Abstract The objective of this trial was to determine if an anticipated first shearing at 10 months of age affects skin characteristics and fibre quality in alpacas in order to assess the possibility of practice two different shearings over a period of 16 months in the animals destined for slaughter. Twenty alpaca Huacaya (10 females and 10 males) were randomly assigned to two groups named Group S and Group NS. Group S alpacas were sheared in December at the age of 10 months, when fibre had reached the length of 12.78 cm. Group NS alpacas were not sheared and their fibre length in December at the age of 10 months was of 13.11 cm. Skin biopsies and fleece were sampled from each animals at 10, 11, 12, and 16 months of age. The recorded data were used to calculate the fibre diameter, the fibre length, the percentage of active secondary follicles and the ratio of secondary to primary follicles. Data were analysed as a split-plot design with the shearing effect as whole-plot, the age effect as subplot and the animals as replication term in testing the shearing effect. Fibre diameter, percentage of active secondary follicles and S/P ratio showed no statistically significant differences between treatment groups and age. Significant different (P

中文翻译：

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剪毛和未剪毛一岁羊驼 (Vicugna pacos) 的羊毛质量和毛囊活动的比较

摘要 本试验的目的是确定预计在 10 个月大时进行的第一次剪毛是否会影响羊驼的皮肤特征和纤维质量，以评估在 16 个月内对预定屠宰的动物进行两种不同剪毛的可能性。 . 20 只华卡亚羊驼（10 只雌性和 10 只雄性）被随机分配到 S 组和 NS 组两个组中。S 组羊驼在 12 月 10 个月大时被剪毛，此时纤维长度已达到 12.78 厘米。NS组羊驼没有剪毛，12月10月龄时的纤维长度为13.11厘米。从每只 10、11、12 和 16 个月大的动物身上取样皮肤活检和羊毛。记录的数据用于计算纤维直径、纤维长度、活跃的次级卵泡的百分比和次级与初级卵泡的比率。数据作为裂区设计进行分析，剪切效应为整区，年龄效应为子区，动物作为测试剪切效应的重复项。纤维直径、活跃的次级卵泡百分比和 S/P 比在治疗组和年龄之间没有统计学上的显着差异。显着差异（P