Influence of Extended Photoperiod Using Blue Light Masks on Hypertrichosis, Coat Condition, and General Health Parameters in Horses with Pituitary Pars Intermedia Dysfunction

October 2025 in “ Animals ”

Sinead Parmantier, Panoraia Kyriazopoulou, Margaret McClendon, Amanda Adams, Barbara A. Murphy

blue light masks hypertrichosis pituitary pars intermedia dysfunction PPID photoperiod coat condition hair length shedding blue light therapy

TLDR Blue light masks improved coat condition and energy in horses with PPID.

The study investigated the effects of extended photoperiod using blue light masks on 52 horses with pituitary pars intermedia dysfunction (PPID) and hypertrichosis. Group T (29 horses) wore light masks, while group C1 (23 horses) and an unmedicated group C2 (17 horses) remained under natural photoperiod. Over 13 months, hair length, shedding, and body condition were monitored. Results showed that group T experienced advanced shedding, improved coat condition, decreased fat coverage, and increased energy. Improvements in coat condition, PPID clinical signs, and quality of life were noted in group T, suggesting that blue light treatment could be a beneficial complementary therapy for PPID.

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