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牦牛实验性棘豆中毒病理学研究 总被引：2，自引：0，他引：2
健康牦牛６头，随机分为毒草全量组（全量饲喂黄花棘豆和甘肃棘豆干草）、毒草半量组（棘豆干草和燕麦干草各半）和对照组（全量饲喂燕麦干草）。试验期间，定期称量体重和进行临床检查，４个月后，剖杀进行病理剖检、病理组织学及超微结构检查。试验发现，两实验组牦牛心、肝、肾、脑、脾及肠系膜淋巴结均有程度不同的病变，其中，小脑蒲肯野氏细胞，肝、肾实质细胞的空泡变性具有明显特征。电镜观察，空泡变性的细胞线粒体肿胀，嵴减少或消失呈空泡样。牦牛发生棘豆中毒的主要临床表现是体重明显降低。 相似文献
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旨在研究前列腺素家族中生殖领域鲜有报道的PGD2成员对单一环境下黄体细胞内分泌功能及其凋亡相关基因表达的影响，并解析其在黄体退化中的作用机理，为全面探析前列腺素家族成员的生物学作用提供新的理论依据。采集空怀母山羊黄体中期的卵巢组织，通过胶原酶II消化和胰酶差速离心法分离纯化以获得山羊黄体细胞。采用DMEM/F12进行离体培养，观察不同离体培养时间的黄体细胞生长状态；采用免疫组化法和细胞形态特征鉴定黄体细胞，将PGD2设置三个不同梯度确定其对黄体细胞作用效果的剂量依赖性关系。最后，通过PGD2最佳依赖性剂量处理黄体细胞，利用ELISA法检测黄体细胞的内分泌功能变化，流式细胞术测定黄体细胞的凋亡率及qRT-PCR/Western blot法检测凋亡相关基因mRNA/蛋白表达水平。结果显示，经突触素(synaptophysin, SYP)特异性表达蛋白鉴定，成功分离并获得了山羊原代黄体细胞。细胞形态实时观察和ELISA检测结果显示，离体培养5 d时黄体细胞胞质饱满、外形紧凑、形态清晰可见，并且黄体细胞的内分泌P4 相似文献
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甘肃棘豆对绵羊的毒性研究 总被引：13，自引：1，他引：12
本研究给５只绵羊饲喂甘肃棘豆草粉（８～１０ｇ／ｋｇ体重），以研究其对绵羊的毒性。试验羊于饲喂棘豆后的２０～２５天出现中毒的神经症状，并逐渐加重，主要表现为精神沉郁，目光呆滞，反应迟钝，喜卧，四肢无力，后躯麻痹，最后卧地不起，于５６～７０天内死亡。血液学检查发现ＳＧＯＴ和ＡＬＰ活性明显升高，ＲＢＣ和ＰＣＶ明显下降。主要病理学变化为神经细胞、胰腺泡细胞空泡变性，肝细胞、心肌细胞及肾小管上皮细胞颗粒变性，淋巴结中淋巴细胞减少，生发中心不明显等。 相似文献
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家兔实验性甘肃棘豆中毒的临床症状和病理形态学观察 总被引：1，自引：1，他引：0
将18只健康成年家兔随机分为3个组,每天分别按每千克体重1、5、10 g剂量饲喂甘肃棘豆,并观察临床症状。待连续饲喂120 d时,处死试验家兔,观察心、肝、肺、肾、大脑、小脑、淋巴结等组织器官病理形态学变化。结果表明,Ⅰ组实验家兔在整个试验期间没有出现明显异常表现,Ⅲ组实验家兔有1只怀孕母兔在试验第18天流产,Ⅱ和Ⅲ组实验家兔从第35天开始出现甘肃棘豆中毒症状。实验家兔病理形态学变化呈现剂量效应关系,随甘肃棘豆染毒剂量的增加而加重,镜检可见主要以肝、肾、脑细胞广泛性空泡变性为特征,特别是脑变化较明显。 相似文献
