30 



As soon as the preliminary trials were concluded, the ten 

 cows selected were divided into two lots as above according 

 to their live-weight, and were put on their respective rations 

 on February 10. At the commencement of the experiment, 

 therefore, the two lots stood as follows: 



Average yield of milk Per cent, of Average 



per cow per day. butter-fat. live-weight. 



Lot 1 23-47 pints. 3'45 1,064 Ib. 



Lot II 25-04 pints. 3'36 1,068 Ib. 



Rations. As the object of the experiment was to test the 

 effect of a moderate and heavy allowance of concentrated food 

 respectively on the quantity and quality of the milk, it was 

 decided that the amount of bulky food supplied to each lot 

 should be the same in both cases, but that one lot of cows 

 should receive 4 Ib. of concentrated food per day more than the 

 other. Accordingly the following rations were fixed upon : 



LOT I. 



8 Ib. con- ( 3 Ib. maize meal. 

 centrated-l 2 Ib. malt dust. 

 food 1^3 Ib. Egyptian cotton cake. 



6 Ib. straw chaff. 



15 Ib. hay. 



60 Ib. roots. 



Albuminoid ratio, 1 : 6*1. 



LOT II. 



. con- (\ Ib. maize meal. 

 centratedl 3 Ib. malt dust. 

 food { 4J Ib. Egyptian cotton cake. 



6 Ib. straw chaff. 

 15 Ib. hay. 

 60 Ib. roots. 



Albuminoid ratio, 1 : 5*7- 



In calculating the ration for lot I., care was taken 

 that each animal should, on the average, receive in its 

 daily ration the minimum amount of organic matter 

 required. With a view to making a sufficient allowance for 

 individual differences among the cows, the ration was 

 calculated for 1,150 Ib. live-weight. The daily ration supplied 

 to lot I. originally contained 29'24 Ib. organic matter, and 

 that for lot II. 32'52 Ib. Water was supplied ad lib. to both 

 lots. 



It should be stated that at the end of a fortnight the 

 amount of hay per cow was reduced from 15 Ib. to 12 Ib. daily 

 in each case, it being found that the cows did not consume 

 the quantity originally allowed. The total organic matter 

 in the daily ration was thus reduced to 26'9 Ib. in the case 



