466 



Journal of Agricultural Research 



Vol. IV, No. s 



Table IX. — Average daily amounts of the different forms of phosphorus ingested by 



lambs 



[Results expressed in grams per day] 



The low values for total and for inorganic acid-soluble phosphorus with 

 lamb 468 are to be accounted for by his relatively low consumption of hay. 



The lot differences in the total phosphorus ingested were due primarily 

 to differences in the amounts of linseed meal in the rations offered, but 

 are affected also by the fact that the low-protein lot did not ingest as 

 much of the concentrates as the others, as is shown from the data of 

 Table II. 



The lot variations in the amount of acid-insoluble phosphorus ingested 

 were greater than in that of the total phosphorus. The amount of this 

 form of phosphorus ingested by the medium-protein lot was 192 per cent, 

 and by the high-protein lot 258 per cent of the amount ingested by the 

 low-protein lot. This large variation between the low- and medium- 

 protein lots was due mainly to a difference in the amount of concentrates 

 consumed and to the richness of the concentrates in this form of phos- 

 phorus, owing to its higher content of linseed meal. The main cause for 

 the difference between the amounts of acid-insoluble phosphorus ingested 

 by the medium- and high-protein lots was the fact that the acid-insoluble 

 phosphorus content of the concentrates differed considerably, the differ- 

 ence between the quantities of hay or concentrates consumed by the two 

 lots amounting to little. 



The amount of acid-soluble phosphorus ingested by the medium-protein 

 lot was 126 per cent and that by the high-protein lot was 132 per cent of 

 that of the low-protein lot. Since the acid-soluble phosphorus content 

 of the concentrates did not differ much, being for the low-, medium-, and 

 high-protein lots 0.141, 0.160, and 0.183 per cent, respectively, the dif- 

 ferences between the lots were due largely to the variation in the weights 

 of hay and concentrates consumed. 



