114 POULTRY PRODUCTION 



mitted by the females and only in the terms of averages of 

 numerous progeny will the percentages hold true. 



In Fig. 51, "standard blood" is represented by black and 

 "mongrel blood" by a mixture of lacing, white, stippling, and 

 barring in the various circles. Thus the circle "A" repre- 

 sents a bird that carries 100 per cent, "pure blood" and the 

 circle "B" 100 per cent, "mongrel blood," or a mixture of 

 laced, white, stippled, and barred varieties. From the nature 



Fig. 51 



100.<ifc''"2!,^''^'> GRADING CHART „on3REL^ 



^^""S^ 



\ 



\. 



GENERATIONS 

 -^ >4 C y OFF-3PniNG 



lOO^^B 50^ ^P 50^ 1ST 



100,"^ A 7G^^a5ji 2ND 



10or^M| 7 |^12Va ^ 3R0 



100^J^M^6'A;< 4TH 



86 V. ;« •F'''' ^ ' : »™ 



K 



of the case, "A" represents a male and "B" a group of 

 females. When mated together the offspring shown at "C" 

 will carry 50 per cent, each of standard and of mongrel 

 blood. If females from' group "C" are now mated with 

 another "standard" bred male, "D," the offspring, "E," 

 will on the average carry 75 per cent, "standard blood" and 

 25 per cent, "jnongrel blood." 

 By using standard-bred males as indicated in the chart, 



