DAIRY FARMING DAIRYING. 580 



The yield of milk fell off one third in the second period on cocoa- 

 molasses, believed to be due to the deficiency in protein. The addition 

 of peanut cake in the following period resulted in an increase in yield. 

 The corn bran had a favorable effect on the yield. The fat content of 

 the milk showed wide fluctuations in different periods. Molasses is 

 believed to have had a favorable effect on the fat content wherever it 

 was fed, while the corn bran tended to reduce the fat content. As to 

 the effect of the rations rich in fat, it is believed that there was no 

 apparent relation between the high fat content of the ration and the fat 

 content of the milk. On the two rations rich in fat (periods 4 and 8) 

 the fat content of the milk was below the average, while on the ration 

 poorest in fat (periods 1 and 10) the fat content was above the average. 

 The rations containing corn bran gave the largest production of solids- 

 not-fat. The malt sprouts and linseed cake gave aa increase in live 

 weight when they were fed alone or when fed in combination with other 

 feeds. There was a small decrease in live weighton the molasses rations. 



In conclusion, the authors state that in agreement with previous 

 results a high fat content of a ration by no means resulted in the pro- 

 duction of milk of a high fat content. It is believed, therefore, that 

 little attention need to be paid to the fat content of the ration beyond 

 providing a certain minimum amount — i. e., 0.4 to 0.7 kg. per 1,000 kg. 

 live weight, and that the nitrogen- free nutrients required in excess 

 of this can be more cheaply supplied in the form of carbohydrates. 



The different feeding stuffs are considered to have brought about 

 unusually large differences in the percentage of fat in the milk. Exclud- 

 ing the second ration, which was low in fat, the fat content of the milk 

 on normal rations ranged from 2.327 (period 7) to 3.437 per cent (period 

 3), a difference of 1.11 per cent. This, it is believed, can not be 

 attributed to the slight differences in the composition of the ration, but 

 supports the theory that different feeding stuffs have a specific action 

 sufficiently strong to affect the value of a ration. In determining the 

 value of a feeding stuff, not only the proportion of nutrients must be 

 considered, but also the specific action of the material, and this can be 

 determined only by direct experiment, at least until we understand the 

 principle on which this specific action rests. 



As to the relative value of the new feeding stuffs tested, the cocoa- 

 molasses proved to be a good and cheap concentrated feed for cows ; 

 the molasses-distillery- waste in the form in which it was used gave a 

 negative result ; the corn bran was eaten readily by the cows in large 

 quantity without ill effect, and as it appeared to have a favorable effect 

 on milk secretion it can be recommended ; and the blood-molasses is to 

 be regarded as a most valuable concentrated feed. 



The comparative value of buckwheat middlings, dried brew- 

 ers' grains, and Cerealine for milk and butter production, H. 

 Hayward and R. J. Weld (Pennsylvania Sta. Bah 41, pp. 18, dgm. 1). — 

 The experiment was with 12 cows and covered 3 periods of 40 days 



