DAIRY PRODUCTS. 73 



pounds. The mineral matter secured by the cow is how 

 many times that secured by the fattening ox ? 



172. During the same time a fattening ox stores in his 

 body 9.53 pounds of fat, and the cow in her milk secretes 

 6.33 pounds of fat and 8.32 pounds of milk sugar. 

 On basis of heat production, how much more valuable is 

 the product of the cow than that of the fattening ox? 



DAIRY Cows AT PASTURE. 



173. Supplied with an equal amount of food, a fatten- 

 ing ox will gain 3 pounds in live weight for every pound 

 of butter fat produced by the cow. When fat cattle sell 

 at 7 cents per pound, and butter at 30 cents, how much is 

 the difference in favor of the dairy cow ? 



Milk. Milk is Nature's first food for mammals. This 

 is because milk is a perfect food for the young ; it contains 

 water to slake thirst, ash to make bone, protein to make 

 flesh and muscle, fat and sugar to keep the body warm 



