New YorK AGRICULTURAL EXPERIMENT STATION. 37 
(5) The source of milk fat and the relation of milk fat forma- 
tion (a) to protein exchange and (b) to the supply of food fat. 
| (4) The metabolism of nutrients as affected by the composi- 
tion of the ration, 
(5) The energy value of the digestible portion of a ration. 
(6) The distribution of the food energy in maintaining a milch 
cow. 
THE DIGESTIBILITY OF THE RATIONS, 
The figures which immediately follow show the extent to 
which the rations were digested. 
DIGESTIBILITY OF RATIONS. 
Dry sub- Organic Carbohy- Ether 
stance, matter. Ash. Protein. drates. extract. 
Cow 12, during 1st Grams. Grams. Grams. Grams. Grams. Grams. 
Li (f 
period, 7 days 
(Jan. 30-Feb. 6) 
In foods....... 90985.1 86594.5 4890.6 12371.9 78340 882.6 
In feces....... 27698.6  24894.7 2803.9 4210.6 19981.8 702.3 
Digested ...... 65286.5.' 61699.8 <1586:7. 8161.3  53358.2 180:38 
Percentage di- 
gested. :..... 69.6 71.3 386.1 66.0 F200 20.4 
Eaten daily, lbs. 19.9 19.4 fat es Mee 16.8 0.06 
, Nutritive ratio 1:6.5 
Cow 12, during 2d 
period, 7 days 
(Feb. 19 to 26), 
PEPE LOOURe cra 0 0 . 92657.8  88259.6 4398.2 11261.9 76105.2 892.5 
Pipereecs. : «wes » 28528.1 25935.1 2593.0 4409.4 20850.1 675.6 
PUSERCEL: 2. es 2 Dicer. PGecorteol oto “Gsoe ww Decoo.ke I 2lG.e 
Percentage di- 
gested :.*...; : 69.2 70.6 41.0 60.9 %Z.6 24.3 
Eaten daily, lbs. 20.2 19.6 0.6 22 17.4 0.05 
Nutritive ratio 1:8.0 
Cow 12, during 3d 
period, 8 days 
March 8 to 16). 
In foods....... 105344.1 100308.7 5035.4 10538.1 88776.6 994.0 
Tmereces.:... ee OeDUGT a. ~olbor.6) 2921.60 (47744 -2607T.7.-.785.5 
Meirestcus... 46.23 08s4.9 . 6872101 211848 5763.7 62698.9 - 258.5 
Percentage di- 
PORTOO |. fos 5.0 se 68.5 42.0 54.7 70.6 26.0 
Eaten daily, lbs. 19.5 18.9 0.6 1.6 yh: 0.07 
Nutritive ratio 1:10.9 
