. La génétique en ce qui concerne l'agriculture. L'élevage ; l'hérédité ; Variation (biologie) ; l'amélioration des plantes. MENDELISM DCnrESTfC 475 TM d'animaux hybrides, pour les hybrides entre l'Hereford et bison blanc typique-face marlvings. L'If hybride entre les zébu et Hereford, cependant, a une face de couleur, comme le montre la Fig. 200. Le début de l'histoire de la race Hereford indique que les animaux à face tacheté n'étaient pas rares dans la fondation stock, et ils sont aujourd'hui rencontré souvent dans la Hereford bovins. Le motif caractéristique de Dutch Belted bétail apparaît, également, d'être une dominan

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. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. MENDELISM TM DCnrESTfC ANIMALS 475 hybrids, for hybrids between the Hereford and bison exhibit the typical white-face marlvings. The Fi hybrid between the zebu and Hereford, however, has a broken colored face, as shown in Fig. 200. The early history of the Hereford breed indicates that mottled-faced animals were not uncommon in the foundation stock, and today they are met with not infrequently in grade Hereford cattle. The characteristic pattern of Dutch belted cattle appears, also, to be a dominant character as con- trasted with self-coloration. Another color character, the black of. Fig. 190.—California Favorite, grand champion steer at 1916 International Livestoclc Exposition. Out of a red Shorthorn cow by a Hereford bull. The Hereford pattern ia completely dominant. {Photo from G. H. True.) Ayrshire cattle, exhibits sex-limited relations and will, therefore, be dis- cussed in another chapter. The polled character in cattle, as we have pointed out before, is clearly dominant to the horned condition, but the Fi may exhibit slight scurs. The breeding of cattle for the polled condi- tion is a simple problem in Mendelism involving a difference in a single pair of factors. The study of other characters in animals, particularly those which are of economic importance from a Mendelian standpoint, has just begun. Mendelism in Sheep.—As we have already noted the short-eared condition in sheep has been shown to be a simple dominant to the long- eared character. The factor for black wool in sheep is recessive, as Digitized by Microsoft®. 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 work.. Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]

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