To Increase the Fat in Milk. 83 



in any way changing the conditions under which the animals had hved. 

 At the close of this lactation period, 10 cows from the herd were pur- 

 chased and brought to the University, where they were fed liberally 

 for two years, records of production being constantly kept as before. 

 At the end of the two years, seven cows (three had been disposed of) 

 were returned to the farm from which they were purchased and kept 

 under conditions practically identical with those of the first year, 

 and records kept as before." That is, the experiment is divided into 

 three parts: (1) on a private farm, one lactation period; (2) at the 

 university, two lactation periods; (3) on the private farm again, one 

 lactation period. 



In making the records, the milk was weighed and recorded at each 

 milking and a part taken for a composite sample. The composite 

 samples were preserved for one week and then tested. This course 

 was followed during the whole time of the experiment, both when the 

 cows were at Mr. Gibson's and when they were at the university. 



While the cows w^ere at Mr. Gibson's, he undertook the daily 

 weighing and sampling of the milk. Once each week, an officer of the 

 Station (usually the one in direct charge of the experiment) drove to 

 Mr. Gibson's, secured the records and samples for the preceding week 

 and left fresh bottles for samples to be taken the following week. 

 The samples so secured were brought to the university and the fat de- 

 termined by the Babcock Centrifugal method. 



While the cows were at the university, they were kept with the 

 regular university, herd. The weighing and sampling was done by 

 the regular milkers and the fat determined as before. All the food 

 for each animal was weighed separately during the time the cows 

 were at the university. Wliile at Mr. Gibson's no attempt was made 

 to keep a record of the food by weight ; but a careful estimate of the 

 grain and hay consumed was made. By far the larger part of the 

 food during the time that the records were kept at Mr. Gibson's was 

 pasturage. 



The following table shows the product of each cow for the time she 

 was in milk from March 28, 1900, when the experiment began, till 

 November 7, 1900, for the cows that were left at Mr. Gibson's, and 

 till the close of lactation for the ten cows that were removed to the 

 university. The names of these 10 cows are in bold-faced type: 



