. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 32 BULLETIN 905, U. S. DEPARTMENT OF AGRICULTURE. It was thus very easy to fix the chestnut color in the Sussex Punch breed, but on the other hand, all other colors are dominant or, as is usually said, prepotent over it. The degree of prepotency depends on the dominant factors which are homozygous. A homozygous gray stallion (GG) will produce nothing but gray colts, however crossed. A heterozygous gray (Gg) will produce 50 per cent gray and 50 per cent not gray in crosses with mares which are not Fig. 7.—The spo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 32 BULLETIN 905, U. S. DEPARTMENT OF AGRICULTURE. It was thus very easy to fix the chestnut color in the Sussex Punch breed, but on the other hand, all other colors are dominant or, as is usually said, prepotent over it. The degree of prepotency depends on the dominant factors which are homozygous. A homozygous gray stallion (GG) will produce nothing but gray colts, however crossed. A heterozygous gray (Gg) will produce 50 per cent gray and 50 per cent not gray in crosses with mares which are not Fig. 7.—The spotted coat pattern of this scrub stallion is due to a dominant hereditary unit and may be expected to appear in half of his progeny. The curby hocks and other unsoundness are also strongly transmissible. COLORS OF HOGS. Curiously enough we know less about the mode of inheritance of colors in hogs than in the larger animals. The results of the first crosses between the various breeds are, however, well known. The white of Yorkshires and Chesters is more or less prepotent over the red of Tamworths and Duroc-Jerseys, and, probably for a wholly different reason, over the black of Hampshires, Berkshires, and Poland Chinas. The black of Hampshires is prepotent over the red of the red breeds. Berkshires and Poland Chinas, on the other hand, when mated with the red breeds, produce pigs with a tortoise- shell mixture of black, red, and often white spots. The white belt of Hampshires, like the white patterns of many other animals, is very irregular in its heredity. It is doubtful whether a given type of belt can ever be completely Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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