DAIRY FARMING DAIRYING. 789 



Cow No. 1 showed fluctuations in the milk yield which could only be 

 accounted for by the feed. When, in the twentieth week of lactation, 

 corn was substituted for rye as the chief grain the average daily milk 

 yield increased 2.52 kg., or 2G percent, and the milk contained 3.52 per 

 cent of fat as compared with 3.26 per cent in the preceding and follow- 

 ing periods. The corn ration contained more digestible crude protein 

 but less albuminoids than the rye ration. In the following period when 

 wheat bran was fed in place of the corn more crude protein was digested 

 and the total nutrients were larger, but the daily milk yield fell off 1,51 

 kg. and the fat content dropped to 3.20 per cent. A mixture of rye 

 and palm cake proved advantageous, as it nearly maintained the yield 

 of milk and increased the fat content from 3.09 to 1.51 per cent. A 

 ration containing poppy cake, in spite of its higher content of digesti- 

 ble protein and total nutrients than rations of cotton-seed meal and of 

 peanut cake, resulted in a falling off in the daily milk yield of 1.6 kg. 

 in 3 weeks, while on the cotton- seed-meal ration the decrease was 1.18 

 kg. in 1 weeks. The poppy cake is consequently less valuable than the 

 other oil cakes. 



Cow No. 2, which during 1 weeks on the peanut-cake ration shrunk 

 0.S8 kg. in daily milk yield, shrunk only 0.31 kg. during L' weeks on 

 cotton-seed meal. In the following period, on poppy cake, there was a 

 much larger shrinkage in milk and a material decrease in the percent 

 age of fat (from 3.15 per cent on cotton-seed meal to 2.51 per cent on 

 poppy cake). Later, after this cow had calved, a rye ration was fed, 

 on which, in spite of only about half the amount of digestible protein, 

 a milk yield of 15.15 kg. with 2.03 per cent of fat was maintained. 

 The author infers from this that the milk secretion depends first of all 

 upon the condition of the milk glands. 



Cow No. 3 had received a malt sprout ration previous to the experi- 

 ment, on which she produced 10.5 kg. of milk. Four weeks later (in 

 the seventeenth week of lactation), on a corn-meal ration, she produced 

 11.32 kg. of milk — an increase of 0.82 kg. — although the amount of 

 albuminoids was relatively small (330 gm.). In the following period, 

 in which wheat bran was fed, there was a shrinkage of 1.32 kg. in 

 milk, although almost exactly the same amount of total nutrients and 

 over 100 gm. more of albuminoids were contained in the daily ration. 



In the experiment with cows 1 and 5 the intention was to test the 

 effect of feeding beet molasses to both cows, but No. 1 refused to eat 

 the molasses. A ration of barley meal and palm cake was compared 

 with one of palm cake and molasses. On the molasses there was a 

 shrinkage of 2.42 kg. in the daily milk yield, but an increase of 0.3 per 

 cent in the fat content. In the following period, when the barley meal 

 and palm cake were fed, the yield increased 1.9 kg., but the fat content 

 diminished. The protein in the molasses ration was relatively low. 

 The excretion of urine in this period increased from about 11 liters to 



