Aug. i6, 1915 



Phosphorus Metabolism of Lambs 



465 



PHOSPHORUS OF THE RATIONS 



PHOSPHORUS conte;nt of the; feeds offered 



The percentages of the different forms of phosphorus found in the 

 different feeds of the rations are stated in Table VIII. 



Table VIII. — Different forms of phosphorus in the feeds of lambs 

 [Results expressed in percentage of the fresh substance] 



Feed. 



Alfalfa hay. .. 



Com 



Linseed meal 



Total phos- 

 phorus. 



3. 216 

 . 269 



Acid- 

 insoluble 

 phosphorus. 



058 

 652 



Acid-soluble phosphorus. 



Total. 



o. 158 



. 229 



Inorganic. Organic 



O. 149 

 .031 



. 127 



o. 009 



• 105 



. 102 



It is significant that, while the corn had 1.25 times as much total 

 phosphorus as the alfalfa hay, the linseed meal had 4.07 times as much 

 as the hay; also that the com had 2.30 times as much acid-insoluble 

 phosphorus as the hay, and the linseed meal had 11.23 times as much. 

 The linseed meal had a much higher content of total phosphorus than 

 either the hay or the com, and this increased phosphorus was largely in 

 the acid-insoluble form. Neither the com nor the linseed meal had as 

 high content of inorganic acid-soluble phosphorus as the hay. 



Since the gradations in protein given to the three lots were made by 

 increasing the amount of linseed meal in relation to com and since the 

 linseed meal was richer than the corn in total phosphorus, in acid- 

 insoluble phosphorus, and in organic acid-soluble phosphorus, while the 

 two concentrates were practically identical in organic acid-soluble 

 phosphorus, it is evident that the high-protein lot received concentrates 

 which were richer in all forms of phosphorus with the exception of the 

 organic acid-soluble form than w^ere those received by the medium- 

 protein lot. The same was true of the medium-protein lot relative to 

 the low-protein lot, but the three lots were offered practically the same 

 quantities of organic acid-soluble phosphorus. 



amounts of phosphorus ingested 



The average daily quantities of the different forms of phosphorus 

 ingested by each lamb as calculated from the weights and analyses of the 

 feeds and the orts are given in Table IX. 



