 



Immediately after the milk is drawn at each milking he 

 shall take charge of the pail and contents, weigh the same on 

 approved scales, and enter the exact weight of the milk at once 

 on his records. 



8. An extra pail shall be provided by the owner, and the milk 

 shall be poured from one pail to another until throughly mixed. 

 The dairy demonstration agent shall then take samples of the milk 

 sufficient for his test and for the composite sample. 



The samples of milk shall be kept under lock and key, or in 

 sight of the dairy demonstration agent, until tested. 



The fat determinations shall always be made in duplicate, 

 using properly calibrated glassware, and both determinations 

 recorded. The average must be used in computing the amount of 

 fat. The samples taken at any one milking shall not be thrown 

 away until satisfactory duplicate tests of the milking are obtained. 



Readings of the tests shall be made at a temperature of 130° 

 to 140° F. If the duplicate determinations vary more than .2 

 per cent, the test must be repeated. 



9. A composite sample for each cow, correctly made and pre^ 

 served, shall be forwarded to the nearest state school of agriculture 

 immediately upon completion of the test. In case of a two-day 

 test, this composite sample shall contain 3 c.c. of milk for each 

 pound of the milk produced during the test. Suitable containers 

 for such composite samples shall be furnished by the owner of the 

 cow on test. 



10. The production of butter fat for the month shall be deter- 

 mined by multiplying the total milk production for the month by 

 the average test of the milk on the day of the inspection. This 

 average test is determined by dividing the total production of fat 

 on the day of test by the total production of milk. 



11. The dairy demonstration agent shall report to the director 

 of farmers' institutes through the farm bureau manager in the 

 county any obvious violation of the rules. 



