控制光照对内蒙古白绒山羊褪黑激素含量的影响

Effect of Photoperiod Control on Blood Concentration of Melatonin in Inner Mongolia White Cashmere Goat

为研究非长绒期控制光照对内蒙古白绒山羊褪黑激素(MLT)含量的影响,随机选取12只年龄、产绒量和体重基本一致的内蒙古白绒山羊母羊,分为控制光照组(试验组)和对照组,每组各6只,采集血液样品进行褪黑激素含量测定,利用SAS 9.0软件进行显著性检验和相关性分析。结果表明,控制光照(试验组)使白绒山羊血液中的MLT含量在20:00、21:40、6:40时高于对照组,20:00、6:40时两组白绒山羊MLT含量差异显著(P<0.05),试验组白绒山羊血液中MLT含量的高峰期维持时间显著长于对照组。10月,试验组与对照组MLT含量变化基本一致,差异均不显著(P>0.05);对照组中10月白绒山羊血液中的MLT含量明显高于6月,但控制光照的白绒山羊血液中的MLT含量最高,说明控制光照可改变皮肤毛囊发育及绒毛生长周期,最终使内蒙古白绒山羊在非长绒期绒毛提前生长。

In order to investigate the effect of photoperiod control on blood concentration of melatonin （MLT） in Inner Mongolia white cashmere goat during cashmere non-growing period, a total of 12 female Inner Mongolia white cashmere goats with similar age, cashmere production and body weight were selected and allocated to experimental group （short photoperiod, n =6） and control group （normal photoperiod, n=6）. The blood samples were collected from the ewes to determine the MLT concentration, and the differences in blood MLT concentration between experimental group and control group were statistically assessed. The results showed that the higher blood MLT concentration were observed in experimental group at 20：00 （P〈0.05）, 21：40, and 6：40 （P〈0.05） compared to control group, and the duration of the peak concentration of blood MLT was longer in experimental group compared to control group. In October, the variation of blood MLT concentration in experimental group was similar to that in control group, and no significant differences in blood MLT concentration between experimental group and control group were observed （P〉0.05）; for control group, the blood MLT concentration was obviously higher in October compared to June, but the highest value of blood MLT concentration was observed in the ewes receiving short photoperiod treatment. Collectively, these data reveal that the photoperiod regulates the hair follicle development and cashmere growth cycle, and the short photoperiod treatment stimulates the early cashmere growth in the non-growing period in Inner Mongolia white cashmere goat.