Diaz Sandra F, Torres Sheila M F, Dunstan Robert W, Lekcharoensuk Chalermpol
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN 55108, USA.
Vet Dermatol. 2004 Feb;15(1):25-30. doi: 10.1111/j.1365-3164.2004.00356.x.
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. The objectives of this study 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.
人类、绵羊和实验用啮齿动物的毛发生长和替换已得到广泛研究，但关于犬类和其他哺乳动物的此类研究发表较少。本研究的目的是：（1）确定犬类在为手术而剪毛后毛发重新生长所需的时间；（2）确定一年中的季节是否会影响毛发重新生长所需的时间；以及（3）确定季节是否可能影响休止期与生长期的比例。在春季招募了11只拉布拉多寻回犬，夏季10只，秋季6只，冬季10只。当在春季、夏季、秋季和冬季剃毛后，毛发分别在14.6周、14.5周、13.6周和15.4周重新生长到剪毛前的长度。这些数值的差异不显著，表明季节对室内饲养的拉布拉多寻回犬的毛发重新生长速度没有影响（P = 0.12）。每个季节休止期与生长期比例的平均值分别为：5.2（春季）、6.1（夏季）、9.5（秋季）和5.3（冬季）。这些数值的差异也不显著（P = 0.89）。在所有四个季节中，处于休止期的毛发百分比均超过80%。
