酒精阳性乳患牛血清及乳清离子和微量元素分析

通过检测不同酒精阳性乳血清和乳清中Ca²⁺、Mg²⁺、Na⁺、K⁺浓度及Cu、Zn、Fe、Mn含量,探讨其与酒精阳性乳的关系,结果显示,酒精阳性乳患牛体内的微量元素Zn、Cu和Fe代谢紊乱,会导致抗氧化酶的活性降低、毒性产物含量升高而使自由基代谢平衡紊乱,且Zn、Cu含量的缺乏会降低机体的免疫力;患牛乳中过多的Ca²⁺、Mg²⁺中和酪蛋白微胶粒表面的电荷,导致酪蛋白稳定性下降,致使乳胶体聚集能力增强;这些都易导致酒精阳性乳的形成。     

游离棉酚水平对海兰蛋鸡生产性能的影响

选用43周龄海兰褐壳蛋鸡120羽,随机分成4组,每组3个重复,每个重复10羽鸡分别饲喂游离棉酚(FG)含量为0mg/kg、20mg/kg、70mg/kg、120mg/kg的试验日粮。试验结果表明:(1)日粮游离棉酚水平对产蛋率影响不显著(P>0.05),(2)日粮游离棉酚水平对蛋重影响不显著(P>0.05)。(3)当FG达到120mg/kg时,蛋鸡的日采食量比对照组显著降低(P<0.05),下降了1.4g;日粮中FG含量达到70mg/kg时蛋鸡的日采食量略有下降。     

糖萜素对固始鸡免疫器官发育及T淋巴细胞亚群的影响

应用流式细胞仪技术检测固始鸡CD3⁺、CD4⁺和CD8⁺ T淋巴细胞含量来研究添加不同剂量的糖萜素对固始鸡免疫器官及T淋巴细胞亚群的影响。结果表明,500、700 mg/kg糖萜素组的免疫器官指数及CD4⁺／CD8⁺比值显著(P<0.05)高于其余各组。因此,一定剂量的糖萜素可以促进固始鸡免疫器官发育,提高T淋巴细胞亚群的水平。     

酵母培养物对绒山羊机体免疫指标的影响

本研究旨在观察酵母培养物(yeast culture,YC)对绒山羊机体免疫指标的影响。选用12只健康的内蒙古白绒山羊半同胞羯羊,按体重配对原则分为4组。其中A1、A3处理组饲喂精粗比为3∶7的基础日粮,B1、B2处理组饲喂精粗比为2∶8的基础日粮。采用自身对照试验方法,对照期饲喂基础日粮,试验期在基础日粮上分别添加不同水平的酵母培养物。各处理组日粮中YC添加量分别为A1:2.0%、A3:3.0%、B1:2.0%和B2:2.5%。分别在对照期最后1天、添加YC的第15天、第45天测定绒山羊机体免疫指标。结果表明:对照期、添加YC后的第15天和第45天,各处理组间血液IgA、IgG、T淋巴细胞亚群CD4 、CD8 比例以及CD4 /CD8 的比值间均无显著差异(P>0.05)。添加YC后的第15天和第45天,A3和B1处理组血清IgA含量极显著高于对照期(P<0.01),B2处理组血清IgG含量显著高于对照期(P<0.05)。各处理组T淋巴细胞亚群中CD4 的比例在添加YC后第15天略有升高(P>0.05);CD8 的比例在试验期第15天略有下降(P>0.05);CD4 /CD8 的比值在添加YC第15天均有较大幅度提高(P>0.05)。添加YC后第45天3个指标均恢复到对照期水平。结果表明,添加YC可以显著增加绒山羊血清IgA含量,并提高血清IgG含量;在添加YC初期机体外周血CD4 /CD8 比例有升高的趋势.     

