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1998～1999年测定了中国美利奴军垦型细毛羊正常繁殖周期中血清N-乙酰-β-D-氨基葡萄糖苷酶(NAG)活力与孕酮(P4)浓度,并探讨了它们与发情排卵的关系.结果表明,母羊在休情期的NAG活力为26.98U/L±1.65U/L,P4平均含量小于0.1ng/ml.发情排卵当天(0天)NAD活力为51.12U/L±5.43U/L,P4平均含量为0.236ng/ml±0.07ng/ml.发情后1天(+1天)NAG活力为38.35U/L±3.78U/L,P4平均含量为5.256ng/ml.经t检验,0天和+1天的NAG活力和P4含量差异十分显著(P＜0.01).提示NAG活力变化可以作为简便、快速预测母羊发情排卵的指标. 相似文献
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采集湘西黄牛母牛的血液样品,通过酶联免疫吸附技术检测和比较其在发情周期和早期妊娠期的孕酮(P4)水平。结果表明,湘西黄牛的发情周期中,P4浓度变化非常明显,大致呈先上升再下降的趋势。发情前期、中期、后期和间情期P4浓度分别为8.85、0.72、1.40和9.13ng/mL,发情中期与后期P4浓度显著低于发情前期和间情期(P0.05);妊娠早期的母牛,从发情配种后,血液中P4浓度缓慢升高,其中妊娠后0~10d、11~20d、21~30d和31~36dP4浓度分别为3.36、8.91、12.69和16.12ng/mL,各阶段P4浓度差异显著(P0.05);发情后第21d、24d、27d和30d,妊娠母牛血液中的P4浓度显著高于未妊娠的母牛(P0.05)。试验表明,发情配种后20d,妊娠母牛与未妊娠母牛的血液中孕酮含量差异明显,可作为判断是否受孕的标记因子。 相似文献
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《养殖与饲料．饲料世界》2020,(9)
本试验从15只处于发情前期母犬中随机选取6只母犬,检测其促黄体生成素(LH)、促卵泡素(FSH)和孕酮(P4)3种激素,实现对母犬发情期连续的监测过程。采用静脉采血,抗凝低温离心后分别测定促黄体生成素(LH)、促卵泡素(FSH)、孕酮(P4)的含量,促黄体生成素采用人促黄体生成激素放射免疫分析药盒的方法测定,促卵泡素采用人促滤泡激素放射免疫分析药盒的方法测定,孕酮采用孕酮放射免疫分析药盒的方法测定。测定结果显示:母犬发情期的促黄体生成素的变化范围为5.16～6.82 ng/mL(除峰值外),其峰值平均值是116.71ng/mL;母犬发情期的促卵泡素的变化范围为3.18～4.78 ng/mL(除峰值外),其峰值平均值是43.56 ng/mL;母犬发情期的孕酮的变化范围为0.199 1～8.506 3 ng/mL,其峰值平均值是8.506 3 ng/mL。母犬在发情时,可出现LH释放波,并在LH开始释放后24 h内或开始发情的1～2 d内排卵。 相似文献
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银狐繁殖期血浆主要激素变化及其对繁殖功能的调控 总被引：3，自引：1，他引：2
通过放射免疫测定技术测定母银狐发情前期和发情期外周血浆雌二醇-17β[E2]、孕酮(P4)浓度以及公狐睾酮(T)浓度,并分析这些技术的变化及其对繁殖功能的调控.结果表明,银狐初配前2～3d,E2浓度达峰值(240.85±39.98)pg/mL,在母狐接受跨时E2浓度降至(146.95±38.21)pg/mL,而在发情前期和发情期,其孕酮浓度范围是0.91～77.43ng/mL,峰值是(54.77±23.66)ng/mL,在雌二酮峰值时,孕酮浓度为(28.57±21.21)ng/mL,配种时,P4浓度(33.12±22.56)ng/mL,初配后4d(排卵结束),P4达(48.28±34.84)ng/mL.公狐配种期,T浓度范围(127.2±444.4)pg/mL,,峰值是(341.2±103.2)pg/mL. 相似文献
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2005年10～l1月在新疆兵团79团使用PMSG和氟孕酮阴道海绵栓处理哈萨克羊和细毛羊母羊131只,进行腹腔内窥镜冻胚移植试验.结果表明,哈萨克羊同期发情率为90.62%,细毛羊同期发情率为84.7%,哈萨克羊同期发情率显著高于细毛羊(P＜0.05);借助腹腔镜观察母羊排卵情况,哈萨克羊与细毛羊排卵率分别为94.28%、95.08%,排卵率差异不显著(P＞0.05);利用腹腔内窥镜进行冻胚移植,结果为哈萨克羊产羔率44.89%(22/49),细毛羊产羔率38.63%(17/44),产羔率哈萨克羊与细毛羊间差异极显著(P＜0.01). 相似文献
