FEED COST OE EGG PRODUCTION. 
9 
A study of Tables 4, 4a, 4b, and 4c, and the graphic representation 
in figure 2 shows a great variation in the proportions of the compo- 
nents of the mash consumed, especially in the corn meal and beef 
scrap. These percentages, if worked out on a weekly basis instead of 
for periods of four weeks, fail to show any constant relation between 
the percentage of either the corn meal or the beef scrap and the 
temperature or the egg production. The proportions of the grains 
seem to be influenced materially by the differences in years, or else 
by different lots of feed, especially beef scrap. This is shown in 
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Fig. 2.— Hens balancing their own ration. Percentage of corn meal and beef scrap consumed in mash. 
(Bran and middlings were before the hens also, but only small quantities were consumed.) 
the figure, where the curves for Pens 3 and 4 in 1913 are different 
from those in 1914, and the percentages in 1915 are very markedly 
different from those in either 1913 or 1914. 
The tendency to increase the percentage of corn meal and decrease 
that of beef scrap during the molting period is very uniformly marked 
in 1914 but is not so apparent in 1913. This is rather contrary to 
the practice of increasing the percentage of protein during the molt- 
ing period. The Leghorns ate a slightly larger proportion of beef 
scrap than did the general-purpose fowls, which difference was 
greater in 1913 than in 1914. The proportion of the grains eaten was 
93905°— Bull. 561—17 2 
