Hair Cycle in Dogs with Different Hair Types in a Tropical Region of Brazil

November 2007 in “ Veterinary dermatology ”

Evandro Silva Favarato, Lissandro Gonçalves Conceição

hair follicle activity telogen hairs anagen hairs hair cycle environmental temperature photoperiod

Studysummary This study observed that boxer and labrador dogs showed seasonal variations in hair follicle cycles linked to temperature and photoperiod, differing from schnauzers. Our plain-language summary of this paper — not a Tressless recommendation.

The study investigated the hair follicle activity of 21 male dogs from three breeds (Boxer, Labrador, and Schnauzer) in Viçosa, Brazil, over 12 months. It found that Boxers and Labradors had a higher percentage of telogen hairs during hotter months and more anagen hairs during colder months, with mean telogen percentages of 93% and 90%, respectively. This indicated a significant correlation between hair cycle and environmental temperature and photoperiod for these breeds. However, Schnauzers, with a mean telogen percentage of 55.3%, did not show significant seasonal variation in hair cycle phases. The study concluded that the hair cycle of Boxer and Labrador dogs is influenced by environmental factors in a tropical climate, unlike Schnauzers.

View this study on locus.ufv.br →

Discuss this study in the Community →

Research cited in this study

3 / 3 results

research An Analysis of Canine Hair Regrowth After Clipping for a Surgical Procedure

20 citations , February 2004 in “Veterinary dermatology”

This study found that the season of the year does not significantly affect the hair regrowth rate or the telogen: anagen ratio in indoor-housed Labrador retrievers.

research Exogen, Shedding Phase of the Hair Growth Cycle: Characterization of a Mouse Model

107 citations , September 2002 in “Journal of Investigative Dermatology”

This study identified a distinct "exogen" phase in the hair cycle during which hair shedding occurs, primarily coupled with the anagen phase, rather than as part of the telogen phase.

Prolactin Signaling Influences the Timing Mechanism of the Hair Follicle: Analysis of Hair Growth Cycles in Prolactin Receptor Knockout Mice

research Prolactin Signaling Influences the Timing Mechanism of the Hair Follicle: Analysis of Hair Growth Cycles in Prolactin Receptor Knockout Mice

73 citations , June 2001 in “Endocrinology”

In this study, researchers found that disrupting the PRL gene in mice led to earlier hair molting, especially in females, suggesting that PRL inhibits murine hair cycle events.