牛磺鹅去氧胆酸对热应激小鼠免疫功能的调节作用

为探讨牛磺鹅去氧胆酸(taurochenodeoxycholic acid,TCDCA)对热应激小鼠免疫功能的调节作用,试验将50只小鼠随机分成5组,分别为对照组、热应激组和低、中、高剂量TCDCA组(剂量分别为50、100、200 mg/kg)。热应激组和低、中、高剂量TCDCA组小鼠置于(35.5±0.5) ℃、相对湿度60%环境下连续热应激7 d。结束后分别检测小鼠脾脏指数、血清IgG、小肠sIgA的含量及外周血T淋巴细胞亚群和B淋巴细胞的变化。结果表明,热应激引起小鼠脾脏指数显著下降(P＜0.05),血清IgG、肠sIgA显著升高(P＜0.05),外周血CD8⁺、CD19⁺百分率显著下降(P＜0.05),CD4⁺百分率下降不显著(P＞0.05),CD4⁺/CD8⁺比值显著升高(P＜0.05),表明热应激导致小鼠机体免疫功能发生紊乱。TCDCA对热应激小鼠脾脏指数无显著影响;但能显著抑制热应激引起的血清IgG含量、小肠sIgA含量升高(P＜0.05)和显著提高外周血CD8⁺、CD19⁺百分率(P＜0.05),同时能够调节CD4⁺/CD8⁺ 比值到正常水平。因此,TCDCA对热应激导致的小鼠免疫功能紊乱具有显著的改善作用。     

饲粮中添加抗菌肽对肉鸭增重及血清尿素氮、总蛋白水平的影响

240只1日龄肉鸭随机成分4组,每组设3个重复,对照组用基础日粮,试验组在基础日粮上每千克分别添加1、2、3mL抗菌肽制剂。结果显示:1)2、3mL/kg添加量组增重效果显著(P<0.05),3mL/kg添加量组最佳;净肉率升高,达到显著水平(P<0.05),其中主要是胸肌率上升;腹脂率降低但差异不显著(P>0.05);料重比无显著变化(P>0.05)。2)血清总蛋白浓度差异不显著(P>0.05),但尿素氮浓度下降,2、3mL/kg添加量组达显著水平(P<0.05),3mL/kg添加量组最低。     

日粮碘添加水平对断奶至2月龄生长肉兔生长性能和血清生化指标的影响

本试验旨在研究日粮碘添加水平对断奶至2月龄生长肉兔生长性能和血清生化指标的影响.选用80只平均体重为(780±50)g的35日龄断奶新西兰肉兔,随机分成4组(每组20个重复,每个重复1只兔),分别饲喂在基础日粮中添加0(对照)、0.1、0.5和2.5 mg/kg碘的试验日粮,预试期7 d,正试期23 d.结果表明:日粮碘添加水平对平均日增重(ADG)有显著影响(P<0.05),0.1和0.5 mg/kg组的ADG显著高于对照组(P<0.05).日粮碘添加水平对料重比(F/G)有显著影响(P<0.05),0.5 mg/kg组的F/G显著低于对照组和0.1 mg/kg组(P<0.05).日粮碘添加水平对血清常规生化指标影响不显著(P>0.05).日粮碘添加水平对血清免疫球蛋白A(IgA)含量有显著影响(P<0.05),0.5 mg/kg组的IgA含量显著高于其他各组(P<0.05).日粮碘添加水平对血清免疫球蛋白G(IgG)和免疫球蛋白M(IgM)含量无显著影响(P>0.05).日粮碘添加水平对血清三碘甲腺原氨酸(T3)含量有极显著影响(P<0.01),随着碘添加水平的增加,T3含量先升高后降低,当碘添加量为0.5 mg/kg时T3含量达到最大值.日粮碘添加水平对血清四碘甲腺原氨酸(T4)含量的影响不显著(P>0.05).综上所述,断奶至2月龄生长肉兔日粮中碘适宜添加量为0.5 mg/kg(基础日粮碘含量为0.22 mg/kg).     

