1909.] PUBLIC DOCUMENT — No. 31. 151 



the proportion of corn increased as the process of fattening 



progressed. 



The Massachusetts station fed Swift's digester tankage to 

 two dairy cows in place of twice the amount of high-grade dis- 

 tillers' grains (33 per cent, protein). One-half pound of tank- 

 age daily was first fed and the amount gradually increased to 

 li/o pounds per day; the total grain ration consisting of 4 

 pounds wheat middlings, 1 pound distillers' grains and li/o 

 pounds tankage, or 5 pounds molasses beet pulp, 2 pounds mid- 

 dlings and ll/o pounds tankage. Neither of the animals made 

 any objections to the tankage when mixed with the other grains, 

 in spite of its noticeable odor. Frequent samples of milk were 

 examined, both cold and at a lukewarm temperature, but it was 

 not possible to detect any flavor or odor that could be attributed 

 to the meat product. It is hardly considered advisable, however, 

 to feed such material to dairy stock. 



2. Dried Blood foe Stock. 

 Dried blood for feeding purposes is prepared by heating the 

 fresh blood of cattle and swine in large tanks at 212° F. The 

 excess of water is removed from the coagulated mass by means 

 of heavy presses and the material then passed through steam 

 dryers and eventually ground and liagged. As thus treated it 

 appears as a dry, friable powder of dark color and with only a 



slight odor. 



One finds comparatively few experiments described and little 

 said in agricultural publications relative to the value of blood 

 meal for animal nutrition. Kellner^ states that "when it is 

 prepared without being overheated, it has proved itself to be a 

 very easily digested protein food stuff, suitable for all farm 

 animals, readily consumed and to be fed in the same amounts 

 as meat meal. It is found to be quite satisfactory as a constitu- 

 ent of fodder bread and biscuit and of the less valuable 



molasses feeds." 



In the United States several stations ^ report feeding trials 

 with blood combined with carbonaceous foods (corn), in which 



1 Already cited. . 



2 Missouri AKricultiiral College Bulletin Nos. U, 19; Wisconsin Experiment Station Re- 

 ports, 1880, 1887, 1888, 1839. 



