Constitutional Vigor in Poultry 



6ii 



PART V 

 A SUMMARY OF ALL FLOCKS 



The fifth part of this bulletin gives a summary of the combined data 

 of all the strong and weak pens in each experiment. 



All these data show a consistent advantage of the strong pens over 

 the weak. The few fluctuations among certain flocks did not affect the 

 final superiority of the strong flocks. The differences, however, were 

 somewhat less. 



FOOD CONSUMPTION AND EGG PRODUCTION 



The comparative number of pounds of food required to produce one 

 dozen eggs and the cost of food per one dozen eggs produced are shown 

 in Table 37 and in Figs. 168 and 169. In every comparison the strong 

 pens produced eggs at a less consumption of food. The true average 



TABLE 37. Amount of Food Required and Cost of Food for One Dozen Eggs 



(All experiments) 



Summer 

 selected 



Fall selected 



White 

 Leghorns 



Strong 



Weak 



White 

 Leghorns 



Qarred 



Plymouth 

 Rocks 



Strong I Weak 



Strong 



Weak 



True average 



Strong Weak 



Difference 



Strong Weak 



Pens. 



78-78- 

 20 



79-79- 

 22 



76-76- 75-75- 

 II 13 



21-21- 

 12 



23-23- 



14 



Pounds of food required 

 to produce i dozen eggs 



Cost of food per dozen 

 eggs 



7.82 

 $0. 117 



8.19 

 $0,123 



8.51 



9.13 



. 128, $0,137 



10.58 II. 12 

 $o.iss|.Jo.i65 



8.86 9.35 

 $0. 132 So. 140 



0.49 

 $0 . 008 



of all pens for all ^^^(^s - 



experiments shows ^^'^(!f-7s-78-zo 



that the strong flocks We?f/(-T9-79-z2 



used 8.86 pounds of 6rrono-7e,-7i,-/i 



food to produce each ive^rk-7s- 75-/3 

 dozen eggs, as com- 

 pared with 9.35 pounds ^ 



required by the weak ^/^^^-^3-25/^ 



flocks, a difference of 5Pion^-True />>/'- 



0.49 pound in favor of ma/f-True A/.- 



tne strong nocKS. 1 ne Y\g. 168. — The amount of food required to produce one dozen 

 cost of producing eggs eggs. All experiments 