香菇多糖对仔猪生产性能、部分血清激素和免疫指标的影响

本试验在基础日粮中添加香菇多糖,研究其对仔猪生产性能、部分血清激素及免疫指标的影响.120头(11.34±0.62)kg的长×大二元杂交仔猪,随机分为4组,每组设5个重复,每个重复6头猪.第1组为对照组,饲喂基础日粮,第Ⅱ、Ⅲ和Ⅳ组分别饲喂在基础日粮中添加150、300和450 mg/kg香菇多糖的试验日粮.试验期28 d.结果显示:添加香菇多糖能够显著提高仔猪试验0～14 d、14～28 d及试验全期的平均日增重(ADG)(P<0.05);试验各组的平均日采食量(ADFI)在试验0～14 d及试验全期均得到显著提高(P<0.05);而料重比(F/G)在各时期并没有显著降低(P>0.05).第Ⅱ组腹泻频率与第Ⅰ组相比下降了23.08%(P<0.05),第Ⅲ组和第Ⅳ组较第Ⅰ组各下降了53.85%(P<0.01).各试验组生长激素(GH)、三碘甲腺原氨酸(T3)及甲状腺素(T4)水平随香菇多糖添加量的增加而提高,皮质醇(Cor)水平下降,其中第Ⅳ组GH和T3水平极显著升高(P<0.01),而Cor则以第Ⅲ组下降最明显(P<0.01).试验各组血清IgM含量有所提高,但只有第Ⅳ组显著提高(P<0.05),而IgG和补体C4含量变化不显著(P>0.05).本试验结果表明,在仔猪日粮中添加300 mg/kg香菇多糖能够显著提高日增重和采食量,并且GH、T3水平显著提高,Cor水平显著下降,仔猪生产性能得到改善.     

不同锌源及水平对蛋鸡生产性能、蛋品质、血液生化指标以及蛋锌含量的影响

试验研究不同锌源及水平对蛋鸡生产性能、蛋品质、血液生化指标以及蛋锌含量的影响。选用21周龄健康的罗曼蛋鸡720只,随机分为5个处理,每个处理6个重复,每个重复24只鸡。对照组饲喂基础饲粮(锌含量测定值20.56 mg/kg),其他4组分别在基础饲粮中添加35、70 mg/kg的氨基酸络合锌(Av-Zn)或硫酸锌(锌含量实测值分别为40.11、80.39、36.62、76.10 mg/kg)。试验预试期7 d,正试期56 d。结果表明:(1)锌源之间对平均日蛋重和损蛋率差异显著(P<0.05);(2)锌源及水平对蛋壳重有显著影响(P<0.05);(3)不同锌源对蛋鸡血清锌离子、SOD活性以及Cu Zn-SOD活性均没有显著影响(P>0.05);不同水平的锌对蛋鸡血清锌离子有极显著影响(P<0.01)、对Cu Zn-SOD活性有显著影响(P<0.05),对SOD活性并没有显著影响(P>0.05);(4)锌源对第14、28、42、56 d蛋黄锌的影响差异显著(P<0.05);锌水平对第14、28、42 d蛋黄锌含量的影响差异不显著(P>0.05),但对第56 d蛋黄锌含量差异极显著(P<0.01)。锌源和锌水平之间对14、28、42、56 d蛋黄锌含量的影响差异不显著(P>0.05)。由此可见,添加70 mg/kg氨基酸络合锌能生产富锌鸡蛋,同时对蛋鸡的正常生产没有影响。     

