New York Agricultural Experiment Station. 



37 



(3) 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 mikh 

 cow. 



THE digestibility OF THE RATIONS. 



The figures which immediateh^ follow show the extent to 

 which the rations were digested. 



Digestibility of Rations. 



Dry sub- 

 stance. 



Organic 

 matter. 



P-te.„. C-^^,\y- 



Ash. 

 Coir 12. during 1st Qrams. Grams. Grama. Grams. Grama. 



period. 7 days 

 (Jan. 30-Feb. G) 



In foods 909S5.1 8G594.5 4390.6 12371.9 73340 



In feces 27698.6 24894.7 2803.9 4210.6 19981. S 



Digested 63286.5 61699.8 1586.7 8161.3 53358.2 



Percentage di- 

 gested 69.6 71.3 36.1 66.0 72.8 



Eaten daily, lbs. 19.9 19.4 0.5 2.6 16.8 



Nutritive ratio 1:6.3 

 Cow 12, during 2d 

 period, 7 days 

 (Feb. 19 to 26n 



In foods 92657 . 8 88259 . 6 4398 . 2 11261 . 9 76105 . 2 



Id feces 28528 . 1 25935 . 1 2593 . 4409 . 4 20850 . 1 



Digested 64129.7 62324.5 1805.2 68.52.5 55255.1 



Percentage di- 

 gested 69.2 70.6 41.0 60.9 72.6 



Eaten daily. lbs. 20.2 19.6 0.6 2.2 17.4 



Nutritive ratio 1:8.0 

 Cow 12, during 3d 

 period, 8 days 

 March 8 to 16). 



lu foods 105344 . 1 100308 . 7 5035 . 4 10538 . 1 88776 . 6 



In feces 34.509.2 31587.6 2921.6 4774.4 26077.7 



Digested 708.34.9 68721.1 2113.8 5763.7 62698.9 



Percentage di- 

 gested 67.2 68.5 42.0 54.7 70.6 



Eaten daily, lbs. 19.5 18.9 0.6 1.6 17.3 



Nutritive ratio 1:10.9 



Ether 

 extract. 



Grams. 



882.6 

 702.3 



180.3 



20.4 

 0.00 



892.5 

 675.6 



216.9 



24.3 



0.05 



9W.0 

 735.5 



258.5 



26.0 

 0.07 



