July 23. 1917 Effect on Growth and Reproduction of Rations 



i«i 



was added, in which case the amount was made equivalent in basicity 

 to the basicity of a mixture of the three salts. While, of course, single 

 salt additions did not make the ash of the wheat and wheat-straw ration 

 comparable with that of the corn ration, it did serve to correct its acidity. 

 We have also stated that failure in reproduction resulted when a corn- 

 grain and wheat-straw ration was used. If our theory was correct, that 

 the main deficiency of this ration was a proper mineral content, then 

 salt additions could be made with normal results; and such was actually 

 the case. In Table III are brought together the records of such studies. 

 The amounts of carbonates added to 14 pounds of the ration were 13 

 gm. of calcium carbonate, 21 gm. of magnesium carbonate, and 47 

 gm. of potassium carbonate. In the case of the organic salts we used 

 40 gm. of calcium lactate [Ca(C3H503)2 + 5 HjO]; 60 gms. of magnesium 

 citrate [Mg3(C6H507)2 + i4H20]; and 80 gm. of potassium citrate 

 (KgCgHgO^ + H2O) . When calcium lactate was used alone 232 gm. were 

 added to 14 pounds of the ration; where the salt was magnesium citrate 

 alone 181 gm. were used, and where potassium citrate was the only salt 

 163 gm. were employed. In Table III the numbers of the cows may 

 appear repeated, owing to the fact that it records several gestation peri- 

 ods of a single individual. In addition to the table, Plate 25, C-G, is 

 added to illustrate the condition of both mothers and calves on some of 

 the rations. 



T.A.BLE III. — Records of reproduction and milk secretion 



o No milk. 