饲料中维生素A水平对凡纳滨对虾生长、饲料利用、体组成成分及非特异性免疫反应的影响

本文旨在研究5种等氮等能饲料中,维生素A添加水平对凡纳滨对虾(Penaeus vannameiBoone)生长、饲料利用、体组成成分及非特异性免疫反应的影响。试验选用平均初始体重为(0.069±0.005)g的凡纳滨对虾450尾,随机分为5个处理组,每组90尾,每组设3个重复,每个重复30尾。试验采用单因素设计,以维生素A醋酸酯为维生素A源,用添加不同水平维生素A(添加量分别为0、18、365、4和72 mg/kg)的饲料喂养凡纳滨对虾,试验期11周。结果表明:在养殖前4周,饲料中添加维生素A显著促进凡纳滨对虾的生长(P<0.05),提高其对饲料利用效率(P<0.05),而对对虾的成活率不产生显著的影响(P>0.05);第11周的结果表明,饲料中添加维生素A并不能显著影响凡纳滨对虾的生长、饲料利用效率和成活率(P>0.05)。维生素A对对虾体脂肪、蛋白质含量的影响显著(P<0.05),对对虾体水分和灰分含量无显著影响(P>0.05)。维生素A对对虾血清中溶菌酶活力、酚氧化酶活力和血液红细胞数量的影响显著(P<0.05),饲料中未添加维生素A或过量添加(超过36 mg/kg)均导致血清中溶菌酶活力、酚氧化酶活力和血细胞总数显著下降(P<0.0 5),而对血清超氧化物歧化酶活力无显著影响(P>0.0 5)。用折线回归模型分析饲料维生素A添加量与对虾增重率的变化关系,表明在试验前4周,凡纳滨对虾饲料中维生素A的适宜添加量为2 2.5 0 mg/kg;1 1周试验期间,凡纳滨对虾饲料中维生素A适宜添加量为1 8 mg/kg;以溶菌酶、酚氧化酶活力为指标,凡纳滨对虾饲料中维生素A最适添加量为5 9.5 1 mg/kg。     

Influence of copper sulphate on the water and electrolyte balance of the freshwater snail Bulinus (Bulinus) tropicus

The water and electrolyte balance of Bulinus (Bulinus) tropicus, a freshwater pulmonate, was determined when subjected to different sublethal concentrations of copper sulphate. It was found that the lethal dose (LD₅₀), which is the dose lethal to 50% of the snails, is 1,0 ppm in water of pH 8,5. Increasing dosages disturb the ionic and water balance. Haemolymph concentrations of Na ⁺ , Ca²⁺ and Cl^- decrease markedly. The rates of ion influx and efflux for Ca²⁺ , Na ⁺ , Cl^- and ³H₂0, measured With their corresponding radioisotopes, were drastically changed. The results indicate that the physiological effects of copper are not limited to particular organs or tissues but probably occur throughout the snail body. The possible effect of copper sulphate on the in- tegumental exchange mechanisms for Ca²⁺, HCO3^-, Na⁺ , K⁺ and Cl^- are discussed.     

Effects of dietary cation-anion balance on blood PH, acid base parameters, serum and urine mineral levels, and parathyroidhormone (PTH) in weanling horses.

This study demonstrated that the feeding of treatment diets with calculated dietary cation-anion balances (DCAB) of +370.43 (H) and -25.69 (L) did not have significant effects on blood pH, pCO₂, and HCO₃-. Serum Ca²⁺, P, Na⁺, and Cl^- as well as plasma PTH did not differ (P > .05) between the two treatment groups. Serum K⁺ was higher (P< .05) in horses fed diet H rather than diet L. The DCAB of the diet significantly affected urinary Ca²⁺, P, Na⁺, K⁺, and Cl^- excretion in the young growing horse. Urine Ca²⁺ and Cl- levels were higher (P < .01) in horses fed diet H versus diet L. Furthermore, levels of P, Na⁺, and K⁺ in the urine were higher (P < .01) in horses on diet H as opposed to diet L. Results of this study indicate that horses were able to maintain acid-base status regardless of diet. However, these data imply that growing horses consuming diets low in DCAB may be predisposed to abnormal bone mineralization due to the increase in calcium excretion which could lead to a weakening of the skeletal system.     

