188 CHEMISTRY OF FARM PRACTICE 



about one-fourth as much crude fat, the new process being a 

 much more effective means of removing the oil. 



Linseed meal may be fed in small quantities to all classes 

 of live stock with excellent results. It is considerably 

 higher in price than cottonseed meal, and, consequently, 

 there is not the same tendency to over-feed it. 



136. Meat Scraps. Meat scraps, or tankage, is very 

 high in protein. In buying tankage for feeding, care should 

 be exercised to avoid buying acidulated tankage. Tankage 

 is rather a high-priced source of nitrogenous feed. It has 

 been used for cattle, sheep, hogs, and horses with good 

 results. Parts from diseased animals are often incorporated 

 in tankage, and infection from this source is possible, though 

 improbable; not a case of such infection has been reported 

 by any Station experimenting with this feed. In prep- 

 aration, the tankage is cooked by means of steam under 

 pressure to facilitate the removal of the grease. This 

 treatment should produce a sterile condition. This form 

 of protein does not seem to have its digestibility harmfully 

 influenced because of the cooking, for the protein is given 

 as 93 per cent digestible. Tankage is highly prized as a 

 poultry feed. 



137. Dried Fish. Dried fish has been used to some 

 extent as a feed for dairy cows without any harmful or 

 objectionable influence on the quality of the milk. It is 

 highly nitrogenous, containing as high as 48 per cent of pro- 

 tein as well as a high percentage of fat, both of which are 

 highly digestible. In the table of digestibility the protein 

 is given as 93 per cent digestible and the fat as 98 per cent. 



138. Blood Meal. Blood meal is the richest available 

 source of protein, and contains about 84 per cent, of which 

 84 per cent is digestible. It has given good results when 

 fed to hardworked horses at the rate of about 1 pound per 

 day, and when fed to sickly calves in their milk at the rate 

 of from a teaspoonful to a tablespoonful. When fed to 

 pigs, 1 pound of blood meal may replace 12 pounds of skim 



