47° 



EVENING DISCOURSES 



drying and silage, and this has now been done for three complete years. 

 What has been done on the farm is shown in Figs. 6, 7, 8 and 9, which show 

 the amount of crude protein produced each month in various forms — 

 grazing, hay, dried grass and silage — and the amount of crude protein 

 consumed each month by the stock. These values have been found to be 

 of more interest than the weight of food produced and consumed. 



The amount of food obtained from a field by grazing has been calculated 

 back from the results achieved by the animal. Thus if a 1,000 lb. cow 

 had been maintained for one day, and had yielded four gallons of milk, we 



Consumption oF Gross etc. 1936 



(cm/t of Crude Protein per acre) 



Foods not derived 

 from qrass 



Hay 



Dried Grass 



Grazing 



^zzzrzz. 



SZZZZ3 



zzz 



00 



Jan. Feb Mar Apl May June July 



Fig. g. 



Sept Oct 



should conclude that the grass consumed had contained i6 lb. of starch 

 equivalent, and 3 lb. of protein equivalent, or 4-5 lb. of crude protein. 

 The cow must have had at least this quantity, and if it ate more the excess 

 must have been wasted. 



The foods not derived from grass consisted of roots, cereals and feeding 

 cakes. 



In 193s the average yield of crude protein per acre over the whole farm 

 was 595 lb. and in 1936 — which was a wetter year — was 680 lb., but as 

 we get more experience in managing the grassland we are learning each 

 year how to produce more food per acre. 



Let us compare the yields of protein and starch equivalent obtained by 

 various treatments from one acre of land. 



