BATIONS FOR FARM ANIMALS 99 



Illustration. One ton of mixed hay contains 88 Ibs. 

 protein and 880 Ibs. carbohydrates. Its ratio is 1 to 10. 

 Let us mix it with some other feed to bring the ratio 

 up to about 1 to 6. We shall try peas. We shall feed 

 1 bu. of ground peas with every hundred Ibs. of hay. 



Feed. Protein. Carbohydrates. 



100 Ibs. hay contain 4.4 44 



60 Ibs. peas contain .... 10. 32 



160 Ibs. mixed contain... 14.4 76 



Dividing weight of carbohydrates by that of protein 

 (76 by 14.4) we get a ratio of about 1 to 5. We have 

 more protein than we need. Let us try again with ^ bu. 

 of peas instead. 



Feed. Protein. Carbohydrates. 



100 Ibs. hay contain 4.4 44 



30 Ibs. peas contain.... 5. 16 



130 Ibs. mixed contain . . . 9.4 60 



Again dividing (60 by 9.4) we get 6.3, about right, 

 and a much cheaper feed. Now, how much of this ration 

 shall we feed to a dairy cow? The table shows us that 

 a cow needs about 2 Ibs. protein daily, so this will be 

 about enough for five days. One-fifth of each feed will 

 give us as a result 20 Ibs. of hay and 6 Ibs. of peas for 

 the daily ration. 



16. With the ration given in the illustration, how 

 long will a ton of hay last a cow? 



17. How many bushels of ground peas will be re- 

 quired in the same time? 



18. What will it cost to feed the cow for this time 

 with hay at $7 per ton and peas at $1 per bushel? 



