HOW TO BUY FEEDS 63 



us add one other feed for further variety. Wheat bran would be 

 very satisfactory but it is quite expensive. Flour middlings are the 

 cheapest of the remaining feeds but they are rather heavy for the 

 dairy ration. Let us take wheat mixed feed. The next thing is to 

 put together the feeds so as to give the proper protein content. One 

 can set down a trial formula and then compute its protein from 

 Table I in the appendix. How this may be done is shown below: 



500 lbs. hominy 500 x 10.6% = 53.00 lbs. protein 



200 lbs. wheat mixed feed 200 x 16.8% = 33.60 lbs. protein 



100 lbs. gluten feed 100 x 25.4% = 25.40 lbs. protein 



200 lbs. cottonseed meal, 43% 200 x 44.1% = 88.20 lbs. protein 



1000 lbs. will contain 200.2 lbs. protein 



200.24-1000=20.02% protein 



This trial happened to come out exactly 20 per cent. Had it 

 come out one or two per cent below, the ration would still have 

 been satisfactory. A wider variation than this would have caused 

 us to modify the mixture somewhat. 



103. How to buy. — We will assume that a man will make up 

 for use in his herd a mixture similar to the above which will be 

 composed of the four common feeds, wheat bran, hominy, gluten 

 feed, and linseed oil meal. Such a mixture to run 20 per cent 

 total crude protein would be: 



% total Lbs. total 

 Lbs. protein protein 



Wheat bran 400 16.0 64.0 



Hominy 200 10.6 21.2 



Gluten feed 200 25.4 50.8 



Linseed meal 200 33.9 67.8 



1000 lbs. 203.8 



100 lbs. 20.4 



This mixture would be a suitable one to go with red clover hay or 

 with a mixed hay containing more than one-half clover. 



Now, in buying feeds for this mixture we will consider the case 

 where a man will buy these feeds separately and mix them him- 

 self. The case of the purchase of proprietary feeds and feeds pur- 

 chased co-operatively is treated in paragraphs 113, 114, 115 and 

 Chapter VIII. 



