In order to reveal the changing laws of Shaanbei white Cashmere goat's principal body measurements, body weight, cashmere yield and cashmere length with the growth age so as to provide basic parameters and theoretical basis for Shaanbei white cashmere goat production, the related data of 1103 ewes in 2009 to 2011 from Shaanbei White Cashmere Goat Farm were collected to be analyzed. The results show that (1)before 2 years old, the four body measurements grew rapidly,from 3-5 years old,they grew slowly, and until 5 years old they reached the adult standards; after 5 years old, they stopped increasing and sta-blized;(2) before 3 years old, the body weight grew fast, and the annual average growth rate was about 40%,until 3 years old it reached the weight of adults (29. 32 + 4. 73) kg; it kept growing slowly after 4 years old and the weight of ewes maintained at (29. 34 + 4. 73)kg to (31. 63 + 6. 38) kg,with a yearly average growth rate of 2. 5%; (3)before 3 years old, with the increase of cashmere yield and cashmere length, both reached the peak of whole life till 3 years old, the two indexes dropped to different degrees, among which cashmere yield declined slowly with the increase of age,while the cashmere length of 4-8-year-old e-wes dropped slightly compared with that of 3-year-old,it presented a wave mode trend.%为揭示陕北白绒山羊母羊主要体尺、体重、绒产量和绒纤维长度随年龄变化规律,以期为合理组织陕北白绒山羊生产提供基础参数和理论依据.从陕西省陕北白绒山羊种羊场2009年～2011年原始生产记录中共采集1103只(次)母羊的相关数据,对其进行统计分析.结果表明:(1)2岁以前为4项体尺快速增长期,3岁～5岁为缓慢增长期,至5岁时4项体尺已基本达到成年标准;5岁以后4项体尺均基本停止生长,保持稳定状态;(2)3岁以前为体重快速增长阶段,该阶段体重年均增长达40％左右,至3岁时体重已基本达到成年体重(29.32±4.73)kg;4岁以后为体重缓慢增长阶段,母羊体重羁绊保持在(29.32土4.73)kg～(31.63±6.38) kg之间,其年均增长率仅为2.5％左右;(3)3岁以前,随着年龄增长产绒量和绒长度均快速增加,至3岁时均达到其一生中的生长峰值,4岁及其以后二者均不同程度下降,其中产绒量随年龄增加呈缓慢下降,而4岁～8岁母羊的绒长度较3岁时略有下降后,不同年龄母羊绒长度呈不规则的波浪式变化.
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