LNLSLAL KESLLT OF A BERKSHIRE X DUROC JERSEY CROSS 



Crossbred sow born at Fennsylvania State College in 19 1 5 from mating of Berkshire sow and 

 Duroc Jersey boar. The usual result of this cross is a red pig with black spots, but this 

 animal is blai'k instead of red, with white spots or blotches. While she did not show any 

 red, she carried it in her germ-plasm, for when she was mated to a Berlcshire boar she 

 farrowed nine pigs, eight of whom had som.e red hair. (Fig. 17.) 



The litter from the cross-l)red sow- 

 No. I (l)lack and white) when mated 

 with a Berkshire boar showed j^Teater 

 variation than the table indicates. 

 The white hair on this sow during the 

 late summer of 1915 became yellowish 

 which is usual in white swine, but in 

 the winter appeared pure white. How- 

 ever, at about one year of age a light 

 reddish streak aijpeared between the 

 ears and extended over the dorsal region 

 of the neck or 4 for 5 inches. 



In her litter, the five pigs designated 

 as l:)lack and white, only one could be 

 described as being pure black with 

 white spots. The other four possessed 

 sandy-colored hair (reddish tint) about 

 the snout. Only one pig was red and 

 black, and in this case the black pre- 

 dominated over the Ixjdy with sjjots of 

 red hair. The i^redominance of black 

 over red in the Fi generation has never 

 been observed Vjy the writer in the Fi 

 generation of a Berkshire Duroc Jersey 

 cross. The usual color marking of the 

 Fi generation did not appear in the 

 second generation when sow No. 1 was 



380 



mated to a Berkshire boar. One pig 

 was a bright brownish yellow and pie- 

 bald black. Two pigs showed the 

 three colors black, red and white dis- 

 tinctly. One of these tri-colored pigs 

 possessed a black body with irregular 

 spots of red and white. The other pig 

 possessed five longitudinal stripes of 

 reddish hair on a black body spotted 

 with white hair. This last case is in- 

 teresting because the young of the 

 "wild boar" are marked with longi- 

 tudinal body stripes. This setms to 

 be an exception to the statement made 

 by Castle:''' "This banded character 

 of both young and adult has a])parently 

 been lost in all domestic breeds [swine] 

 which are either self black, red or white 

 or else black or red spotted with white." 

 The only ex])lanation of these longi- 

 tudinal body stripes seems to be that 

 their hereditary determiners have not 

 been entirely eliminated from improved 

 breeds of swine. 



Due to the fact that eight out of the 

 nine pigs in the litter from cross bred 

 sow No. 1 showed red or traces of red 



