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2 eS 

A STUDY OF RATIONS FED TO MILCH COWS. —-- ‘ISI 
The table which follows gives a comparison between the re- 
sults obtained with corresponding groups of cows in the first 
and the second tests. In the first test both the groups were 
fed alike; in the second test the amount of protein in the ra- 
tion was regulated by the production of butter fat. On the 
average for the whole herd, however, the amount and propor- 
tion of the digestible nutrients did not vary widely in the two 
rations, although the second ration had a somewhat narrower 
nutritive ratio. The average daily yield of milk with the 
first ration was 13.9 pounds, and with the second ration 16.3 
pounds, while the daily yield of butter was .88 pounds with 
the first and .98 pounds with the second ration. The daily 
cost of the second ration was practically the same as that of 
the first, while the average cost of 100 pounds of milk was 21 
cents less, and the cost of a pound of butter was 2.4 cents less, 
with the second ration than with the first. 
TABLE 43. 
Summarized results with Herd O; tests Nos. 52 and 54. 
[First test Dec. 18-30, 1899. Second test Jan. 15-27, 1g00.] 


DIGESTIBLE NUTRIENTS Av. DAILY 

| AND FUEL VALUE. YIELD. ae a 3s 
| fs eae te ee 
iglelails |Elajgl3l 2: 
re i=lselu l/S/2/2/8/3 18 
ie # 2 2 eee Saris 
| z oie 
Group A, 3 cows: “Lbs. Lbs Lbs. | Cal. | 1: |; Lbs.| Lbs.| Cts.| § | Cts. 
Ist test, - - - |2.23}. 56 11.98/288006.1 10.5 .70 19.5 1.86 27.9 
2d test, - . - 1.99 ae 60/254405.9 11.6 .7417.81.53 24.0 
Group B, 5 cows: / 
Ist test, - - - (2.23 56 11.98 288006.1 16.0 .98 19.5 1.22 19.9 
2d test, - hey 4 60 -60 11. 27 7833014. 6 19.11.1220. 3ir- 06 18.1 
Average of herd, re cows: | 
Isttest, - - ~ (9.93 .06 11. 98 28800 6. 113.9 .8819. 51. 40 22.2 
adtest, - - ~- (2.87 .5611.02272505.216.3 .9819.41.1919.8 
The differences between the yields in the two tests were 
probably not due entirely to the differences in rations. During 
the first test most of the cows of the herd were attacked with 
diarrhoea for two or three days, and one for a longer period. 

