褪黑激素对珍珠长毛兔毛夏季产量的影响

应用新型褪黑激素按不同方法植入４０只成年珍珠长毛兔,观察其对夏季毛产量的影响。结果表明,在珍珠长毛兔夏毛生长期,褪黑激素处理组的夏毛产量明显高于对照组（Ｐ〈０．０５）,而粗毛长度和绒毛长度怀对照组差异不显著（Ｐ〉０．０５）。     

互交公山羊改良土种山羊效果初报

贵南县拉乙亥乡加土乎村引入海西怀头他拉乡互交公羊改良土种山羊试验已初见成效，后代适应性、生长发育良好，产绒量明显高于土种羊（Ｐ〈０．０５），周岁羊平均产绒量为２５０．３８ｇ，比同龄土种羊高７０．５５ｇ，绒毛品质优良。     

皖系粗毛型长毛兔与法系安哥拉兔毛质对比分析的初步研究

利用中法双方兔毛分析方法对刀剪毛的皖系粗毛兔和手拨毛的法系安哥拉兔兔毛的各项物理性能进行了测试比较。据法方测定：皖系粗毛兔粗毛率（不包括两型毛）、粗毛细度和细毛细度分别为１．４４９５％、３６．１７５０μｍ和１２．１８５４μｍ，均接近法系兔（Ｐ＞０．０５）；两型毛细度为２２．８８３５μｍ，比法系兔高９．８５％（Ｐ＜０．０ｌ）。经我方测定：皖系粗毛兔两型毛细度、粗毛长度及细毛强度为２８．３４６７μｍ、１１．８３４４ｃｍ和３．２２１８克，分别比法系兔高１０．１３％、ｌｌ．０９％和１９．７０％（Ｐ＜０．０５）；两型毛比例为３．８１３３％，比法系兔低７１．７４％；其他各项指标两品系间差异均不显著（Ｐ＞０．０５）。以上结果表明，皖系粗毛兔刀剪毛的各项物理性能，除两型毛外，已基本达到法系兔手拔毛的水平。     

饲粮蛋白质水平对冬毛期水貂胃肠道消化酶活性以及空肠形态结构的影响

本文旨在研究饲粮蛋白质水平对冬毛期水貂胃肠道消化酶活性以及空肠形态结构的影响。选择 ９０日龄的健康公貂 ６０只,随机分成 ６组（每组 １０个重复,每个重复 １只）,分别饲喂蛋白质水平为 ２８％（Ⅰ组）、３０％（Ⅱ组）、３２％（Ⅲ组）、３４％（Ⅳ组）、３６％（Ⅴ组）和 ３８％（Ⅵ组）的试验饲粮。预试期 ７ｄ,正试期 １１５ｄ。饲养试验结束后进行屠宰,制备胃肠道内容物上清液,用于测定消化酶活性;制备空肠组织切片,用于观察空肠的形态结构。结果表明：Ⅴ组水貂的胃蛋白酶活性极显著高于Ⅰ、Ⅱ和Ⅲ组（Ｐ＜０．０１）,与Ⅳ和Ⅵ组差异不显著（Ｐ＞０．０５）。Ⅳ组水貂的十二指肠和空肠胰淀粉酶活性极显著高于Ⅰ、Ⅱ、Ⅲ、Ⅴ和Ⅵ组（Ｐ＜０．０１）。Ⅳ和Ⅴ组水貂的回肠胰淀粉酶活性显著或极显著高于Ⅰ和Ⅱ组（Ｐ＜０．０５或 Ｐ＜０．０１）。Ⅳ组水貂的十二指肠胰蛋白酶活性极显著高于Ⅰ、Ⅱ、Ⅴ和Ⅵ组（Ｐ＜０．０１）,空肠胰蛋白酶活性极显著高于Ⅰ、Ⅱ、Ⅲ、Ⅴ和Ⅵ组（Ｐ＜０．０１）。Ⅲ组水貂的回肠胰蛋白酶活性显著高于Ⅵ组（Ｐ＜０．０５）,与其他各组差异不显著（Ｐ＞０．０５）。Ⅵ组水貂的十二指肠胰脂肪酶活性显著或极显著高于Ⅱ、Ⅳ和Ⅴ组（Ｐ＜０．０５或 Ｐ＜０．０１）,空肠胰脂肪酶活性显著或极显著高于Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ组（Ｐ＜０．０５或 Ｐ＜０．０１）。Ⅰ、Ⅲ和Ⅴ组水貂的回肠胰脂肪酶活性极显著高于Ⅱ和Ⅵ组（Ｐ＜０．０１）,与Ⅳ组差异不显著（Ｐ＞０．０５）。饲粮蛋白质水平为 ３６％时,水貂空肠绒毛高度、隐窝深度、绒毛高度与隐窝深度比值、黏膜厚度以及肠壁厚度均处在较高水平。由此得出,饲粮蛋白质水平可影响冬毛期水貂胃肠道消化酶活性,并可调节其空肠形态结构。     

