TLDR Fasting in hens affects thyroid hormones, which regulate feather and hair growth.
This study investigates the molecular mechanisms behind feather and hair follicle growth during fasting-induced molting in late-stage egg-laying hens. By using hematoxylin-eosin staining, hormone assays, and RNA sequencing, the researchers identified key genes (DSP, CDH1, PKP1, PPCKB) and pathways involved in this process. Significant changes in thyroid hormones (triiodothyronine and tetraiodothyronine) and calcium content were observed during feather shedding and regrowth. The study highlights the role of thyroid hormone synthesis, calcium signaling, and thyroid hormone signaling pathways in regulating feather molting, providing valuable insights into the cyclical growth of hair follicles during induced molting.
5 citations
,
January 2022 in “Scientific reports” The research identified two types of keratinocytes in chicken scales: one for hard scales and another for soft skin, with similarities to human skin differentiation.
4 citations
,
January 2020 in “Frontiers in Physiology” Good feather growth in poultry needs the right balance of proteins, amino acids, minerals, and vitamins.
45 citations
,
October 2015 in “BMC Genomics” Chicken feather growth involves specific genes and shares similarities with hair development.
June 2025 in “Clinical Cosmetic and Investigational Dermatology” Gray hair can potentially be managed or reversed with treatments that boost melanin production and address nutritional deficiencies.
November 2020 in “IntechOpen eBooks” Not getting enough minerals can lead to health problems and shorter lifespans.
October 2022 in “Southeast Asian journal of health professionals” Hair greying is seen as a sign of aging; temporary fixes like hair dye are used, but a balanced diet and hair care can help manage it.
Premature graying of hair is linked to vitamin D and B12 deficiencies, thyroid issues, iron imbalance, stress, and lifestyle habits, and affects quality of life.
7 citations
,
March 2021 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Blocking prolactin increases the activity of secondary hair follicles in cashmere goats.
