Abstract
THE problem of finding a quantitative expression for conformation or shape of birds is of considerable importance in breeding for improved market type. Selection can be practiced competently only when subjective criteria and standards of comparison are available, since visual evaluation of type is usually not adequate for an efficient breeding program. Jaap (1938a) has recently suggested the use of ratios of linear measurements to the cube root of body weight as indices of shape of turkeys. Extending this usage to chickens, Jaap and Penquite (1938) report that the ratios of shank length, keel length, body depth, and breast width to the cube root of body weight may be used to distinguish dressed poultry of different visual conformations. Similarly for turkeys, Jaap, Thompson, and Milby (1939) indicate that shank length, body depth, and keel length ratios may be used in selection for improved type.Any ratio or index devised may .
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