绒山羊选育效果分析

对选育后成年基础母羊和精选群母羊生产性能及产绒量进行了测定和比较。结果表明，其基础群公母羊产绒量分别为４５８．６２、３０９．５３ｇ，比同龄同性别组群前分别提高１２．５９％和１７．２２％，差异均显著（Ｐ〈０．０５）；精选群公母羊分别产绒５２５ｇ和４４４．９１ｇ，比同龄同性别羊选育前提高２８．８８％和６８．３２％，差异显著（Ｐ〈０．０５）和极显著（Ｐ〈０．０１）。     

低蛋白质氨基酸平衡饲粮对早期断奶仔猪腹泻和生产性能的影响

本研究选用１８头２８±１日龄断奶的杂交仔猪（平均体重约５．５ｋｇ），研究低蛋白质氨基酸平衡饲粮对早期断奶仔猪腹泻和生产性能的影响。试验结果显示：（１）低蛋白质氨基酸平衡饲粮使仔猪血浆挥发性盐基氨含量、血浆尿素氨含量和腹泻指数降低（Ｐ＜０．０５或０．０１）。（２）采食全植物蛋白型氨基酸平衡饲粮（ＣＰ１８．３％）的仔猪，其平均日增重（ＡＤＧ）、平均日采食量（ＡＤＦＩ）和料肉比（Ｐ／Ｇ）与采食复合蛋白型对照饲粮（ＣＰ１９．７％）的仔猪差异不显著（Ｐ＞０．０５），但前者的增重成本比后者降低（Ｐ＜０．０５）３１％。（３）采食复合蛋白型氨基酸平衡饲粮（ＣＰ１８．４％）的仔猪的生产性能优于采食复合蛋白型对照饲粮（ＣＰ１９．７％）的仔猪，前者的ＡＤＧ和ＡＤＦＩ分别提高（Ｐ＜０．０５）６１％和３２％，Ｆ／Ｇ和增重成本分别下降（Ｐ＜０．０５）２４％和３７％。（４）采食全植物蛋白型氨基酸平衡饲粮的仔猪，其ＡＤＧ和ＡＤＦＩ低于（Ｐ＜０．０１）采食复合蛋白型氨基酸平衡饲粮的仔猪。前者的Ｆ／Ｇ和增重成本趋于高于后者，但差异不显著（Ｐ＞０．０５）。以上结果表明，低蛋白质氨基酸平衡饲粮可显著降低仔猪断奶后腹泻和提高仔猪生产性能。复合蛋白型?     

饲粮添加V—E对猪肉质与生化指标的影响

在生长肥育猪饲粮中添加维生素Ｅ,试验组平均日增重和饲料报酬均高于对照组。试猪体重达９０ｋｇ左右屠宰,进行肉质测定,结果表明,试验组试猪肉色鲜红,ｐＨ值正常（６．２４）,系水力（Ｐ＜０．０５）、嫩度（Ｐ＜０．０１）、熟肉率（Ｐ＜０．０５）均优于对照组;试验组试猪肌原纤维直径细（Ｐ＜０．０１）,肌节、Ⅰ带长（Ｐ＜０．０１）,机体组织中维生素Ｅ的含量显著提高,血清中ＬＤＨ和ＣＫ活性显著降低（Ｐ＜０．０１）,ＧＯＴ和ＧＰＴ活性与对照组差异不显著（Ｐ＞０．０５）。     

