Aug. i6, 1915 



Phosphorus Metabolism of Lambs 



467 



The amount of inorganic acid-soluble phosphorus ingested by the 

 medium-protein lot was 126 per cent and the amount ingested by the 

 high-protein lot was 139 per cent of the amount ingested by the low- 

 protein lot. The causes of this variation were the same as those for the 

 total phosphorus. 



The lot average of the organic acid-soluble phosphorus for the medium- 

 protein lot was 127 per cent and that for the high-protein lot w^as 119 

 per cent of the lot average for the low-protein lot. The cause for the 

 difference between the low- and medium-protein lots is traceable to both 

 the amount of the feeds ingested and their richness in this form of phos- 

 phorus. The medium-protein lot exceeded the low-protein lot in the 

 consumption of both hay and concentrates, but mainly concentrates; 

 and the hay contained only 0.009 per cent of this form of phosphorus, 

 while the concentrates fed to both the low-protein and the medium- 

 protein lots contained 0.105 per cent. The difference between the 

 organic acid-soluble phosphorus for the medium- and the high-protein 

 lots was due chiefly to a difference in the amount of concentrates con- 

 sumed. This is clear when it is noted that the average consumption for 

 the medium-protein lot was 693.8 gm. of alfalfa hay and 789.3 gm. of 

 concentrates, while that for the high-protein lot was 697.3 g^- of hay, 

 and 741.4 gm. of concentrates, the medium-protein lot exceeding the 

 high-protein lot in the consumption of concentrates. The organic acid- 

 soluble phosphorus content of the concentrates fed the two lots also had 

 a small influence. 



The percentage distribution of the ingested phosphorus among the 

 different kinds is recorded in Table X. It will be noted that the relative 

 amounts of the four different forms of phosphorus ingested by the three 

 lots of lambs varied decidedly. 



Table X. — Relative amounts of the different forms of phosphorus ingested by lambs 

 [Results expressed in percentage cf the total phosphorus ingested] 



