FACTORS THAT AFFECT COMPOSITION OF MILK 55 



Effect of Variations in Ration upon the Milk 



Cow 12. Vakiations in Protein Supply 



Period 



Jan. 30 to Feb. 6 



Feb. 6 to 16 . . 

 Feb. 16 to 26 . 



Feb. 26 to Mar. 8 



Mar. 8 to 18 . . 



Mar. 18 to 28 . 



Mar. 28 to Apr. 7 



Apr. 7 to 14 . . 



Changes in Ration 



Maximum protein fed (2.6 lb. 

 daily) 



Maximum protein fed . . . 



Protein diminishing, carbohy- 

 drates increasing .... 



Protein still diminishing, carbo- 

 hydrates still increasing 



Protein at minimum (1.6 lb. 

 daily) 



Protein increasing, carbohy- 

 drates diminishing . . . 



Protein still increasing, carbo- 

 hydrates still diminishing . 



Protein at maximum (2.6 lb. 

 daily) . 



Milk 

 Yield 

 Daily 



Solids 



in 

 Milk 



lb. 



per ct. 



35.1 



12.92 



32.2 



13.04 



30.1 



13.36 



28.4 



13.37 



26.0 



13.47 



26.1 



13.65 



26.5 



13.73 



26.1 



13.78 



Fat 



in 



Milk 



per ct. 



3.72 

 3.68 



3.92 



3.87 



4.01 



4.05 



4.11 



4.08 



Cow 10. Variations in Food Fat Supply 







lb. 



per ct. 



per ct. 



Jan. 30 to Feb. 6 



Normal ration (fat fed daily 











8 1b.) 



22.9 



14.31 



4.74 



Feb. 6 to 13 . . 



Ration unchanged .... 



22.8 



14.20 



4.74 



Feb. 13 to 20 . 



Ration unchanged . . .f. 



22.8 



14.20 



4.75 



Feb. 20 to 27 . 



Ration unchanged . . . . 



23.5 



13.90 



4.46 



Feb. 27 to Mar. 6 



Food fat increasing .... 



23.4 



14.09 



4.60 



Mar. 6 to 13 . . 



Food fat at maximum (1.4 lb. 











daily) 



23.7 



14.17 



4.76 



Mar. 13 to 20 . 



Food fat diminishing . . . 



24.6 



13.81 



4.44 



"Cow 12 fed a fat-poor ration in which the protein supply 

 was gradually decreased from 2.6 lb. daily to 1.6 lb. and then 

 gradually restored to the maximum, with accompanying in- 

 crease and decrease in carbohydrates so that the digestible dry 

 matter of the ration was kept fairly uniform; Cow 10 fed a 



