
, eG < 
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300 Rerort OF THE CHEMIST OF THE 
general conclusions from the results presented ; for, until we have 
complete results from all the individuals of each breed, we can not 
establish any conclusions that may be regarded as definite and 
reliable. However, it will be seen that very much interest 
attaches to the results thus far obtained. 
In order that those who are not acquainted with the previous 
history of this investigation may have a complete understanding 
of the character and objects of the work, they are referred to the 
following Station publications for the plans proposed and the 
results already secured : 
(1.) Eighth annual report of director (1889), pp. 14-91. 
(2.) Eighth annual report of chemist (1889), pp. 153-208. 
(3.) Bulletin No. 18, new series, November, 1889, on “'Testing 
of Dairy Breeds.” 
(4.) Bulletin No. 20, new series, June, 1890, on ‘“‘ Pedigrees of 
Animals under Investigation.” 
(5.) Ninth annual report of chemist (1890), pp. 173-242. 
(6.) Ninth annual report of farm superintendent (1890), pp. 
400-444. 7 
(7.) Bulletin No. 34, new series, August, 1891, on “ Comparison 
of Dairy Breeds of Cattle with Reference to Production of 
Butter.” 
For a full description of the chemical work connected with this 
investigation, and for a full statement of the methods employed 
in creaming, churning, etc., the reader is referred to the chemist’s 
report for 1890, pp. 197-206. 
LenetH oF Lactation PERIOD. 
The unit of time adopted for the purpose of comparing the 
breeds in regard to their production of milk, butter and cheese is 
the first ten months of each period of lactation. While the period 
of ten months is probably considerably longer than the average 
lactation period of the cows of the average dairyman, the present 
tendency in the best dairy practice is to utilize the cow as long as 
possible, and with our best dairymen, the lactation period is pro- 
bably made to equal or exceed ten months in duration. 
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