561 



explained, both the method aud the tigiires assumed for energy in the 

 different nutrients are to be regarded as tentative. The object is 

 simply to afford a means of comparing the quantities of actual nutri- 

 ents in the rations). 



Thirteen series of exi)eriments were made and are here summarized. 

 Of these series seven, A-G, were with milch cows; three, H, I, and K, 

 with fattening steers; and thi-ee, L, M, and X, with fattening- sheep. 



EXPERIMENTS WITH MILCH COWS. 



In each of these experiments three different rations were used. They 

 differed in the relative amounts of beet or potato residue and dry food 

 in the tests with watery foods, and in the relative amounts of oil meal or 

 barley meal in the tests with concentrated foods. In order to make up 

 for the natural changes in the milk during the period of lactation, each 

 series was divided into five periods. In periods I and V, the first and 

 last, the smallest ration; in periods II and IV the medium; and in ])eriod 

 III the largest was fed ; that is to say, the rations increased from the 

 first to the middle and then decreased to the last. 



For the analyses of the milk samples were taken from each milking 

 of each cow. The amount of each sample was proportioned to the 

 amount of milk yielded. Twice each week all the samples of the milk 

 of each cow were put together and an analysis of this united sample 

 was made at the station in Halle. When allowance is made for the 

 natural change in the composition of the milk, as was done by averag- 

 ing the milk of periods I and V and that of II and IV, no influence 

 of the food on the composition of the milk could be traced, the only 

 variation being in the total amount of milk yields. As this was true 

 in all the experiments, no reference will be made to the composition 

 of the milk in the statements which follow. 



Experiments with icatery foods. — Of these there were two series, which 

 may be designated A and B. The periods were 10 days each. The 

 basal ration in each case consisted of hay, straw, barley meal, and oil 

 meal. To the basal ration watery foods were added in different propor- 

 tions in different periods. 



Series A, beet diffusion residue added in different quantities to basal 

 ration. — Conducted by Herr Henneberg in Wasserleben. Nine cows, 

 averaging 1,023 pounds live weight. Basal ration per head per day 

 in pounds, lucern hay 5.5, straw from 8.36 in period III to 12.54 in 

 periods I and V, and peanut meal and barley meal in quantities sufficient 

 to give the wiiole ration the desired composition when fed with difl'usion 

 residue in quantities as stated. 