添加外源性酶对猪、鸡内源消化酶活性的影响

观察了猪、鸡不同类型饲粮中添加外源性酶制剂后对其内源性消化酶活性的影响。结果,玉米－豆粕型饲粮中添加外源酶后,３７及６７日龄丝毛乌骨鸡的小肠胰蛋白酶活性分别提高１３．１５％（Ｐ＜０．０５）和９．４５％（Ｐ＜０．０５）,总蛋白水解酶活性提高７．３０％（Ｐ＞０．０５）和１３．７％（Ｐ＜０．０５）,但α－淀粉酶活性无显著变化;高麸皮饲粮中添加外源酶可使４９日龄ＡＡ肉鸡的胰蛋白酶,总蛋白水解酶和α－淀粉酶活性分别提高４６．５０％（Ｐ＜０．０５）,１５．２０％（Ｐ＞０．０５）和７９．８０％（Ｐ＜０．０５）,而对胰脏中α－淀粉酶、脂肪酶活性无显著影响;高次粉饲粮中添加外源酶可使杜长大仔猪的小肠总蛋白水解酶活性提高２１．００％（Ｐ＜０．０５）,而对肠α－淀粉酶活性无显著影响;大麦－豆粕型饲粮中添加外源酶可使杜长大肥育猪的肠胰蛋白酶活性下降３６．９０％（Ｐ＜０．０５）,肠脂肪酶活性提高７２．７％（Ｐ＜０．０５）,而对小肠α－淀粉酶和胰脏α－淀粉酶、脂肪酶活性无显著影响。据此认为,外源性酶与畜禽内源性消化酶活性的关系较为复杂,受到动物品种和饲粮类型的影响,尤其是后者。     

长白猪、北京黑猪及东北民猪脂肪酸及氨基酸组成

本文测定了长白猪、北京黑猪及东北民猪背最长肌脂肪酸及氨基酸的组成。结果表明：１，长白猪总饱和脂肪酸含量显著高于北京黑猪（Ｐ＜０．０５）及民猪（Ｐ＜０．０５），北京黑猪显著高于民猪（Ｐ＜０．０５）；民猪的总不论和脂肪酸含量显著高于长白猪（Ｐ＜０．０５），与北京黑猪差异不显著（Ｐ＞０．０５）；不同性别猪各脂肪酸含量差异不显著，２，３个猪种中１５种氨基酸及衍生物含量有显著差异（Ｐ＜０．０５）。民猪和北京黑猪赖氨酸的含量显著高于长白猪，北京黑猪苏氨酸含量低于长白猪（Ｐ＜０．０５）。不同性别个体间游离氨基酸组成除丝氨酸、缬氨酸、苯丙氨酸外，没有显著差异（Ｐ＞０．０５）。     

粗饲料组合对奶牛饲粮养分消化率、能量和氮的利用的影响

本试验旨在研究粗饲料组合对奶牛饲粮养分消化率、能量和氮的利用的影响。试验采用单因素随机区组设计,将 １６头体重、年龄、胎次相近的,处于干奶期的健康荷斯坦奶牛分为 ４组,每组 ４头。以常用的粗饲料设计 Ａ（玉米青贮 ＋玉米秸秆）、Ｂ（玉米青贮 ＋羊草）、Ｃ（玉米青贮 ＋玉米秸秆 ＋羊草）、Ｄ（玉米青贮 ＋苜蓿草 ＋羊草）４种粗饲料组合的饲粮。结果表明：饲粮Ｄ干物质、有机物和中性洗涤纤维的消化率最高,显著高于其他各饲粮（Ｐ＜０．０５）,其次为饲粮Ｂ和饲粮 Ｃ,饲粮 Ａ最低,显著低于其他各饲粮（Ｐ＜０．０５）,各饲粮的酸性洗涤纤维消化率差异不显著（Ｐ＞０．０５）。粗饲料组合显著影响饲粮摄入总能、能量消化率和能量代谢率（Ｐ＜０．０５）,饲粮 Ｄ甲烷能占摄入总能比显著低于其他 ３种饲粮（Ｐ＜０．０５）。各饲粮的粪氮、尿氮占摄入总氮比差异不显著（Ｐ＞０．０５）,饲粮 Ｄ的氮消化率显著高于饲粮 Ｂ与饲粮 Ｃ（Ｐ＜０．０５）,且饲粮 Ｂ显著高于饲粮 Ａ（Ｐ＜０．０５）;饲粮 Ｂ、饲粮 Ｄ的氮利用率显著高于饲粮 Ａ（Ｐ＜０．０５）。由此可见,玉米青贮 ＋苜蓿草 ＋羊草型饲粮的养分消化率、能量和氮的利用均优于其他各饲粮,羊草与玉米秸秆之间存在正组合效应,两者搭配使用可提高玉米秸秆的消化率,优化能量和氮的利用。     

