title: Growth and viability of Liaoning Cashmere goat hair follicles during the annual hair follicle cycle.
abstract: Here, we studied hair follicle development of Liaoning Cashmere goats. Every month for 1 year, skin samples were collected from five 1.5-year-old female goats, and made into paraffin sections. A number of parameters were measured of primary and secondary hair follicles via microscopic observation including follicle depth, hair bulb width, dermis and epidermis thickness, changes in follicle activity, and histology. The results showed the presence of three phases in the annual hair cycle: anagen, catagen, and telogen. Primary and secondary hair follicle depth varied across the months; however, no significant difference was obtained between adjacent months (P>0.05). Primary hair follicles had a bigger hair bulb width compared to secondary hair follicles; however, this difference declined during hair follicle developed in anagen. As hair follicle growth slowed, the hair bulb broadened, and hair root depth became shallower. During the entire hair cycle, hair follicle depth and dermis thickness were positively correlated; however, this relationship was not significant (P>0.05) for primary and secondary hair follicle density and the ratio of secondary hair follicle density and primary hair follicle density (S/P ratio). In addition, new and old primary hair follicles coexisted with secondary hair follicles. Finally, secondary hair follicles had a higher activity rate compared to primary hair follicle in adult Liaoning Cashmere goats in certain months.
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China.
authors.forename: Q L
authors.initials: QL
authors.lastname: Zhang
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Changchun, China.
authors.forename: J P
authors.initials: JP
authors.lastname: Li
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Changchun, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Changchun, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Chang
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Li
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Changchun, China.
authors.forename: J Y
authors.initials: JY
authors.lastname: Yao
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Changchun, China jianghz6806@126.com.
authors.forename: H Z
authors.initials: HZ
authors.lastname: Jiang
authors.affiliation: College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhao
authors.affiliation: Liaoning Cashmere Goat Breeding Center, Liaoyang, China.
authors.forename: D
authors.initials: D
authors.lastname: Guo
mesh_terms: D000818:Animals; D005260:Female; D006041:Goats / Q000145:classification / Q000502:physiology*; D018859:Hair Follicle / Q000254:growth & development* / Q000648:ultrastructure; D010507:Periodicity; D012867:Skin / Q000166:cytology* / Q000648:ultrastructure