322 



PRINCIPLES OF FEEDING FARM ANIMALS 



were determined throughout the entire experiment. The 

 ration and the average percentages of the total nitrogen 

 and phosphorus contained in the ration which were excreted 

 in the manure (feces and urine) were as follows : 



Week 



1- 5 



8-13 

 17-22 

 25-37 



1-37 



Ration 



Clover hay, 1 part; corn, 1 part 

 Clover hay, 1 part ; corn, 3 parts , 

 CUover hay, 1 part ; corn, 5 parts , 

 Clover hay, 1 part ; corn, 4 parts 



linseed meal, 1 part . . 

 Average 



Percent N. Pehcent P. 

 Excreted Excreted 



During a digestion experiment at the IlHnois Experiment 

 Station 1 with six milch cows for 15 days, all of the nitrogen 

 of the ration was excreted, 80 per cent being in the dung 

 and urine and 20 per cent in the milk. Of the phosphorus 

 consumed, about 73 per cent was excreted in the feces and 

 urine, and 22 per cent in the milk. Of the potassium, 

 76 per cent was excreted in the feces and urine, and 14 per 

 cent in the milk. 



The Pennsylvania Station ^ ran a digestion experiment on 

 two milk cows for 50 days. Eighty-five per cent of the 

 nitrogen of the ration, 71 per cent of the phosphorus, and 

 91 per cent of the potassium were recovered in the manure. 



In experiments by Grindley and associates with pigs at 

 the Illinois Station ^ it was found that about 90 per cent of 

 the nitrogen of the ration is returned in the feces and urine. 



1 Unpublished data. 



2 Animal Report, 1899 19U0. 



3 Ihipublished data. 



