65 



EXPERIMENT G. 



This experiment was commenced on June 19, 1906, and 

 continued till September 12, a period of twelve weeks. 



Preliminary trials. These extended over one month. 

 The cows were dairy shorthorns of the usual type in the north 

 of England, all having calved from September to November, 

 1904. Each cow was tested for yield of milk and percentage 

 of butter-fat once a week. At the end of the period, the ten 

 most " regular " cows were selected, and divided into two lots 

 of five each, as far as possible according to the yield and 

 quality of their milk. When the experiment was commenced, 

 the two lots stood as follows : 



Average yield of milk Per cent, of Average 



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



Lot 1 34-0 pints 3'40 1,134 Ib. 



Lot II 33-4 pints 3'38 1,103 Ib. 



All the cows, were milked at 5 a.m., 12'30 p.m., and 6 p.m. 



Rations. With a view to showing the general effect on 

 the milk of concentrated food when consumed on grass, as 

 well as that of different quantities of the same food, the term 

 of the experiment was divided into two equal periods of six 

 weeks. As no satisfactory estimate could be made as to the 

 quantity of grass consumed by the cows, no attempt was made 

 to adopt any theoretical basis in fixing the rations supplied to 

 the lot receiving concentrated food. The two lots were fed 

 as follows : 



LOT I. 



FIRST PERIOD. 



2 Ib maize meal. 



2 Ib. Bombay cotton Cake. 

 2J Ib. straw chaff. 

 Grass. 



SECOND PERIOD. 



4 Ib. maize meal. 



4 Ib. Bombay cotton cake. 



3 Ib. straw chaff. 

 Grass. 



LOT II. 



Grass only. 



Grass only. 



