412 



The journal of Heredity 



IMPORTED ABOU BEN ADAM HOMOZYGOUS RAM 

 This ram, elc\en years old at time of photograph, was used to produce the first generation 

 cross in the experiments to determine the inheritance of coat color and fur bearing qualities of 

 Karakul sheep when crossed with other breeds. "Out of ninety-two ewes and two years' lamb 

 croj) all the lambs except two were black." (Fig. 15.) 



M.-inu'd Pultava. The table on page 

 413 shows the results obtained from 

 this back cross. 



The ewe lambs yeaned in 1913 were 

 not bred back until 1915 so that more 

 individuals were used in the 1915 1 ack 

 cross than in 1914. 'I'he results show 

 an apparent contradiction to the first 

 cross; however, such is not really the 

 case. With our present knowledge of 

 Mendelism, these characters are ap- 

 apparenlly simple alleloiuor|)hs, and 

 therefore prove that the Pultava ram 

 was heterozygous (mixed ) for both the 

 color and fur factors. His blood has 

 since been discarded in the Dawley 

 (lock, '{'he selection and breeding f)f 



fur sheep in their native countr\' is not 

 always done as carefully as the Ameri- 

 can breeder could desire. Outcrosses 

 have, no doubt, been used which would 

 result in a heterozygous individual for 

 both the color and fur factor. Flock 

 books are not maintained and records 

 are imperfectly kept at best. This 

 accounts for the apparent contradic- 

 tion in the second cross. The results 

 of later crossing proved this con- 

 clusion of the mixed character of the 

 Pultava ram. 



In 1916, '17, 'IS, and '19 black ewes 

 were selected which showed desirable 

 curl, density and luster, they were 

 luated to Karakul rams of supposed 



