OllIGIN or riiOs^i'HUitl S CUMl'Or.ND.s I.N HENS' EGGS 



275 



Acid-solubie Phosphorus in Plasma 



? — -<r — f 



60 90 120 150 180 210 310 34u 370 



Age of the chicken m days 



Fig. J. Pliospliorus distribution in chicken blood. 



were oljlained by analysing the blood of a large number of white Leghorn 

 ehickens. The analyses were repeated once a month or oftener beginning 

 at the time when the chickens were 1 month old and continuing through 

 1he periods of growth, egg production, and subsequent molting. The 

 results present very instructing data, they show that the phosphatide 

 phosphorus alone, especially that of the plasma, changes very markedly 

 with the age of the chicken, a rapid rise in the latter taking place after 

 the lapse of 5 months at the time of produ(^tion, this high level being 

 held under the entire production period with some fluctuations and 

 dropping quickly as production ceases and molting season approaches. 



18* 