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[目的]对广西水牛发情周期唾液和血液中雌激素(E2)和孕酮(P4)的浓度变化规律及相关性进行了分析,为进一步探讨水牛发情规律来指导生产提供依据。[方法]采用酶联免疫分析方法(ELISA)测定发情母水牛血液和唾液中E2(雌二醇)和P4(孕酮)的浓度变化,并对血液和唾液的激素变化规律进行了相关性分析。[结果]广西水牛血液和唾液中的E2和P4呈波动性变化,结果表明,发情前期,唾液中P4浓度一直维持在6.57.1ng/mL,第13天达到11.09ng/mL以上,随后快速下降。唾液中E2浓度在发情前期第35天出现一个峰值178.528pg/mL,在1417d唾液中E2浓度显著升高,出现第二个峰值达到120.57pg/mL。唾液E2和P4浓度的变化趋势和血清E2和P4浓度的变化趋势基本一致,相关性较好。母水牛唾液和血清样品的P4浓度相关性显著(R=0.4080;P0.05),母水牛唾液和血清标本的E2浓度相关性显著(R=0.5113;P0.05)母水牛唾液E2和P4浓度相关性非常显著(R=0.7754;P0.01)。[结论]唾液和血液中的这两种激素水平起伏变化基本趋于一致,其相关性显著,可以作为监测水牛发情及预测排卵的可靠指标之一。 相似文献
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《中国畜牧杂志》2021,(6)
实验旨在研究海绵孕酮栓+PMSG(孕马血清促性腺激素)法处理对贵州半细毛羊和威宁绵羊同期发情效果的影响。选择健康、空怀、2～4胎的贵州半细毛羊和威宁绵羊母羊各60只,每个品种随机分为2组,并分别采用海绵孕酮栓+PMSG(330 IU和500 IU)法于2020年3月底进行同期发情。结果表明:威宁绵羊+500 IU PMSG组的同期发情率(90.00%)极显著高于其他3组;从发情集中度来看,贵州半细毛羊+330IU PMSG组发情延迟时间最长,到撤栓注射后60 h发情,且贵州半细毛羊+330 IU PMSG组和贵州半细毛羊+500 IU PMSG组开始发情时间较为分散,各发情集中时间之间差异极显著,威宁绵羊+330 IU PMSG组和威宁绵羊+500 IU PMSG组则相对集中在12 h和36 h发情,但是各发情集中时间之间也差异极显著;从发情持续时间来看,各试验组都集中于0～24 h,该区间的分布量显著高于其他时间段。在本实验条件下,埋置海绵孕酮栓13 d后撤栓并注射500 IU PMSG处理威宁绵羊同期发情率最理想,可在生产实践中推广应用。 相似文献
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牦牛发情集中在7月中旬至9月下旬。发情周期平均20.95±5.13d。发情持续时间在24h以内的占69%超过1d的占31%最长可达96h。发情率为66.7%(n=225),其中空怀牛和带犊牛分别为92.1%和50%。未带犊牛发情期17-β雌二醇平均为231±100pg/mL,黄体期孕酮平均为0.43±0.07ng/mL。每日挤乳1次的带犊牛,孕酮及17-β二醇分别为0.26±0.08ng/mL和61±26.0pg/mL。 相似文献
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对生活在海拔 2 2 6 0m的青海细毛羊和海拔 2 5 0 0m的青海半细毛羊血清中NO和NOS进行了测定 ,结果为 :5 0 0 0 μmol/L± 12 71μmol/L和 30 83μmol/L± 2 1 31μmol/L ;2 0 5 0u/mL± 2 4 4u/mL和 19 5 7u/mL± 4 6 5u/mL。青海细毛羊的血清NO含量显著高于半细毛羊 (P <0 0 5 ) ,NOS在两种羊中无显著差异 (P >0 0 5 )。 相似文献
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本研究旨在探明水牛唾液生殖激素、唾液结晶和卵泡发育变化的规律。应用ELISA试剂盒测定水牛唾液和血清中的生殖激素,制作唾液结晶,并分析生殖激素和唾液结晶与卵泡变化的关系。运用唾液结晶法、直肠检查法、唾液结晶+B超法、直肠检查+B超法4种方法在生产中进行验证。结果表明,水牛发情当天唾液雌激素（E2）的水平为233.51 pg/mL,达到一个峰值,随后开始缓慢降低。水牛唾液中孕激素（P4）水平在发情前2 d达到16.17 ng/mL,发情当天降到8.91 ng/mL。促卵泡素（FSH）在水牛发情前2 d逐渐下降,从37.91 ng/mL降到34.64 ng/mL,但在发情2 d后逐渐升高,达到61.20 ng/mL。促黄体素（LH）在发情前1 d逐渐下降,从5.15 ng/mL降至发情当天4.12 ng/mL,但在发情1 d后升至5.77 ng/mL。B超监测卵巢卵泡从发情前2 d迅速生长,到发情当天达到20 mm大小,直到破裂排卵卵泡的大小变化不显著。排卵后形成黄体,黄体期一直维持到下次发情前4 d左右,期间在发情后14~17 d的黄体最大,与水牛唾液中LH分泌峰一致。唾液结晶+B超鉴定方法判定的发情率最高（86.67%）,与其他几种方法比较差异显著（P<0.05）;妊娠诊断结果也表明,唾液结晶+B超鉴定方法判定的妊娠率（61.53%）显著高于直肠检查法、唾液结晶法和直肠检查+B超法3种方法鉴定的结果（P<0.05）。综上所述,卵巢上卵泡的发育与唾液中生殖激素的浓度显著相关,发情当天唾液结晶呈现典型的树枝状,唾液结晶+B超法的发情鉴定准确率最高。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献