A STUDY OF RATIONS FED TO MILCH COWS. ake 
pound; in the second group seven cows had two pounds each; 
in the third group three cows had three pounds each. There 
was .3 pround of digestible protein in each pound of the mix- 
ture. In this way the quantity of protein fed was regulated by 
the productiveness of the cow. 
TABLE 42. 
Summarized results with Herd P, tests Nos. 51 and 53. 
[First test Dec. 4-16, 1899. Second test Jan. 2-13, 1900.] 



DIGESTIBLE NUTRIENTS |Av. DAILY 








AND FUEL VALUE. VIELD: ; = o 
m ges SORES a) a | 2 
4 fo) a BD a 
oe Wins ake oke a Ses 
oi el | Pa carat Veber ee See ie Sait 
Beh Behe Bilbo rey BE | rap olay ct 
ee Gee UE SRT URES a ita) Ce ec eee hie Ato we Oto) 
é OP) 2 let | a} o}e]s 
Group A, 2 cows: Tbs.\Gbs| Lbs. |. Cal.) 1: |. Lbs.) Lbs.| Cts. | $.-) Cts. 
Ist test, - - - |2.71|.66/12.99/31990|5.3/10.3) .65/22.4/2.17/34.5 
2d test, - - - |2.33].64/11.35/28150/5.5]} 9.1} .62)/18.2/2.00/29.4 
Group B, I cow: 
Ist test, - - - |2.71|.66|12.99/31990|5.3/11.7| .Q0/22.4/1.91/24.9 
2d test, - - - |2.71|.72|I1.74|29920|4.9|11.9| .g9/19.6|1.65/19.8 
Group C, 7 cows: 
Ist test, - - - |2.71}.66)12.99/31990|5.3/15.5| .97/22.4/1.44/23.1 
2d test, - - - |2.99|.80|12.02/31290)4.6/15.0) .99|20.7/1.38/20.9 
Group D, 3 cows: 
Ist test, - - - |2.71|.66/12.99/31990/5 .3/25.2/1.37/22.4, .89/16.3 
2d test, - - - |3.22|.84/12.24/32300/4.4/25.0|1.39/21.6) .86/15.5 
Average of herd, 13 cows: 
Ist test, - - = |%.71).66)12.99)381990/5.3/16.6/1.01/22.4/1.35/22.2 
2d test, ay Nhat 3% 2.92). 79|11.95'30935/4.7/16.2/1.03/20.4)1.26/20.0 







Comparing the data obtained in the two tests, as summarized 
in Table 42, it will be observed that for the whole herd the 
average daily cost of the ration in the first test was 22.4 cents, 
and in the second test 20.4 cents, while the average daily milk 
flow was 16.6 pounds in the first test and 16.2 pounds in the 
second, and the average daily yield of butter was 1.01 pounds 
in the first test and 1.03 in the second. The cost of produc- 
ing 100 pounds of milk was 9 cents less, while the cost of 
producing one pound of butter was 2.2 cents less, in the second 
test than in the first. A comparison of the data for the dif- 
ferent groups of cows in the second test, which were given 
rations differing according to the yields of butter fat, with the 
data for the same group of cows as fed in the first test shows 
11 
