Diao Xiaogao, Yao Lingyun, Wang Xinhui, Li Sen, Qin Jiaxin, Yang Lu, He Liwen, Zhang Wei
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, China Agricultural University, No. 2, Yuan Ming Yuan West Road, Beijing 100193, China.
Animals (Basel). 2023 Feb 9;13(4):617. doi: 10.3390/ani13040617.
The objectives of this trial were to study the growth and development of hair follicles and cashmere traits in cashmere goats and to provide a theoretical basis for the regulation of secondary hair follicle development and the scientific breeding selection of cashmere goats. Twelve single-fetal female kids were selected as research objects. A long-term tracking plan was created to regularly determine their growth performance, cashmere performance, and hair follicle traits. The results showed no significant difference in live weight after the first and second combing. The cashmere yield and unit yield of the first combing were significantly higher than those of the second combing ( < 0.05). Sections of hair follicles showed that the primary hair follicles are almost fully developed by 1 month, and the secondary hair follicles are fully developed by 5-6 months after birth. The primary hair follicle density (PFD) and secondary hair follicle density (SFD) were highest at birth and decreased within 1 month; and SFD was stable at 5-6 months of age. The change of MSFD took a maximum time of 2 to 3 months. The S:P increase reached its peak at 6 months. 4 expression increased with time. , and were higher at 3 months old than at the other two-time points. In conclusion, this study determined the total development time of primary and secondary hair follicles from morphology and speculated that , , and may play a regulatory role in developing secondary hair follicles. Therefore, the period from birth to 6 months of age was the best time to regulate secondary hair follicle development in cashmere goats kids. The traits of the hair follicle and cashmere at 6 months of age could be breeding selection indicators for cashmere goats.
本试验旨在研究绒山羊毛囊的生长发育及羊绒性状，为调控次级毛囊发育和绒山羊的科学选育提供理论依据。选取12只单胎雌性羔羊作为研究对象，制定长期跟踪计划，定期测定其生长性能、羊绒性能和毛囊性状。结果表明，第一次和第二次梳绒后的体重无显著差异。第一次梳绒的羊绒产量和单位产量显著高于第二次梳绒（<0.05）。毛囊切片显示，初级毛囊在出生后1个月时几乎完全发育，次级毛囊在出生后5-6个月时完全发育。初级毛囊密度（PFD）和次级毛囊密度（SFD）在出生时最高，在1个月内下降；SFD在5-6月龄时稳定。MSFD的变化最长需要2至3个月。S:P比值在6个月时达到峰值。4表达随时间增加。在3月龄时高于其他两个时间点。综上所述，本研究从形态学上确定了初级和次级毛囊的总发育时间，并推测，，和可能在次级毛囊发育中起调节作用。因此，出生至6月龄是调控绒山羊羔羊次级毛囊发育的最佳时期。6月龄时的毛囊和羊绒性状可作为绒山羊选育的指标。