Effects of field bean (Vicia faba L. var. minor) dietary supplementation on plasma thyroid hormones, insulin, insulin-like growth factor-1 concentrations and mohair characteristics in growing Angora goat kids

Twenty-two Angora kids were used to study the effect of a dietary supplementation with field bean (Vicia faba L. var. minor) on hair follicle activity, mohair characteristics and plasma total thyroxine (T4), triiodothyronine (T3), insulin (INS) and insulin-like growth factor-1 (IGF-1) concentrations. At birth, their mothers were divided in two groups (S: supplemented, C: control), the S group being supplemented with 300 g/head/day of whole field bean. At weaning, diet of kids from S group was supplemented with 80 g/head/day of whole field bean. At weaning, secondary hair follicle activity (S: 0.91 ± 0.01, C: 0.84 ± 0.02, p < 0.01) and staple length (S: 5.82 ± 0.13 cm, C: 5.16 ± 0.14 cm, p < 0.001) were greater in the S group. At 155 days of age, secondary fibre diameter (S: 16.54 ± 0.35 μm, C: 18.09 ± 0.31 μm, p < 0.01) was higher in the C kids. Concentrations of total plasma T4 and T3 were higher (p < 0.001) in S (120 ± 12 and 4.87 ± 0.92 ng/ml respectively) than in C kids (92 ± 8 and 2.97 ± 0.77 ng/ml respectively). At weaning, T4 values were negatively correlated (p < 0.05) with the secondary fibre diameter and the T3/T4 ratio was positively correlated (p < 0.05) with the secondary to primary hair follicle ratio. At 155 days of age, both T3 and T3/T4 values were positively correlated (p < 0.01) with staple length. Plasma INS (0.11 ± 0.03 ng/ml) and total IGF-1 concentrations (232 ± 13 ng/ml) were not affected by diet. Improvements of diet quality in kids positively affected fibre diameter and length and follicle activity rate. We suggest that increased circulating thyroid hormones concentrations, but not those of INS and IGF-1, may contribute to the beneficial actions of nutritional supplementation on anatomical growth and mohair production of kids.     

Effect of sex and rearing system on the quality and mineral content of fiber from raeini cashmere goats

The aim of this study was to compare the quality characteristics and mineral content of the fiber from male and female cashmere goats raised under different management systems. Male and female Raeini cashmere goats (<1.5 years of age, n = 48) were selected from flocks raised at a government breeding station or raised commercially under either rural or nomadic conditions. The staple length, cashmere fiber diameter, coefficient of variation for fiber diameter, percentage of cashmere in a fleece, percentage of guard hair in a fleece and cashmere tenacity averaged 4.6 ±0.1 cm, 18.0 ±0.1 m, 20.9 ± 0.4%, 66.1 ± 1.5%, 33.8 ± 1.5% and 1.8 ± 0.2 gf/tex, respectively. The sulfur, copper and zinc content of the cashmere averaged 2.8 ± 0.1%, 0.00065 ± 0.00002% and 0.01276 ± 0.00025%, respectively. Rearing method significantly affected staple length, coefficient of variation of fiber diameter, cashmere tenacity and copper content. Males had a higher coefficient of variation of fiber diameter and cashmere tenacity than females (P < 0.05).     

毛纤维鳞片品质分析

对青海的藏羊、青海半细毛羊、新疆细毛羊、牦牛、骆驼以及毛丝鼠的16种毛纤维鳞片进行扫描,分别进行厚度、倾角、高度、密度等测定。结果认为:各种毛纤维随着直径变小,表现出鳞片密度增加,厚度下降;不同畜种的毛纤维鳞片形态及品质有较大差异,但细度接近的毛纤维各测试值接近;在受损程度上,从大到小排列为驼毛、牦牛毛、青海藏羊粗毛;同一毛丛中外层毛的受损程度大于底绒;鳞片之间互相衔接紧密,重叠面深的纤维,鳞片的倾角就小,毛干光滑,光泽强,鳞片相对大、宽、高。     

