40 



BULLETIN 561, IT. S. DEPARTMENT OF AGRICULTURE. 



Digestible protein, energy values, and total dry matter of the 

 feedstuffs, as given in Department of Agriculture Bulletin No. 459, 

 are shown in Table 14. These values are those worked out for farm 

 animals; no figures of this kind are available in poultry feeding. 

 Detailed figures showing the energy values of the rations used are 

 given in Table 15, based on the assumption that these figures apply 

 more or less accurately to poultry. 



Table 14. — Average dry matter, digestible true, protein, and net energy values in 100 

 pounds of various poultry feeds. 



Feed. 



Dry 



matter. 



Digestible 

 protein. 



Net 

 energy. 



Feed. 



Dry 



matter. 



Digestible 

 protein. 



Net 

 energy. 



Wheat 



Pounds. 

 89.8 

 90.8 

 89.5 

 90.7 

 88.7 



Pounds. 

 8.1 

 8.7 

 7.0 

 8.3 

 6.4 



Therms.i 

 91.82 

 67.56 

 89.16 

 89.94 

 88.75 



Wheat bran 



Wheat middlings... 



Pounds. 

 89.9 

 89.6 

 92.5 

 92.5 



Pounds. 

 10.8 

 12.0 

 45.5 

 35.4 



Thcrms. 1 

 53.00 





59.10 





72.96 





Cottonseed meal 



93.46 











i A therm is the quantity of heat required to raise the temperature of 1,000 kilograms (2.204.6 pounds) of 

 water 1° C. It is equal to' 1,000 large, or kilogram, calories. 



Table 15. — Dry matter, digestible protein, and energy values in 100 pounds of feed con- 

 sumed. 



Pen. 



Year. 



Dry 



matter 



Digests 



ible 

 protein. 



Net 

 energy. 



Pen. 



Year. 



Dry 



matter. 



Digest- 

 ible 

 protein. 



Net 

 energy. 







Pounds. 



Pounds. 



Therms. 







Pounds. 



Pounds. 



Therms. 



1 



1913 



90.0 



11.70 



77.77 



7 



1914 



89.9 



11.58 



S2.36 





1914 



90.2 



12.66 



76.50 





1915 



89.6 



9.35 



84.56 





1915 



90.0 



13.86 



74.82 























8 



1914 



90.0 



11.90 



82.50 



2 



1913 

 1914 



89.6 



89.8 



10.17 

 12.22 



85.04 

 81. 25 





1915 



89.8 



12.31 



82.38 





1915 



89.8 



13.46 



78.57 



9 



1914 

 1915 



89.8 

 89.4 



8.46 

 8.39 



78.64 

 77.61 



3 



1913 



89.9 



10.33 



81.66 















1914 



89.8 



10.90 



S2. 16 



10 



1915 



90.1 



11.88 



79.77 





1915 



89.5 



8.88 



S3. 83 























11 



1915 



90.1 



12.46 



79.50 



4 



1913 



89.7 



11.06 



82.39 















1914 



89.9 



11.26 



82.38 



12 



1915 



89.8 



12.61 



82.34 





1915 



89.4 



8.24 



S4. 64 























14 



1915 



S9.9 



12.45 



77.25 



5 



1913 



89.8 



10.66 



81.58 















1914 



89.8 



11.52 



81.26 



1.5 



1915 



90.2 



12.46 



79.34 





1915 



89.8 



11.78 



81.06 























16 



1915 



90.2 



10.97 



80.68 



6 



1913 

 1914 

 1915 



90.4 

 90.3 

 90.1 



11.31 

 11.16 

 9.91 



82.81 

 81.77 

 81.67 













SUMMARY. 



This bulletin shows the results obtained in feeding experiments 

 covering 3 years' work. In the third year 16 pens were under obser- 

 vation, containing a total of 366 laying hens. 



The average egg yield for the first laying year in all pens was 131 

 eggs, and the highest pen average yield was 169.5 eggs. In the 

 second year the average egg yield of all pens was 92.7 eggs, which 

 decreased to 78.2 eggs in the third laying j 7 ear. 



