150 EXPERIMENT STATION. [Jan. 



European fish meal is guaranteed to contain 59 per cent, pro- 

 tein, 2 per cent, fat, and has been found to be fully 90 j)er cent, 

 digestible. 



Kellner recommends 3 to 4 ounces daily for young pigs and 

 calves, which amount may be increased to 16 ounces, depending 

 upon the size of the animal and the richness of the other foods 

 in nitrogenous matter. Milch cows may be fed as high as 2 

 pounds daily without any objectionable taste being noted in the 

 milk or butter. Sheep and horses do not take the meal readily, 

 but its consumption can be brought about by mixing it with 

 other grains ; about one-half pound daily is recommended.^ 



In the United States up to the present time the various resi- 

 dues from slaughterhouses and fish factories have been utilized 

 chiefly as sources of plant food. Of late the large packers have 

 endeavored to popularize such material in place of or as a sup- 

 plement to protein concentrates of vegetable origin. Large 

 amounts of meat scraps and meals are consumed in the rapidly 

 increasing poultry industry, and several brands of specially 

 prepared or digester tankage and dried blood are recommended 

 and ofi^ered for sale although not generally distributed in local 

 markets. 



Tankage for animal feeding is prepared " from scraps of meat 

 of cattle and hogs (lungs, tendons, bones, etc.), cooked for four 

 hours in large steel tanks under 25 to 40 pounds' pressure. . . . 

 The tankage is then pressed, to remove the excess of water and 

 fat, after which the feed is dried and ground." The highest 

 grade contains about 50 to GO per cent, protein, 10 to 15 per 

 cent, fat and 6 to 10 per cent, bone ash, and has a noticeal)le 

 odor. It is recommended chiefly as a supplement to corn for 

 feeding pigs, in the proportion by weight of 1 part tankage to 5 

 to 10 parts corn. While a proportion of 1 to 5 has given slightly 

 better results, the opinion is expressed by several experimenters 

 that so large a proportion of tankage is not as profitable as the 

 smaller amount.^ It seems probal)le that 1 part tankage to 5 

 parts corn could be given advantageously to young ]ugs, and 



1 Kellner, Die Ernahrung d. landw. Niitzthlero, pi). 309-371. 



2 Iowa Experiment Station Bulletin No. 05; riirdue Experiment Station Bulletin Nos. 

 90 and 108; Micliifran Experiment Station Bulletin No. '237; Nebraska Experiment Station 

 Bulletin No. 04; South Dakota Experiment Station Bulletin No. 90; Virginia Experiment 

 SUitiou Bulletin No. 167. 