日粮中添加半胱胺对辽宁绒山羊产绒性能的影响

本试验选用20头6月龄的辽宁绒山羊,平均体重约为16 kg,完全随机分为半胱胺组和对照组。两组饲喂的基础日粮一样,半胱胺组每周添加1次半胱胺,剂量为100 mg/kg,制成颗粒料一次性饲喂;试验期60 d。研究半胱胺对绒山羊产绒性能的影响。结果表明,半胱胺组绒自然长度、毛自然长度、绒伸直长度、毛伸直长度较对照组显著提高(P0.05);半胱胺组绒、毛强度,绒、毛伸度较对照组显著提高(P0.05),半胱胺组绒毛细度比对照组显著降低(P0.05);半胱胺组粗毛细度比对照组显著提高(P0.05)。因此,日粮中添加半胱胺可以改善辽宁绒山羊绒毛的品质。     

辽宁绒山羊绒直径变异的研究

本文系统分析了环境因素对辽宁绒山羊绒直径的影响、绒直径的遗传特点及其群体绒直径的分布情况。羊绒自根部至尖部逐渐变粗，尖部与根部绒直径相差３．３１μｍ；体躯绒直径最小部位与最大部位差异为２．０９μｍ；３周岁时绒直径最大，公羊平均绒直径比母羊高１．０μｍ；同一公羊雄性后代的绒直径比雌性后代平均高０．５１μｍ；公羊年龄对后代具有显著的影响（Ｐ＜０．０５）；绒直径的遗传力为０．４２１，与产绒量、体重的遗传相关分别为０．６５８和０．１１２。部分公羊的后代具有产绒量高、体重大而绒直径小的理想组合。在整个群体中２６．４０％的母羊和５３．５１％的公羊生产１４．５μｍ以下的羊绒，９．６％的３周岁母羊和５．９％的３周岁公羊生产１４．５μｍ以下的羊绒     

无角陶赛特与欧拉型藏羊杂种一代羊被毛纤维类型分析

对无角陶赛特与欧拉型藏羊杂种一代的被毛纤维类型进行了分析。结果表明：在杂一代羊被毛纤维类型中，按重量计算绒毛、两型毛、干死毛分别占70、18％，10．13％和18．93％；与其母本欧拉型藏羊相比，干死毛和两型毛比例明显下降，绒毛比例明显上升，特别是杂种羊中有一只羊的毛被已经达到同质水平。     

埋植褪黑激素的水貂冬季直针毛生长过程及鳞片形态性状研究

为研究埋植褪黑激素的水貂(Mustela vison)冬季直针毛生长过程及形态学性状的特点,测量埋植褪黑激素后31 d、62 d和75 d的水貂鲜皮腹部、背部和臀部新生冬季直针毛的毛长度、毛最粗处细度、毛根无髓段长度及毛根扁平型鳞片总长度等形态学指标。统计分析结果表明:埋植褪黑激素31 d后,水貂3个部位均出现了新生冬季直针毛;且臀部的新生冬季直针毛的毛长度最大,单位面积上新生冬季直针毛数量最多。埋植褪黑激素后31 d至62 d冬季直针毛的平均生长速度为:腹部(0. 33±0. 07) mm/d、背部(0. 44±0. 07) mm/d、臀部(0. 45±0. 08) mm/d,埋植褪黑激素后62 d至75 d冬季直针毛的平均生长速度为:腹部(0. 25±0. 06) mm/d、背部(0. 29±0. 10) mm/d、臀部(0. 36±0. 03) mm/d,均表现为臀部>背部>腹部的情形。埋植褪黑激素后31 d至62 d的冬季直针毛平均生长速度较快;埋植褪黑激素后62 d至75 d的冬季直针毛平均生长速度降低。冬季直针毛的长度与毛根无髓段长度、毛根扁平型鳞片总长度相关性不显著(P>0. 05);毛最粗处细度与毛根无髓段长度、毛根扁平型鳞片总长度相关性不显著(P>0. 05);毛根无髓段长度与毛根扁平型鳞片总长度呈极显著正相关(P <0. 01)。判断水貂取皮时间时,可以选择冬季直针毛的毛根无髓段长度作为指标。     

Effects of different dietary protein levels and DL‐methionine supplementation on hair growth and pelt quality in mink (Neovision vision)