Investigation into the durability of washed rice straw for equine bedding and the repetitive use of washing water

The present experiment investigated durability during the repetitive use of washed rice straw, as bedding material, and washing water as a model study. Residual nitrogen levels, elasticity, and water suction rates for washed rice straw‐adhered urea were measured. In addition, outflow levels of nitrogen and mineral ions (Na⁺, NO₂^‐ + NO₃^‐, SO₄^2?, PO₄^3?, Cl^‐) for washing water were measured to determine durability. Nitrogen levels of rice straw significantly (P < 0.05) decreased after two washings. There was no significant change in elasticity of repetitively used rice straw. Suction rates of rice straw after the second and third washings increased significantly (P < 0.05) compared to the first time. With regard to the number of washings, the mineral ion outflow level in the washing water for nitrogen, Na⁺, NO₂^‐ + NO₃^‐ and PO₄^3? after each washing was not significant. However, nitrogen outflow level tended to decrease after the third washing. SO₄^‐ and Cl^‐ did significantly decrease (P < 0.05) with the number of washings. In this study, it was considered that rice straw and washing water could be used repetitively three times. Furthermore, in order to maintain effluent standards, washing water from the first washing needs to be processed in a septic tank.     

The Level of Prolactin,Serum Amyloid A,and Selected Biochemical Markers in Mares Before and After Parturition and Foal Heat

The aim of the study was to determine the level of prolactin (PRL), serum amyloid A (SAA), and selected biochemical markers (T-Chol, AST, TP, Mg²⁺, P⁺, and Ca²⁺) in the blood of mares during the perinatal period. The study involved 14 mares of the Polish Coldblood Horse breed, which were in the third trimester of pregnancy. Blood was collected for testing 2 weeks before parturition and then 24 hours after delivery and in the foal heat (9 days) and 9 days after ovulation and breeding. The research revealed significant differences in the level of PRL and SAA before and after delivery. The highest PRL level was found 24 hours after delivery, lowest in foal heat and 9 days after ovulation. Serum amyloid A concentration was within the accepted norms; however, on day 9 after foaling, a significant increase of this protein was observed. All biochemical markers were within physiological limits. However, significant increases in T-Chol, AST, and TP levels was observed 24 hours after the delivery, whereas in foal heat and after ovulation levels of T-Chol and TP significantly decreased and the AST level remained at a similar level. There were no significant changes in electrolyte levels such as Mg²⁺, P⁺, and Ca²⁺. The pregnancy rate in the foal heat was at 43%. Collectively, the results of this study in conjunction with clinical observations demonstrated that when the perinatal period was normal, no disturbances in health related to pregnancy, parturition, lactation, and reproductive status during the postpartum period were found.     

全棉籽对奶牛生产性能及血清生化指标的影响

本试验旨在研究饲粮中添加全棉籽对奶牛生产性能及血清生化指标影响.试验采用4×4拉丁方设计,选择8头泌乳早期的经产中国荷斯坦奶牛,随机分为4组,每组2个重复,每个重复1头牛.A组为对照组,饲喂基础饲粮;B、C和D组分别饲喂含5％、10％和15％全棉籽的试验饲粮.共进行4期试验,每期试验28 d,其中预试期7d,正试期21 d.结果表明:1)随着全棉籽比例的增加,奶牛产奶量有提高趋势,奶牛的乳脂率和4％标准乳产量显著提高(P＜0.01),但全棉籽对乳蛋白率、乳糖率和乳非脂固形物率无显著影响(P＞0.05).2)全棉籽对粗蛋白质、粗脂肪、酸性洗涤纤维的表观消化率无显著影响(P＞0.05),但含有全棉籽饲粮的中性洗涤纤维的表观消化率均高于对照组(P＜0.05),其中C组比对照组提高了8.4％(P＜0.05).3)全棉籽对奶牛血清中白蛋白、血糖含量无显著影响(P＞0.05),对血清胆固醇和尿素氮含量影响显著(P＜0.05).C组奶牛血清中胆固醇含量显著低于其他各组(P＜0.01).B、C组的血清尿素氮含量显著低于对照组和D组.4)随着饲粮中全棉籽比例的提高,血清和乳中游离棉酚含量也显著提高(P＜0.01),乳中游离棉酚含量在各试验组间差异不显著(P＞0.05).结果提示,全棉籽在奶牛泌乳早期饲粮中的最适添加量为10％.     

