332 SCIENTIFIC FEEDING OF ANIMALS 



put together, the following figures are obtained. 

 The plus sign denotes an increase and the minus 

 sign a decrease as compared to the effect of the 

 food poor in fat. 



Average . —27 —37 



Therefore the percentage fat composition of the 

 milk has not changed under the influence of the 

 ration richer in fat. Where, however, the yield of 

 milk diminished the most (7-2%) the percentage 

 amount of fat in the milk rose by almost -3 %, and 

 conversely where the quantity of milk was small 

 the percentage of fat fell by -26%. In the inter- 

 mediate series there was a slight decrease in quantity 

 (2-6%), but no change in the percentage fat com- 

 position of the milk was observed. 



The above investigations, therefore, bring a very 

 satisfactory explanation of the anomalies found in 

 the older experiments, and the conclusion may be 

 drawn that more than -J- lb. food fat per 1000 lbs. 

 live weight brings no advantage, and it is sufficient 

 if the daily ration of a cow contain -5—6 lb. of fat 

 per 1000 lbs. live weight. For sheep and goats the 



