China Animal Husbandry & Veterinary Medicine ›› 2025, Vol. 52 ›› Issue (6): 2705-2716.doi: 10.16431/j.cnki.1671-7236.2025.06.023

• Genetics and Breeding • Previous Articles    

Effects of Photoperiod Regulation on Fleece-related Hormones in Different Color Cashmere Goats

YI Leqi1,2, LIU Junyang2,3, XU Fuxun4, WU Tiecheng2, WANG Tao2, SUN Xuefeng5, CHAO Lumeng4, Alamusi5, GAO Yulin2, LIU Bin2   

  1. 1. Inner Mongolia Minzu University, Tongliao 028000, China;
    2. Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China;
    3. National and Local Joint Engineering Research Center for Evaluation and Breeding Technology of Meat Sheep Genetic Resources (Mongolia), Hohhot 010031, China;
    4. Bayannur Institute of Agriculture and Animal Husbandry Sciences, Bayannur 015001, China;
    5. Urat Zhongqi Animal Husbandry and Aquatic Products Service Center, Bayannur 015399, China
  • Received:2024-09-29 Published:2025-05-27

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Abstract: 【Objective】 This study was aimed to investigate the effects of photoperiod regulation on fleece-related hormones in different color cashmere goats,so as to optimize breeding strategies for various types of cashmere goats and improve the production efficiency and quality of cashmere.【Method】 A total of 64 adult female cashmere goats,aged 2 years and of different coat colors (red goats (n=24),white goats (n=30) and black goats (n=10)),were randomly divided into two groups:Experimental group (short photoperiod,09:00-17:00) and control group (natural photoperiod).Blood samples were collected during different growth phases of the secondary hair follicles (telogen,early anagen,anagen and catagen phases).The concentrations of seven hormones in serum,triiodothyronine (T3),thyroxine (T4),prolactin (PRL),estradiol (E2),growth hormone (GH),testosterone (T) and melatonin (MELT),were measured using ELISA kits.SAS 9.0 software was used to perform significance tests on hormone concentrations between experimental and control groups at different growth phases.CORR method was employed to explore the correlation of different hormones under short photoperiod conditions.【Result】 ①Under natural photoperiod,there were differences in hormone concentrations among different color cashmere goats,such as E2 concentration in serum of red goats was extremely significantly higher than that of white goats during the telogen phase (P＜0.01),and T concentration in serum of red goats was extremely significantly higher than that of white and black goats during the catagen phase (P＜0.01).②Under short photoperiod,compared with control group,E2 concentration in serum of red goats was extremely significantly or significantly decreased during the early anagen and anagen phases (P＜0.01 or P＜0.05),T concentration was significantly increased during the anagen phase (P＜0.05),and T3 concentration was significantly increased during the early anagen phase (P＜0.05).E2 concentration in serum of white goats was significantly decreased during the early anagen, anagen and catagen phases (P＜0.05),T concentration was significantly increased during the early anagen and anagen phases (P＜0.05),T4 concentration was significantly or extremely significantly increased during the early anagen and catagen phases (P＜0.05 or P＜0.01),T3 and GH concentrations were significantly or extremely significantly decreased during the anagen phase (P＜0.05 or P＜0.01),and were extremely significantly increased during the catagen phase (P＜0.01).E2 concentration in serum of black goats was extremely significantly decreased during the early anagen and catagen phases (P＜0.01),and T concentration was significantly increased during the early anagen,anagen and catagen phases (P＜0.05).All three types of goats showed a significant increase in MELT concentration and a significant decrease in PRL concentration of serum during the early anagen and anagen phases (P＜0.05 or P＜0.01).③Under short photoperiod,the correlation results showed that there was a significant negative correlation between E2 and PRL or T and GH concentrations in red goats (P＜0.05).T concentration was positively significantly correlated with E2 and MELT concentrations (P＜0.05),and PRL concentration was negatively correlated with T,T4,GH and MELT concentrations in white goats (P＜0.05).T concentration was positively significantly correlated with E2 and T4 concentrations in black goats (P＜0.05),and T4 concentration was negatively correlated with GH concentration (P＜0.05).There were also non-significant negative correlation and antagonistic relationships among different hormones.【Conclusion】 There were differences in the response of different colored cashmere goats to photoperiod changes.Under short photoperiod, red goats primarily regulated T3 and GH concentrations,white goats exhibited increased T4,GH,and MELT concentrations and decreased T3 concentration,while black goats mainly showed the changes in E2,T and MELT concentrations.The negative correlations between hormones suggested antagonistic interactions.The results provided a scientific basis for optimizing cashmere goat breeding through photoperiod regulation.

Key words: photoperiod; cashmere goats; hormones

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