206 SCIENTIFIC FEEDING OF ANIMALS 



large extent the protein substances. The undis- 

 solved portion, after being washed almost free from 

 starch, consists principally of husks, germs, and 

 starch, and is called rice slump, which can be fed 

 either fresh, pressed, or dried, like the wheat slump. 

 The dissolved protein is precipitated by hydro- 

 chloric acid, or by a stream of carbon-dioxide gas, 

 and is then sometimes dried and ground ; it is the 

 rice gluten. 



Various by-products from the manufacture of 

 starch from maize are used as cattle foods. The 

 grains of maize are usually soaked in water con- 

 taining a little sulphur dioxide, and then, by means 

 of machinery, the outer horny parts and germs 

 are separated from the flour, and all is then stirred 

 up with water. The germs which collect on the 

 surface are used for the preparation of oil, and 

 after pressing give maize-germ cake. From the 

 sediment the starch is separated by means of sieves, 

 and the husks, mixed with the gluten from the 

 further purification of the starch, are dried and 

 give gluten feed, as it is generally called. All 

 these by-products are used in the same way as 

 maize itself, only in smaller quantities, and they 

 have given good results. The germ cake or meal 

 is a very palatable food, and only affects the bacon 

 or flesh of pigs if large quantities are given. 