Study of Sperm Concentration,Seminal Plasma Composition and their Physiological Correlation in the Persian Sturgeon,Acipenser persicus

The objectives of the present study were to determine ionic and organic composition of seminal plasma, sperm concentration and their relationships in the Persian sturgeon (Acipenser persicus). In this regard, ionic content (Na⁺, K⁺, Cl^?, Ca²⁺ and Mg²⁺) and organic content (total protein, glucose, cholesterol and triglyceride) along with sperm concentration were measured in 17 specimens of the Persian sturgeon. The seminal plasma contained 59.53 ± 2.56 mm /l sodium, 9.1 ± 1.42 mm chloride, 4.72 ± 0.3 mm potassium, 1.45 ± 0.075 mm calcium and 0.7 ± 0.072 mm magnesium. The following organic contents were found: total protein 0.11 ± 0.02 g/dl, glucose 22.18 ± 4.16 mg/dl, cholesterol 6.67 ± 1.04 mg/dl and triglyceride 15.2 ± 0.65 mg/dl. The mean sperm concentration was estimated to be 1.6 ± 0.12 (×10⁹ sperm/ml). A significant relationship was found between sperm concentration and K⁺ of seminal plasma (r = 0.533, p < 0.05). Significant correlations were observed between ionic contents: Na⁺ vs Cl^? (r = ?0.854, p < 0.01) and Mg²⁺ vs K⁺ (?0.583, p < 0.05). Also, level of triglyceride was negatively correlated with Mg²⁺ (r = ?0.503, p < 0.05). Presented data could be considered as a complementary study for developing special extenders and protectant solutions for improving artificial fertilization in this valuable species.     

Composition of seminal plasma and ovarian fluid in Ide Leuciscus idus and Northern pike Esox lucius

Seminal plasma (SP) and ovarian fluid (OF) plays an important role as storage media to prevent the activation of gametes both in vivo and under artificial conditions. The objectives of this study were to quantify gamete biochemistry and explore correlations among quantitative characteristics of SP, OF and sperm performance traits of Ide Leuciscus idus and Northern pike Esox lucius. Generally, Na⁺, K⁺ and Cl^? were found to be the most dominating ions, although concentrations of K⁺ were higher in SP, while Na⁺ and Cl^? concentrations were higher in OF for both species. Several significant correlations among the biochemical properties such as total protein, glucose, osmolality, cholesterol, K⁺, Ca²⁺, Cl^? and Mg²⁺ were observed for SP and OF. Total protein content of Ide SP was positively correlated with sperm activity traits (r ≥ .89, p ≤ .05), while K⁺ concentration was negatively correlated with sperm traits (r ≥ ?.89, p ≤ .05). Moreover, Ca²⁺ concentration in Northern pike SP was positively correlated with the percentage of sperm motility (r = . 98, p < .01). In conclusion, these results can be used to better understand the biochemistry of SP and OF, improve methods for short‐ and long‐term storage of gametes and standardize fertilization protocols.     

