514 



STATE BOARD OF AGRICULTURE. 



purposes, it becomes necessary', if the best results are to be secured to 

 purchase it or some other protein feed to combine with the cereal grains 

 for feeding pigs. Tankage, middlings and oil meal are the feeds most com- 

 monly used in place of skim milk for feeding pigs and in order tliat a com- 

 parison of these different supplements may b(^ made, a large number of 

 feeding trials from different Experiment Stations have been summarized 

 in the following table. These tests included pigs of varions weights and 

 ages fed on cereal grains (including corn, wheat, rye and barley) with 

 some one of the above mentioned nitrogenous supplements, and are 

 grouped here accordingly. The last group, where soy beans were nsed 

 as a supplement, represents only 29 pigs, so that these results would not 

 be as reliable as in the other cases where data was available from a larger 

 number of feeding trials. 



VALUE OF SKIM MILK AS COMPARED TO OTHER NITROGENOUS 

 SUPPLEMENTS TO CEREAL GRAINS. 



By comparing the first two lots in the table we find that 486. 5 pounds 

 grain was required to produce 100 pounds gain and that 266.9 pounds 

 grain supplemented by 785.1 pounds skim milk produced 100 pounds gain. 

 Therefore, 785.1 pounds skim milk replaced 219.6 pounds grain or 357.5 

 pounds skim milk replaced 100 pounds grain. With the tankage fed lot, 

 879.3 pounds grain supplemented by 42.5 pounds tankage produced 100 

 pounds gain. 



Therefore 42.5 pounds tankage replaced 107.2 pounds grain 

 or 89.6 pounds tankage replaced 100 pounds grain. 



In like manner 95 pounds middlings replaced 100 pounds grain 



88.2 pounds oil meal replaced 100 pounds grain 



33.3 pounds soy bean meal replaced 100 pounds grain 

 Comparing these values with the replacement value of skim milk when 



used as a supplement to corn and other cereal grain, 



1 pound tankage is equivalent to 9 pounds skim milk 



1 pound middlings is equivalent to 8.7 pounds skim milk 



1 pound oil meal is equivalent to 9.8 pounds skim milk 



1 pound soy bean meal is equivalent to 10.7 pounds skim milk. 



The following table, based on these figures, shows the value of skim 

 milk as compared to these other feeds as supplements to grain feeds. 



