Identification of the Secondary Follicle Cycle of Hexi Cashmere Goat

Abstract

This experiment conducted to identify a periodic change of ultrastructures of secondary follicle characteristics during a whole year, reveal the molecule regulation of growth of cashmere. A total of 10 cashmere goats of 1-year old were studied. The paraffin section and ultrathin slices of skin were made each month in a whole year, observed, photographed, and analyzed under light microscope and transmission electron microscope after stained. Following the development of down fiber, the ultrastructures of secondary follicle of Hexi cashmere goat showed a periodic change within a year. There were five different periods during a down fiber cycle. It was observed that the stage of telogen, proanagen, anagen, procatagen, and catagen was in January and February, March and April, May to August, September and October, and November and December, respectively. The key change observed in secondary follicle under transmission electron microscope was inner root sheath. This study illustrated the five different stage of secondary follicle of Hexi Cashmere goat within a whole growth cycle, and has provided more detailed information about the research field of Hexi cashmere goat. Choosing the suitable time to harvest the cashmere may get the profit maximization. Anat Rec, 295:1520-1528,

Determination of Secondary Follicle Characteristics, Density, Activity, and Hoxc13 Expression Pattern of Hexi Cashmere Goats Breed

“…Henderson and Sabine () argued that the new SF came out beside the old SF. We affirmed their results under TEM (He et al, ). Researchers (Li et al, ) found that new SF firstly grows in group, and then separated into individual SF.…”

“…Furthermore, a better comprehension of skin biology and the factors that control the density and activity of follicle is required to breed the excellent species. We have reported that there were five different periods during a down fiber cycle and confirmed the specific time the five stages presented (He et al, ).…”

“…In this experiment, we observed the sacpic stained sections under light microscope and the ultrathin sections under TEM. It has been reported previously (Nixon, ; He et al, ) that the SF of Hexi Cashmere goat during the proanagen, anagen, and procatagen stages was in active state and during the catagen and telogen stages was in quiescent state. Sacpic staining is best for visual assessment of follicle activity because it accentuates the IRS, which accompanies a growing fiber (Nixon, ).…”

HOXC13 and HSP27 Expression in Skin and the Periodic Growth of Secondary Fiber Follicles from Longdong Cashmere Goats Raised in Different Production Systems

“…Cashmere is produced by secondary follicles (SF) in the skin of goats, and fiber production has been described in New Zealand cashmere goats, Liaoning cashmere goats, Mongolian cashmere goats, Iranian cashmere goats, Spanish cashmere goats, Gray goats and Hexi cashmere goats (Nixon et al, ; Li et al, ; Li et al, ; Ansari‐Renani et al, 2010a; Ansari‐Renani et al, 2010b; Wang et al, ; Dong et al, ; He et al, a,b). The SF show a periodic growth pattern, with defined periods called anagen, catagen, and telogen.…”

Identification of Genes Related to Hair Follicle Cycle Development in Inner Mongolia Cashmere Goat by WGCNA

“…Hair follicles enter the anagen and begin to grow rapidly. After entering the catagen phase, the hair balls begin to atrophy and become thinner, and gradually move upward; the hair follicles entering the telogen are only above the sebaceous glands, and the cells are in a static state ( 5 ). The periodic growth of cashmere goat hair follicles is regulated by a series of molecules, including hormone regulation, such as melatonin ( 6 ), prolactin ( 7 ), thyroxine ( 8 ), and so on.…”