. Poultry production. Poultry. BREEDING 127 Cross-breeding.—Two kinds of cross-breeding are practised. With the first, which is used in endeavoring to find a new combination of characters or qualities and thus form a new breed, individuals of different Ipreeds whose blended characters it is hoped will approach the combination sought are mated and selected progeny of the cross are used as breeders for further operations. An illustration of this is found in the formation of the American breeds. Fig. 63. A cross-bred hen carrjring three-eighths Barred Plymouth Rock blood and five-eighths Single C
. Poultry production. Poultry. BREEDING 127 Cross-breeding.—Two kinds of cross-breeding are practised. With the first, which is used in endeavoring to find a new combination of characters or qualities and thus form a new breed, individuals of different Ipreeds whose blended characters it is hoped will approach the combination sought are mated and selected progeny of the cross are used as breeders for further operations. An illustration of this is found in the formation of the American breeds. Fig. 63. A cross-bred hen carrjring three-eighths Barred Plymouth Rock blood and five-eighths Single Comb White Leghorn. Egg record, 291 in twelve months. (Courtesy of Oregon Experiment Station.) With the second the two breeds are kept in their purity, and the progeny, which always represent a first cross, are never used for breeding purposes. Thus it is said that for producing Philadelphia capons a cross much employed is that of the Light Brahma and White Plymouth Rock. The offspring always carry half their blood from each breed. For producing market ducks a cross much used is that of the Pekjn and Aylesbury. In such breeding it should always. 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 Lippincott, William Adams, 1882-1931. Philadelphia, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectpoultry
