412 Western Live-stock Management 



be used for longer than six weeks. It can usually be 

 obtained at a price little above that of linseed-oil 

 meal. 



Tankage, one of our best supplements, is a by-product 

 of the meat industry. Scraps of meat and other offal 

 from the slaughter houses are cooked in a closed steam 

 tank to remove all the grease. After the grease is skimmed 

 off the residue is dried and ground and the better grades 

 used for pig feed and the poorer grades for fertilizer. 

 Tankage is commonly the cheapest source of supplemental 

 protein, and is likely to remain so, since it is not used by 

 any other stock and must, therefore, be sold to the hog- 

 raiser. Tankage is the highest in protein content of all 

 the feeds named, carrying twice as much as linseed and 

 soybean meal, and a fourth more than cotton-seed meal. 

 It may be fed for an indefinite period without injurious 

 results. It carries nearly seven times as much protein as 

 barley or corn, and costs but twice as much."'. 



In localities adjacent to creameries and cheese factories, 

 skim-milk, buttermilk, and whey are often available in 

 larger quantities than are needed for younger pigs, and 

 these by-products of the dairy industry all have value 

 for fattening pigs. Used in quantities of two to ten pounds 

 a head, the Oregon Experiment Station has found skim- 

 milk to have a value of about 22 cents a 100 pounds as 

 compared with tankage at $45.00 a ton. As compared 

 with barley feeding alone, it doubtless has a much 

 higher value than this. Some experiment stations give 

 it a value double this, when compared with corn feed- 

 ing alone, but it is obviously more fair to compare it 

 with the cheapest satisfactory source from which sup- 

 plemental protein can be secured, since grain alone is 

 always unsatisfactory. 



