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The conformation of the skin relief of soleal surface of the pulvinus digitalis distalis of the third digit (PDD III) was studied in two groups of one-day-old chicks. Besides, the length and width of PDD III and the width of the digital claw base were estimated in one group of chicks. These studies gave the following results: The soleal surface of PDD III has a corrugated relief resulting from the presence of small scales which do not overlap each other. The shape of scales depends on the localisation of scales on the pad; near its circumference elongated scales predominate while in its central part those of rounded and polygonal shape may be mostly found. Scales are arranged in 4 main and 2-3 accessory rows. The main rows are arched from the medial towards the lateral edge of the pad while the accessory ones are incomplete and situated between the main rows. The total numbers of scales on PDD III are the same on both legs and they are significantly higher in males than in females. The size of PDD Ill and the width of claw base show bilateral symmetry and are identical in both sexes.

The number of Digital Pad Scales - a New Sex Character in the Chick?