Composite Samples of Milk. 163 



true average test of the morning and night milkiugs of these 

 twenty-one cows, as found by weighing and testing separately 

 the milk of each cow at both milkings. 



199. The total milk was strained into a large can at the farm, 

 both in the morning and in the evening, A sample of the 

 mixed milk was in each case taken with a long-handled dipper 

 as soon as the milkiugs were finished. When the cans of milk 

 were delivered at the creamery, a sample of each was taken 

 with a Scovell sampling tube. The tests of these four samples 

 are given below, together with the results from the individual 

 tests: 



Morning milk. Night milk. 



Sample taken at the farm, with 



dipper 4.4 per cent. 3.8 per cent. 



Sample taken at creamery, with 



Scovell tube 4.5 per cent. 3.7 per cent. 



Calculated from weights and tests 



of milk from each cow 4.5 per cent. 3.8 per cent. 



The figures given show that practically uniform tests were 

 obtained by the different methods of sampling. 



The sum of the weights of the milk from the different cows 

 was as follows: 



Morning milk. Night milk. Daily milk. 



Total milk produced 113.3 Ibs. 130.9 Ibs. 244.2 Ibs. 



Milk in samples 12.3 Ibs. 8:9 Ibs 21. 2 Ibs. 



Milk for family use 2.5 Ibs l 2.5 Ibs. 



Milk taken to creamery.. 98.5 Ibs. 122.0 Ibs. 220.5 Ibs. 

 It has already been shown from the weights and tests of each 

 cow's milk that the herd milk contained 4.1 per cent, of fat. 

 Multiplying the total milk delivered at the creamery, 220.5 Ibs., 

 by .041 gives 9.04 Ibs. of fat. The morning and night milkings, 

 which were weighed and tested separately, contained the fol- 

 lowing quantities of butter fat: 



Morning milk 98.5 Ibs. X. 045=4.43 Ibs. of butter fat. 



Night milk 122.0 Ibs. X. 038=4. 63 Ibs. of butter fat. 



Total 220.5 Ibs. 9.06 Ibs. 



