278 Pork Production 



In Table CXXI, only the two rations included 

 within the same two double lines are comparable. In 

 the first section linseed-oil meal is compared with 

 shorts or middlings, the former supplement, based on 

 the averages of six experiments, giving the better results. 

 In the second section, linseed-oil meal and soybean meal 

 are compared, the results indicating almost equality of 

 value. In the same way tankage is proved slightly 

 superior to linseed-oil meal as a supplement to corn as 

 shown in the third section, and skim-milk or buttermilk 

 superior to tankage in the fifth or last part of the table. 

 The reasons why the results of the corn and tankage 

 ration as shown in the last part of the table are not as 

 favorable from the same ration when it was compared with 

 corn and linseed-oil meal, are probably due to one or 

 more of the following factors : the age or thrift or breed- 

 ing of the pigs, the length of the experiments, or the fa- 

 vorableness of the weather or other general conditions. 



Owing to the variation in the amount of protein con- 

 tained by the different nitrogenous supplements, some 

 must be fed in larger amounts than others. In some 

 of the rations included in this summary, the amount 

 of supplements fed was excessive, while in the others 

 less was fed than necessary to insure an adequate supply 

 of protein. The relation between the price of corn and 

 that of the supplement, and the relation of feed to pork 

 prices, is probably the reason for the variations noted. 



In Table CXXII is stated the proportions in which it 

 is necessary to feed the different supplements in order 

 to supply -approximately the same proportion of pro- 

 tein in a corn ration. Under average conditions, the 

 experimental feeding trials already studied would indi- 

 cate that a nutritive ration of 1 : 6.35-6.50 (that is, 