Physiological Changes in the Red Drum after Long-Term Freshwater Acclimation

Abstract

The effect of long-term freshwater acclimation on the blood and plasma ion composition of Red Drum Sciaenops ocellatus was investigated with the goal of elucidating the necessity of ion remediation. Four replicates (n = 50) of freshwater-acclimated (FW) fish (1.6 ± 0.2 g) were raised in 25-m³ tanks supported by 140,000 L of recirculating water. Four replicates (n = 50) of seawater (SW) fish groups were placed in 40-m³ offshore cages at 32–35 psu. Blood was collected from 100 fish (FW = 578 ± 50 g; SW = 686 ± 45 g) of each group (FW, SW) after 8 months of rearing. During the grow-out phase, the survival of FW and SW fish was 57.5% and 92.2%, respectively. The water ion composition (mainly the Ca²⁺/K⁺ [43%] and Ca²⁺/Mg²⁺ ratios [1%]) explained 56.6% of the plasmatic ion variability in the fish groups. Freshwater exposure produced significant reductions in osmolality and in several plasma indicators (Na⁺, Cl^?, and Mg²⁺); the K⁺ levels from FW fish were the most compromised parameter. The water Ca²⁺/Na⁺ ratio had a greater influence (44%) on the plasma chemistry parameters, mainly glucose and creatinine. Freshwater-acclimated fish had a higher percentage of hematocrit, hemoglobin, and red blood cells than SW fish, but the water quality explained only 12.5% of the blood parameter variability between the FW and SW groups. The results support the conclusion that Red Drum tolerates salinity variations and can adopt a relatively stable condition for short periods; however, the data suggest that Red Drum have only a limited ability to withstand a hyposmotic environment for long periods due to their limited ability in maintaining K⁺ concentrations without external supplementation. Freshwater environments with high Ca²⁺/Na⁺, Ca²⁺/K⁺, and Ca²⁺/Mg²⁺ ratios appear to be a chronic stress factor that should be considered in future experiments.

Received June 11, 2012; accepted March 17, 2013     

柠条锦鸡儿营养成分动态变化及其在绵羊瘤胃内的降解

本试验旨在研究内蒙古呼和浩特地区不同生育期柠条锦鸡儿营养成分的动态变化及其在绵羊瘤胃内的降解特性。分别于孕蕾期、开花期和结实期采集当年生柠条锦鸡儿嫩枝条,测定初水分后在65℃烘箱中烘干,测定常规营养物质含量;选用安装有永久性瘤胃瘘管的内蒙古小尾寒羊3只,采用瘤胃尼龙袋法评定不同生育期柠条锦鸡儿营养成分的瘤胃降解特性。试验结果表明:1)开花期和结实期柠条锦鸡儿的干物质(DM)和粗蛋白质(CP)含量显著高于孕蕾期(P<0.05);不同生育期柠条锦鸡儿有机物(OM)、粗脂肪和无氮浸出物含量无显著差异(P>0.05);结实期粗灰分含量显著高于孕蕾期和开花期(P<0.05);孕蕾期和开花期柠条锦鸡儿中性洗涤纤维(NDF)含量显著高于结实期(P<0.05),而酸性洗涤纤维(ADF)含量显著低于结实期(P<0.05);随着生育期的延续,柠条锦鸡儿木质素含量逐渐升高,开花和结实期显著高于孕蕾期(P<0.05);随着生育期的延续,柠条锦鸡儿钙含量显著提高(P<0.05),磷含量显著降低(P<0.05)。2)随着生育期的延续,柠条锦鸡儿DM的72 h消失率和有效降解率逐渐降低,开花期和结实期DM的有效降解率无显著差异(P>0.05);不同生育期柠条锦鸡儿CP的72 h消失率无显著差异(P>0.05),但有效降解率孕蕾期显著高于开花期和结实期(P<0.05);随着生育期的延续,柠条锦鸡儿OM和NDF的72 h消失率和有效降解率均显著降低(P<0.05);开花期和结实期柠条锦鸡儿ADF的72 h消失率和有效降解率无显著差异(P>0.05),但显著低于孕蕾期(P<0.05)。试验结果提示,结合不同生育期柠条锦鸡儿营养物质含量、饲草DM产量以及营养物质的瘤胃降解特性,开花期柠条锦鸡儿营养物质的利用效率最高,为最佳刈割时期。