COLOR IN THE AMERICAN HARNESS HOR- 2OQ 



It seems to me that we have here sufficient proof that H ur- 

 inal -uppo-ition is right that the dominant character i- the 

 Mack in the coat. However his idea that the Mark, it" pre-ent. 

 - '.n ili,- tVt locks, seems to me to be unjustified, as Joe 

 I 1 t< IK n. a h- gous Mack, has white feet, though the.- white 



do,-- not n-ach as far up as the fetlock on the left hind one. 

 ('rattan, anotlu-r heterozygous black, also has three white fet- 

 1"< k-. It i- not at all rare to see pictures of bays or ln>\\n- 

 \\ith one foot or more white as far up as the fetlock or further. 

 II-! amples: bays Capo, both hinds; Moko, 



i hind: Aii" l.eyburn, left hind; Allerworthy, both left>; 

 Hail ('loud. riv;lit front; browns Rcdlac, both hind-: The 

 II lett hind; Searchlight, both hinds. At lea-t on. 



the-. Moko is : lozygous. 



In th< the next factor, bay, a complication arises in 



nl to l>ro\\n. A- explained lx.-fore the presence of Ui\ i- 



dominant e, and the color next below it in tin -cale 



i- Mai k. l'.r>.\\: T lctwei-n these two, shading into both 



\i ' brown is usually a heterozygous color, 



I 'lit that bay also is quite often het i 

 uid that l'io\\n may occasionally be either of the homo/v- 



i- I\|H--.( 1 1 /l /> or t 'I I fib. This suggests the idea that the line 

 Ixtuieii Mack and bay should l>e drawn somewhere near the 

 black limit ot l.n.un. The obvious result of this complication 

 i- the creation ol considerable confusion in the numerical propor- 

 tion- of the t\\o (uli.r-.. It is evident that, except for this com- 

 plication and the appearance of some chestnuts, bay will acl 

 as ihou-h it \\ere an ordinary dominant to black. 



I'.. l..\\ i- a taMe -Imwing twelve sires homozygous for the l>a\ 

 factor. >i\ of them are bays, and one is the only brown certainly 

 kiio\\M to In- homo/\ gous for this factor. Two are ihe-tnuts, 

 and therefore la. k Hurst's factor. The other three are a K'"- I >' 

 and t \\o roan-, and it \\ ill IK? noted that all three of them appeared 

 in the taMe of -ires homozygous for HurstV factor. They arc- 

 not l.a\- Ucaii-c they also bear other fa I -hall explain 

 later, uf the bays two are homozygous and four are heten>/y- 

 gousfor H in -t'- factor. The single black from KoU-n Mc(',r. 

 i- l>oM.\ Good, pacer, 2:II 1 4 , out of a daughter of A-hland 



Wilkes. 



