Abstract Knowledge of associations between skin follicle development in Angora goats and development of mohair fleeces is limited. These associations were investigated using data from a controlled nutrition experiment which had 3 levels of mid pregnancy nutrition (MPN) × 2 levels of postnatal nutrition during lactation (PNN), with single and twin litters. Skin biopsies were taken (birth, 114, 180, 420 days of age). Mid-side fibre growth and physical properties were determined 6 times between birth and 180 days of age. Birth coats were visually scored (1, straight; 5 curly). Fibre diameter distribution histograms were analysed at these ages. Skin area was measured. Total number of follicles and fibre growth per day determined. Fleeces were harvested at 7, 13 and 19 months of age and tested. Average fleece-free live weight (AvFFLwt) during fleece growing periods was determined. Data were analysed for treatment effects, correlations between attributes and multiple linear regression analysis performed to determine relationships between mean fibre diameter (MFD) at different ages with variables. AvFFLwt over the study within shearing intervals ranged from 5.8 to 37.6 kg. Density of secondary follicles (Ds) at 180 days of ranged from 10.8 to 34.0 mm−2, ratio of secondary to primary skin follicles (S/P) at 420 ranged from 4.8 to 14.1. Total fibre growth/day was related to the surface area (size) of kids, as surface area increased proportionally with live weight0.73. Smaller kids (female, twin reared) grew respectively 15–23% less fibre than larger male and 13–16% less than single reared goats. MFD was 27.8 μm at birth, then declined before increasing after 2 months of age. PNN had small effects on fibre diameter CV which was high at birth before declining rapidly during the first three months of life. There were negative correlations between both Ds and S/P ratio with: MFD; and the incidence of medullated fibres (patch fibre growth and fleeces at 13 and 19 months). The magnitude of these correlations increased with age. Birth coat score was negatively associated with fleece value. Predictions of MFD at shearing were related to log10AvFFLwt during the growth period, either Ds or S/P ratio, sex of kid, and a covariate term for the dam MFD. Greater Ds and S/P ratios greater than 9 were associated with finer mohair and more valuable fleeces.

中文翻译：

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马海毛羊毛的发育和生长以及毛囊数量、马海毛物理特性、动物大小和羊毛价值之间的关系

摘要 关于安哥拉山羊皮囊发育与马海毛羊毛发育之间关联的知识是有限的。这些关联使用来自受控营养实验的数据进行研究，该实验具有 3 个水平的妊娠中期营养 (MPN) × 2 个水平的哺乳期产后营养 (PNN)，包括单胎和双胎。进行皮肤活检（出生、114、180、420 ​​天）。从出生到 180 日龄，中间纤维生长和物理特性测定了 6 次。对出生被毛进行视觉评分（1，直的；5 卷曲的）。分析了这些年龄的纤维直径分布直方图。测量皮肤面积。确定每天的毛囊总数和纤维生长。在 7、13 和 19 个月大时收获羊毛并进行测试。测定了羊毛生长期间的平均无羊毛活重 (AvFFLwt)。对治疗效果、属性之间的相关性和多元线性回归分析的数据进行了分析，以确定不同年龄的平均纤维直径 (MFD) 与变量之间的关系。研究中剪切间隔内的 AvFFLwt 范围为 5.8 至 37.6 kg。180 天时次级毛囊 (Ds) 的密度范围为 10.8 至 34.0 mm-2，420 时次级与初级皮肤毛囊的比率 (S/P) 范围为 4.8 至 14.1。总纤维生长/天与孩子的表面积（大小）有关，因为表面积与活重成比例增加0.73。较小的山羊（雌性，双胞胎）比较大的雄性山羊生长的纤维分别少 15-23%，比单饲养山羊少 13-16%。出生时 MFD 为 27.8 μm，然后下降，然后在 2 个月大后上升。PNN 对出生时较高的纤维直径 CV 影响很小，然后在生命的前三个月迅速下降。Ds 和 S/P 比率之间存在负相关：MFD；和有髓纤维的发生率（13 个月和 19 个月时的纤维片生长和起毛）。这些相关性的程度随着年龄的增长而增加。出生被毛评分与羊毛价值呈负相关。剪切时 MFD 的预测与生长期间的 log10AvFFLwt、Ds 或 S/P 比、孩子的性别以及大坝 MFD 的协变量项相关。Ds 和 S/P 比大于 9 与更细的马海毛和更有价值的羊毛有关。PNN 对出生时很高的纤维直径 CV 影响很小，然后在生命的前三个月迅速下降。Ds 和 S/P 比率之间存在负相关： MFD；和有髓纤维的发生率（13 个月和 19 个月时的纤维片生长和起毛）。这些相关性的程度随着年龄的增长而增加。出生被毛评分与羊毛价值呈负相关。剪切时 MFD 的预测与生长期间的 log10AvFFLwt、Ds 或 S/P 比、孩子的性别以及大坝 MFD 的协变量项相关。Ds 和 S/P 比大于 9 与更细的马海毛和更有价值的羊毛有关。PNN 对出生时较高的纤维直径 CV 影响很小，然后在生命的前三个月迅速下降。Ds 和 S/P 比率之间存在负相关：MFD；和有髓纤维的发生率（13 个月和 19 个月时的纤维片生长和起毛）。这些相关性的程度随着年龄的增长而增加。出生被毛评分与羊毛价值呈负相关。剪切时 MFD 的预测与生长期间的 log10AvFFLwt、Ds 或 S/P 比、孩子的性别以及大坝 MFD 的协变量项相关。Ds 和 S/P 比大于 9 与更细的马海毛和更有价值的羊毛有关。和有髓纤维的发生率（在 13 个月和 19 个月时纤维块生长和起毛）。这些相关性的程度随着年龄的增长而增加。出生被毛评分与羊毛价值呈负相关。剪切时 MFD 的预测与生长期间的 log10AvFFLwt、Ds 或 S/P 比、孩子的性别以及大坝 MFD 的协变量项相关。Ds 和 S/P 比大于 9 与更细的马海毛和更有价值的羊毛有关。和有髓纤维的发生率（13 个月和 19 个月时的纤维片生长和起毛）。这些相关性的程度随着年龄的增长而增加。出生被毛评分与羊毛价值呈负相关。剪切时 MFD 的预测与生长期间的 log10AvFFLwt、Ds 或 S/P 比、孩子的性别以及大坝 MFD 的协变量项相关。Ds 和 S/P 比大于 9 与更细的马海毛和更有价值的羊毛有关。