Constitutional Vigor in Poultry 



609 



The same relative comparison between the strong and weak flocks 

 holds with the value of eggs produced and the balance profit, as shown 

 in Table 35. In the two years the average strong fowl made a balance 

 profit nearly fourteen cents more than that of the average weak fowl. 

 An exception is noticeable here, also, in that the weak Barred Plymouth 

 Rock flock netted a higher balance profit than the strong flock. This 



TABLE 35. Financial Statement per Hen 

 (True average for two years) 



exceptional result is due to the unaccountably heavy mortality in the 

 strong flock, since the total income from eggs and gain in flesh was greater 

 in the strong than in the weak flock. This greater average profit of 

 fourteen cents per hen for all the strong flocks is due to the marked 

 superiority of the strong White Leghorn flocks over the weak ones. 

 The fall-selected White Leghorn flocks show a difference amounting to 

 40.7 cents in favor of the strong. 



MORTALITY 



In Fig. 167 it is 

 shown that the mor- 

 tality was high in all 

 but one strong pen. 

 These figures represent 

 the total mortality for 

 both years and not the 

 average mortality. In 

 one instance, a weak 

 flock suffered less mor- 

 tality than did the cor- 

 responding strong 



^erce/7jjg(Z — Z 4 e & 101? /^IG/6Z0iZZ4Z(>Z8i03Z3^5(> 

 ^rro/7^ 78'78\ 



l/l/ec7M 79-79 

 3Tror7g 76-76 



i¥ec?/< 7S-7S 



strongs I -zi 



strong- Av- 

 ^ecfk - Av.- 

 FiG. 167. — The percentage of niortalify. Total for two years 



