FARMER'S CYCLOPEDIA OF LIVE STOCK 



or 60 pounds of feed A to contain 3 

 pounds of protein, while of the feed B, 

 whose protein equating factor is 8, 40 

 pounds (5 x 8) must be taken. In com- 

 pounding these feeds to secure the de- 

 sired nutritive ratio, therefore, they 

 must be taken in the proportion of 60 

 to 40 or, reducing, 3 to 2. If feeds A 

 and B are mixed in the proportions of 

 3 pounds of A to 2 pounds of B then 

 the nutritive ratio of the mixture will 

 always be 1 :9. Whatever quantity of 

 this mixture is taken to mix with the 

 grain or other feeds in compounding a 

 ration, this ratio will be preserved. 



Second term 

 of ratio 

 ( Mixed hay 11.0 



A < Required mixture 5.7 



( Bran 4.0 



i Corn silage 13.7 



Bi Required mixture 5.7 



( Linseed meal 1.5 



( Corn meal 11.7 



C < Required mixture 5.7 



( Bran 4.0 



The feeds are arranged in couplets f 

 which one of each pair must have a 

 nutritive ratio wider than the desired 

 ratio and the other narrower. Hay has 

 a nutritive ratio of 1 :11, which is 

 wider than the desired ratio (1:5.7), 

 while bran, with which hay is paired, 



Fig. 46 — A GOOD FORM OF STOCK 

 FEED COOKER 



has a nutritive ratio of 1 :4, which is 

 narrower than the desired ratio (1:5.7). 

 So in couplet B and couplet C. One 



Let us compound a ration according 

 to this method for dairy cows giving 20 

 pounds of milk which shall have a nutri- 

 tive ratio of 1 :5.7, using the same feed- 

 ing stuffs as before, viz: hay of mixed 

 grasses, corn silage, corn meal, bran and 

 linseed meal, old process. From the 

 table, page 83, we obtain the second 

 terms of the nutritive ratios of these 

 feeds, and the protein equating factors, 

 and comparing the feeds with each 

 other in pairs with the desired nutritive 

 ratio by the method of alligation, we ob- 

 tain the following figures : 



Protein equat- Mixture 

 Difference ing factor necessary 



1.7 X 23.7 40 



5.3 



4.2 



8.0 

 1.7 



6.0 



X 8.3 

 X 82.6 



3.3 



1.6 



8.3 



44 

 347 



26 



27 



50 



feed with a wide nutritive ratio is com- 

 pared with another having a narrow nu- 

 tritive ratio. 



Notice in this example we have five 

 kinds of feeds, three of which have a 

 wider nutritive ratio than that desired 

 (1:5.7) and two narrower. In order to 

 balance the three wide rations against 

 the two narrow ones, one of the narrow 

 rations must be taken twice. We have 

 used bran twice. We could have used 

 linseed meal twice instead of bran just 

 as well. We would have obtained the 

 same result so far as nutritive ratio is 

 concerned, but the quantities of each 

 feeding stuff used in compounding the 

 ration would have been changed slightly. 



If only one of the five feeds had had 

 a nutritive ratio narrower than the de- 

 sired one, then it would have been nec- 

 essary to compare each feed having the 

 wider ratio with the one having the nar- 

 row ratio. 



Now we are ready to examine the last 

 column of the above table a little more 

 critically. As it now stands it shows 

 that if we take 40 pounds of hay, 

 44 pounds of bran, 347 pounds of 

 silage and so on down the column, and 

 mix them we will have a mixture whose 

 nutritive ratio will be 1 :5.7, and we can 

 feed as much of this as we desire. These 

 figures are rather large and we can per- 

 haps see their relationship better by 

 reducing them down. By using the smal- 

 lest number 26 — that for oil meal — 



