Rented from THE JOURNAL OF BIOLOGICAL CHEMISTRY, Vol. XXXIV, No. 1, 1918 



NdE ON THE RELATION OF BLOOD FAT TO SEX, 

 AND ON THE CORRELATION BETWEEN BLOOD 

 FAT AND EGG PRODUCTION IN THE 

 DOMESTIC FOWL. 



BY OSCAR RIDDLE AND J. ARTHUR HARRIS. 



(Fm the Station for Experimental Evolution, Carnegie Institution of 

 Washington, Cold Spring Harbor, New York.) 



(Received for publication, November 3, 1917.) 



i a recent number of this Journal Warner and Edmond 1 

 hsje presented a considerable series of determinations of the blood 

 fa 1 of White Leghorn hens and cocks. Their interesting dis- 

 ciiion of this subject requires a few words of comment on our 

 pat. 



ti the treatment of their data these authors have not sufficiently 

 poted out the bearing of their results upon earlier work, indeed 

 mst of the latter is ignored; the full value of their own work is 

 mi clearly brought out; and some conclusions unwarranted by 

 tlir data are drawn. The purpose of the paper is stated to be 

 &quot;1 show the relationship of blood fat of fowls to (1) egg produc- 

 tiji, (2) presence of food in the alimentary tract, (3) color of 

 .lep, etc., and (4) sex.&quot; 



&quot;he clear and outstanding fact to be found in the 94 blood fat 

 deerminations made by Warner and Edmond is that the blood 

 ofihe actively laying hen contains a very disproportionately large 

 anunt of fat; that of the non-laying hen a very disproportionately 

 sull amount of fat. This fact, however, (and others soon to be 

 mtitioned) for the blood serum of the fowl was published by 

 L^vrence and Riddle 2 2 months prior to the time that the samples 

 fcthe above mentioned 94 blood analyses were drawn for examina- 

 tii. This earlier work of Lawrence and Riddle on the blood of 



; Warner, D. E., and Edmond, H. D., J. Biol. Chem., 1917, xxxi, 281. 

 Lawrence, J. V., and Riddle, O., Am. J. PhysioL, 1916, xli, 430. 



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THE JOURNAL OF BIOLOGICAL CHEMISTRY, VOL. XXXIV, NO. 1 



