1904.] 



PUBLIC DOCUMENT — No. 33. 



49 



Table IV. — Average Qaanlity of Milk j^t'odticcd hy Each Cow. 



(^Pounds.) 



During the first period both lierds produeed essentially the 

 same average quantity of milk per cow ; during the second 

 and third periods, presumably because of the increased sup- 

 ply of protein in the daily ration, Herd II. showed a slightly 

 larger average yield. 



Purity of the Milk. — A number of samples of the mixed 

 milk were taken immediately after milking, placed in steril- 

 ized glass-stoppered bottles, and kept cold until examined 

 for bacterial content. The number of bacteria varied from 

 200 to 3,600 to the cubic centimeter, showing the milk to 

 be especially clean. Objectionable odor or flavor could not 

 be detected. 



SamiMng the Milk. — Composite samples of the mixed 

 milk from each herd were taken for five days in each week, 

 and tested for total solids, fat and nitrogen. The solids 

 were determined by drying in sand, the fat by extracting 

 the dry material with ether, and the nitrogen by the Kjeldahl 

 method. In securing a sample, the milk from each herd was 

 carefully mixed, and a small dipperfull taken immediately. 



Table V. — Composition of Milk {Per Cent.). 

 First period : both herds, standard ration. 



