G4 



OFFERTON BULLETIN No. 2. 



Experiments on the Feeding of Dairy 



Cows. 



Second Report, published January, 1907. 



BY C. BRYKER JONES. 



THE FEEDING OF CONCENTRATED FOOD ON 



PASTURE. 



Object. The object of the present experiments was to 

 determine the effect of a supply of concentrated food upon 

 the quantity and quality of milk during the summer months 

 when cows are on pasture. The results of feeding experi- 

 ments previously carried out at Offerton indicated clearly 

 that to increase the actual weight of food given to cows, 

 provided they already receive a sufficient allowance to main- 

 tain their condition, does not result, except temporarily, in a 

 corresponding improvement in the yield and quality of the 

 milk. This point having been demonstrated with cows fed 

 indoors during the winter, it might be inquired to what 

 extent it is advantageous to use additional food on grass 

 during the summer. 



Sampling and testing. In the preliminary trials, the 

 cows were tested individually at weekly intervals. In all the 

 experiments, as on previous occasions, the mixed milk of each 

 lot of cows was sampled daily, morning, noon, and evening. 

 The total milk of each lot was weighed at each milking, and 

 the quantity recorded. The butter-fat in each sample was 

 estimated by means of a Gerber acid-butyrometer, and the 

 " solids not fat " calculated from the usual data. 



