β神经生长因子对蒙古马排卵的影响研究,兽医硕士论文.docx
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1、神经生长因子对蒙古马排卵的影响研究,兽医硕士论文在繁育季,从业人员对母马进行系统的繁育健康检查BSE,尤其是评估母马的发情鉴定和排卵机会对于提高受精率尤为重要。马的排卵经过受内分泌系统和神经系统共同调节。近年来,利用促排激素及合成类似物预测排卵的临床应用较为广泛,但我们国家地方马品种的具体超声应用、繁育健康检查、促排激素水平测定情况及排卵前优势卵泡直径阈值等相关数据信息严重缺乏。研究发现,作为神经营养因子家族的 神经生长因子Nerve growth factor-Beta,NGF- 不仅作用于神经系统,而且对生殖系统也有重要调节作用。NGF- 在水牛、鸡和绵羊等不同动物的颗粒细胞和卵细胞上均有
2、表示出,且在羊驼和骆驼精浆中作为主要诱排剂,但其在马繁育方面的应用仍很少。因而,从NGF- 角度初步讨论其促进蒙古马排卵的相关应用研究,具有一定的科学意义。 体内实验首先对94匹蒙古母马进行BSE,统计发现56匹母马排卵前48-72 h优势卵泡直径平均值为35.8 mm。其次,挑选出BSE正常的42匹年轻母马和2匹h CG耐受的母马,当优势卵泡到达35 mm,最后进行NGF- 促排应用+。华而不实NGF- 剂量及给药途径包括肌肉注射,静脉注射和子宫内灌注的挑选试验为NGF- 注射促排应用试验提供最佳给药方案。在NGF- 注射促排应用试验中通过比拟12匹母马n=3在四个发情期里肌肉注射0.5mg
3、 NGF- 、马精浆粗液、1.0 mg地洛瑞林和等量生理盐水后促排情况,另外2匹h CG耐受母马给予肌肉注射2000 IU h CG、0.5 mg NGF- 、1.0 mg地洛瑞林和等量生理盐水探究母马促排情况。母马促排应用的结果主要根据直肠超声检查监测卵泡排卵情况进行断定。 蒙古马血清中卵泡刺激素FSH、黄体生成激素LH及NGF- 含量的测定试验、马精浆蛋白SDS-PAGE试验、马输卵管NGF- 及其受体Trk A免疫组化试验和NGF- 促进蒙古马卵母细胞体外成熟的体外试验,以体外培养原代蒙古马卵丘-卵母细胞复合体COC为切入点,添加50 ng/m L NGF- 处理后评估卵母细胞体外成熟培
4、养情况。体外实验讨论蒙古马的内分泌激素规律以及正常排卵指标,研究NGF- 能否存在于蒙古马输卵管和精浆中,以及能否促进蒙古马卵细胞成熟。 NGF- 剂量及给药途径的挑选试验结果显示1.0 mg和0.5 mg剂量给药组中除子宫内灌注组外,其余实验组促排率达100%P 0.01。最适NGF- 剂量为0.5 mg,给药途径为肌肉注射,为NGF- 注射促排应用试验最佳给药方案。结果表示清楚:蒙古母马优势卵泡到达35 mm后,经肌肉和静脉途径注射等剂量NGF- 促排效果无明显差异,均促排良好。0.5 mg NGF- 与常规Gn RH冲动剂类似物地洛瑞林相比促排效果相近。NGF- 具有作为母马促排剂的潜力
5、且对耐受h CG母马促排有效,但蒙古马精浆粗液及子宫输注NGF- 促排效果差。研究发现蒙古马精浆中存在NGF- 。NGF- 及其受体Trk A在发情期和间情期的蒙古马输卵管上均有表示出,且发情期表示出量高于间情期。由于仅一个马卵母细胞培养成熟,该部分没有能作为结论。 本研究阐述和实操的母马繁育健康检查BSE对从业人员进行马繁育临床实操具有重要的意义。描绘叙述蒙古马的内分泌激素以及正常排卵指标,对马的基础繁育生物学的知识有所奉献。探究活性NGF- 能否有潜力成为马促排卵剂,为后续开发兽药、诊疗,尤其对h CG耐受母马的诊疗应用以及后续马繁育研究开展提供一定程度的参考价值。 本文关键词语: 神经生
6、长因子,母马促排,繁育健康检查,排卵预测,繁育直肠超声应用。 Abstract The Application of Nerve Growth Factor-Beta in Promoting Ovulation of Mongolian Mares The importance of breeding soundness examination (BSE), especially evaluates the estrus and ovulation timing of mares for breeders in breeding seasons can never be underestim
7、ated, particularly when it comes to increasing fertilization rates. Ovulation process is regulated by endocrine system and nervous system. The effects of hormones in endocrine system on mare s ovulation have been fully studied, so was the clinical application of hormones on accurately predicting ovu
8、lation. However, specific to the local equine breeds in China, the detailed ultrasonic application of BSE of hormone levels and the pre-ovulation follicle diameter threshold were rarely systematically described. Nerve growth factor-Beta (NGF- ) is a part of the neurotrophic factor family. In recent
9、studies, NGF- has been found to act not only on nervous system, but also on reproductive system. It was expressed on granulosa cell and oocyte in different animals, such as buffaloes, chicken, and sheep. NGF- is a major component of alpaca seminal plasma and induces ovulation in female alpacas and c
10、amelids, but there is still very little research on equine; Therefore, based on previous research, the research was significantly conducted to pilot explore the application of NGF- in promoting ovulation of mares. In vivo experiments were carried out on Mongolian mares by using BSE and NGF- promotin
11、g ovulation application (+). Breeding soundness examination (BSE) of 94 Mongolian mares was conducted, and the average 35.8 mm value of 56 mares of the dominant follicles, 48 to 72 hours before ovulation was calculated. Forty-two young mares with normal BSE results and 2 h CG-tolerant mares were sel
12、ected as the main subjects of NGF- promoting ovulation application (+) . In the pilot study(),when the mare dominant follicles reached 35 mm, Pre-examination of different administration routes (intramuscular injection, intravenous injection, and intrauterine infusion) and dosage of NGF- was performe
13、d in groups and provided the best dosing regimen for the NGF- injection application experiment (). In the experiment of NGF- injection application (), when 12 follicles (n=3/group) of the mare reached35 mm, they were intramuscularly administered with stallion crude seminal plasma,0.5 mg NGF- , 1.0 m
14、g deslorelin and equivalent amount of 0.9% saline to promote ovulation during four estrus cycle. To study their ovulation, the other two h CG-tolerant mares were injected with 2000 IU h CG, 0.5 mg NGF- , 1.0 mg deslorelin and equivalent amount of 0.9% saline. The results were judged by rectal ultras
15、ound monitoring of follicular ovulation. In vitro experiments were the determination of the follicle stimulating hormone (FSH), luteinizing hormone (LH) and NGF- in Mongolian mare s serum, the SDS-PAGE test of stallion crude seminal plasma protein, NGF- of mare fallopian tube Trk A immunohistochemis
16、try test and NGF- promoted Mongolian horse oocyte maturation test in vitro which using the primary Mongolian horse cumulus-oocyte complex (COC) cultured in vitro, after adding 50 ng/m L NGF- assess the maturation of oocytes. In vitro experiments explored the endocrine hormone law and normal ovulatio
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