468 



Journal of Agricultural Research 



Vol. IV, No. s 



RELATIONS BETWEEN THE PERCENTAGE OF PHOSPHORUS AND OF 

 PROTEIN IN THE FEEDS 



Attention has been called to the fact that, while the rations were 

 primarily planned to furnish marked differences in the protein received 

 by the different groups of animals, such differences in the protein were 

 necessarily accompanied by corresponding differences in the amounts 

 and kinds of phosphorus received. The percentages of protein and 

 phosphorus and the ratios of phosphorus to protein in the several feeds 

 offered and in the concentrates of the different lots are given in Table XI. 



Table XI. — Phosphorus and protein content of the feeds compared 



Feed. 



Alfalfa hay 



Corn 



Linseed meal 



Concentrates of Lot I . . 

 Concentrates of Lot II. 

 Concentrates of Lot III 



Phosphorus. 



Per cent. 

 O. 2l6 

 . 269 

 .881 

 .300 

 . 422 

 •575 



Protem. 



Per cent. 



12. 50 

 6.89 



31-79 

 8. 14 



13. 12 



19-34 



Ratio of 

 phosphorus 

 to protein. 



57-9 

 25.6 

 36. I 

 27. I 

 31- I 

 33-6 



It is evident from the data given in Table XI that there are marked 

 differences between the ratios of phosphorus to protein in alfalfa hay, 

 corn, and linseed meal. On the other hand, the ratios between the phos- 

 phorus and protein in the concentrates fed Lots I, II, and III are not 

 markedly dissimilar. 



PHOSPHORUS IN THE FECES AND URINE 



PHOSPHORUS CONTENT OF THE FECES 



The percentages of the different forms of phosphorus found in the 

 feces are given in Table XII. The average daily excretion of the differ- 

 ent forms of phosphorus in the feces and of the total phosphorus in the 

 urines is given in Table XIII. 



