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Hair-regrowth after clipping at various time of the year
Hair growth and replacement have been studied extensively in humans, sheep and laboratory rodents, but in dogs and other mammalian species few studies have been published. So this study evaluates the hair regrowth-time after clipping and potential seasonal influences in healthy indoor housed labrador retrievers.

The objectives of this study including eleven healthy labrador rettrievers were: (1) to determine the time required for the hair to re-grow in dogs after clipping for a surgical procedure; (2) to define whether the season of the year influenced the period of time required for re-growth and; (3) to determine if season might influence the telogen: anagen ratio.

Eleven Labrador retrievers were recruited during spring, 10 during summer, six during autumn and 10 during winter. Hairs re-grew to their preclipped length in 14.6 weeks, 14.5 weeks, 13.6 weeks and 15.4 weeks when shaved in the spring, summer, autumn and winter, respectively.

The differences in these values were not significant suggesting that season has no effect on the rate of hair re-growth in Labrador retrievers housed indoors (P = 0.12). The mean values for the telogen: anagen ratio in each season were: 5.2 (spring), 6.1 (summer), 9.5 (autumn), and 5.3 (winter).

The differences in these values also were not significant (P = 0.89). The percentage of hairs in telogen was over 80% in all four seasons.

Source: Diaz, Sandra F., Torres, Sheila M. F., Dunstan, Robert W. & Lekcharoensuk, Chalermpol (2004): An analysis of canine hair re-growth after clipping for a surgical procedure. In:
Veterinary Dermatology 15 (1), 25-30.




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