Constitutional Vigor in Poultry 589 



more than offset by the manure taken from them. The labor involved 

 in keeping records was so greatly in excess of what it would be on a 

 commercial plant that it was omitted from this summary. 



In Table 11 the balance profit from each of the strong pens is shown 

 to be materially greater than that from the corresponding weak pen. This 

 difference is most pronounced in the fall-selected White Leghorn pens. 

 Although the weak pen (79) laid more eggs than the strong pen (78), 

 the difference in consumption of food and the cost of lost stock brought 

 the average profit of flock 79 sixteen cents lower than that of flock 78. 

 The difference in balance profit between the averages of the strong and 

 weak pens was thirty-nine cents in favor of the strong pens. 



