THE BREEDING OF CHICKENS 111 



the percentage given in the table directly represent anything 

 of the hereditary constitution of the individual. After that 

 there will be great variability in the characteristics trans- 

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

 numerous progeny will the percentages hold true. 



In Figure 45, " Standard l)lood" is re])resented l)y 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 

 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 "mongrel blood." 



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

 the chances of the appearance of the mongrel character- 

 istics in the fifth generation, as shown at "K," would be .31 out 

 of 100, and the chances in the following generation not indi- 

 cated in the chart would be IjTy out of 100. In the early 

 history of many of the pure breeds of live stock the sixth and 

 seventh cross, as here shown, were admitted for registry. 



LEGENDS FOR FIGURES 46, 47, 4S AND 49. 



Fig. 4G. — Mongrel hens, mothers of puhets sho^\"n in Figure 47, ]>y a 

 S. C. W. Leghorn sire. Egg lecords and lines of descent are shown in 

 Table X\\ (Courtesy of Kansas Agricultural Experiment Station.) 



Fig. 47 — First generation of S. C. W. Leghorn grades. Daughters of 

 mongrels shown in Figure 46 by a S. C \V. Leghorn sire. Mothers of 

 pullets shown in Figure 48 by a S C. \\\ Leghr)rn sire. Lines of descent 

 and egg records are shown in Table X^'. (Cointes\' of Kansas Agricultural 

 L^.\periment Station.) 



Fig. 48. — Second generation of S. C. W. Leglujrn grades. Daughters 

 of females shown in Figure 47 by a S. C. W. Leghorn sire. Mothers of 

 pullets shown in Figure 49 by a S. C. W. Leghorn sire. Lines of descent 

 and egg records shown in Table XV. (Courtesy of Kansas Agricultural 

 Experiment Station.) 



Fig. 49. — Third generation of S. C. W. Leghorn grades. Daughters 

 of females shown in Figure 48 by a S. C. W. Leghorn sire. Lines of descent 

 and egg records are shown in Table XV. (Courtesy of Kansas Agricultural 

 Experiment Station.) 