The effect of different dietary protein levels and DL‐methionine (Met) supplementation on hair growth and the resulting pelt quality in mink was studied. Four groups of male mink were fed with four isocaloric diets containing 32% (P32), 24% (P24), 16% (P16) or P24+Met (0.8%) crude protein of dry matter (DM) from September to December. Skin biopsies were taken at the pelting. Histological techniques and computer‐assisted light microscopy were used to determine the ratio of activity (ROA) of under hairs and guard hairs respectively. The results showed that when the dietary protein level reduced from 32% to 16%, body length, number and diameter of under hairs and guard hairs of minks declined, and pelt length and pelt weight of minks decreased significantly (p < 0.05). These parameters were similar between P32 and P24 with Met supplementation (p > 0.05). The hair follicle density of the winter coat was not influenced by the dietary protein levels and Met supplementation (p > 0.05). Low‐protein diets content led to a reduction of hair follicle developing to next phase. It was documented that 24% crude protein of DM with Met supplementation during growing‐furring period was sufficient for minks to express their genetic capacity to develop hair follicles and achieve the prime fur characteristics. Overall this study demonstrated that hair growth and hair properties in pelts are very dependent on the dietary protein and Met supply in the growing‐furring period of minks.     

滩羊二毛期羊毛性状分析及其相关性研究

本试验旨在探究滩羊二毛期羊毛性状及其相关性,采集出生当天(初生期)及30～40日龄(二毛期)的滩羊样本各511个,其中公羊260只,母羊251只,分别测定初生期和二毛期羊毛的侧部毛长和侧部弯曲数;并分析了二毛期两型毛和绒毛的平均纤维直径(MFD)、平均纤维曲率(MFC)、毛纤维直径变异系数(CVFD)和毛纤维直径标准差(FDSD),对羊毛性状进行描述性统计及相关性分析。结果显示:初生期滩羊羊毛侧部弯曲数和初生期侧部毛长呈极显著中等正相关(r=0.410,P<0.001);初生期侧部弯曲数和二毛期侧部弯曲数间存在极显著中等正相关(r=0.618,P<0.001);两型毛FDSD与CVFD间呈极显著强正相关(r=0.796,P<0.001),绒毛FDSD与CVFD间极显著强正相关(r=0.942,P<0.001);两型毛MFD与FDSD呈极显著中等正相关(r=0.511,P<0.001),绒毛MFD与FDSD呈极显著中等正相关(r=0.660,P<0.001);绒毛MFD与CVFD呈极显著中等正相关(r=0.410,P<0.001),两型毛MFD与CVFD呈显著弱负相关(r=―0.106,P<0.05);绒毛MFD和MFC间呈极显著中等负相关(r=―0.497,P<0.001),两型毛MFD和MFC间呈弱正相关,相关性不显著(r=0.011,P>0.05)。本试验首次大规模检测了滩羊二毛期羊毛的性状指标,确定了各指标间的相关关系,为滩羊裘皮性状的选育提供数据支撑。     

Resistance of cattle of various genetic groups to the tick Rhipicephalus microplus and the relationship with coat traits

This study evaluated the resistance of cattle of different genetic groups to the tick Rhipicephalus microplus and the relationship with traits of the animals' hair and coat. Cows of the Senepol×Nelore (SN), Angus×Nelore (AN) and Nelore (NX) genetic groups were submitted to four consecutive artificial infestations, at 14-day intervals, each one with approximately 20,000 tick larvae placed on the animals' lumbar region. From the 19th to 23rd day of each infestation five counts of the number of ticks were performed on each animal's left body side. The tick count data (TTC) were transformed into log(10) (n+1), and also into percentage of return (PR), where n is the total number of ticks counted at each infestation. Hair samples were collected 24h after the last infestation with flat-nosed pliers. Measures of the average hair length (HL), coat thickness (CT), number of hairs per cm(2) (NHCM2) and weight of the samples (SW) were obtained. Pearson's correlation coefficients were calculated within genetic group to measure association between PR and the hair and coat data. There was a significant difference among genetic groups for the number of ticks, with the AN group having higher counts than the SN and NX groups. For the hair and coat traits, the NX and SN groups had lower values of HL and SW than did the AN group. The SN genetic group had lower NHCM2 counts than the NX and AN groups. There were positive correlations between TTC and CT (P<0.05) and SW (P<0.05) in the SN group. No significant correlation was found for the AN genetic group (P>0.05).