THE FEEDING OF MILCH CATTLE 343 



milk in the case of the fodder with the higher starch 

 equivalent the clover hay although both rations 

 contained the same amount of nutrients. 



Other investigations with milch sheep and goats 

 confirm the statement that calculations with starch 

 equivalents are sound and correct. 



As cow's milk contains on an average 7-4 g. 

 mineral substances, amongst which are 1-8 g. lime 

 and 1-5 g. phosphoric acid, it is necessary that the 

 food should supply these amounts if the body is not 

 to be depleted of them. Further, as only J to \ of 

 the lime and phosphoric acid in the ration can be 

 utilised (p. 287), there would be in the case of 20 kg. 

 milk per 1000 kg. live weight no less than 70-110 g. 

 lime, and 60-90 g. of phosphoric acid required 

 in the food. If to these numbers there be added 

 the maintenance requirements (p. 246) of 100 g. 

 lime and 50 g. phosphoric acid, the total require 

 ments for the above quantity of milk will be 200 g. 

 lime and 140 g. phosphoric acids, or 3^ oz. and 2j oz. 

 for 20 Ibs. of milk per 1000 Ibs. live weight. Higher 

 yields of milk require proportionately larger quan- 

 tities of mineral matter. 



Generally the requirements of the body and the 

 milk are amply met by the supply of mineral sub- 

 stances in the food, particularly when good meadow 

 hay, clovers, or good green fodder are given. With 

 those food-stuffs poor in lime and phosphoric acid 

 (p. 97) the addition of phosphate of lime must be 