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宽苞棘豆对绵羊的毒性研究 总被引：4，自引：0，他引：4
按每公斤体重１０ｇ的剂量每日经瘤胃瘘管给４只绵羊投服宽苞棘豆粉，试验羊在１７～１８ｄ出现中毒症状，表现为精神沉郁，目光呆滞，反应迟钝，喜卧，对提耳应激表现为转圈运动或摇头或头抵地；２５～３０ｄ出现严重中毒症状，食欲明显下降，步态蹒珊，后肢无力，行走时后躯摇摆如醉，最后卧地不起等。整个试验期间（７～３５ｄ）血清ＡＫＰ、ＧＯＴ活性及ＢＵＮ含量显著升高，尿低聚糖排泄增加，而ＬＤＨ活性和血清钙、无机磷、氯、钾和钠没有明显变化。主要病理组织学改变为神经细胞和胰腺泡细胞空泡变性；肝细胞、心肌细胞、肾小管上皮细胞、肾上腺实质细胞的颗粒变性及空泡变性 相似文献
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为确定四川成都某羊场黑山羊发病的病原并探讨其病理变化特点，本试验观察了患病羊的临床症状及剖检变化，制备了其唇、舌、心脏、肝脏、脾脏、肺脏的病理组织切片，观察其病理变化；并对患病羊的口唇病料样品进行羊传染性脓疱病毒(CEV)F1L基因的PCR检测。剖检结果显示，患病金堂黑山羊口、唇出现大小不等的丘疹、溃疡和脓疱；心包积液、出血；肾脏、脾脏肿大、淤血。病理组织学检查结果显示，病变唇、舌部表皮棘细胞大量增生，棘细胞空泡变性、网状变性、气球样变性，胞浆内可见嗜酸性病毒包涵体；心肌细胞排列紊乱，心肌纤维肿胀，成纤维细胞增多；肝细胞水肿，空泡变性；脾淋巴鞘增厚，血窦扩张、充血；肺泡扩张、破裂，肺泡壁变薄。PCR检测结果显示，患病羊口唇病料样品扩增出大小为230 bp的F1L基因片段；测序后BLAST比对显示，该基因序列与GenBank中登录的羊传染性脓疱病毒F1L基因序列同源性达99%。上述结果表明，该羊场此次发病由CEV感染引起，且CEV主要侵害金堂黑山羊唇、舌部的上皮组织，并且可造成心肌细胞肿胀、肝细胞变性、脾窦充血、肺泡扩张等病理损伤。本试验结果为CEV的诊断与治疗提供了科学依据。 相似文献
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雏鸡实验性硒中毒的病理组织学研究 总被引：2，自引：0，他引：2
对１０日龄雏鸡实验性急性硒中毒的病理组织学变化进行了详细研究。结果表明，随着给药剂量增加，雏鸡出现急性中毒症状，病理剖检变化以胃肠道出血及心、肝、肾等器官变性、坏死及出血为主；病理组织学变化以肝、心、肾、肺、脑等器官实质细胞变性、坏死及组织内充血、出血与炎性细胞浸润为特征；超微病理变化表现为肝细胞、心肌细胞及肾小管上皮细胞核形不规则，染色体分布不均匀，线粒体肿胀、空泡化，内质网扩张。 相似文献
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对24只关中奶山羊采用“促卵泡素+前列腺素+孕酮”激素组合进行超排。依据不同的放栓处理,将其分为2组,每组12只。组Ⅰ在放栓后第15天早去栓,组Ⅱ在首次放栓后的第8天早换新栓,并于第15天晚去栓。结果表明:两组间平均黄体数和平均采胚数差异均不显著(P>0.05);两组间平均大卵泡数差异显著(P<0.05)。组Ⅰ有3只山羊发生未成熟黄体退化现象,2只伴有大卵泡;组Ⅱ有2只山羊发生未成熟黄体退化现象,且伴有大卵泡。对正常黄体和未成熟退化黄体的结构分析发现,未成熟退化黄体的特点是各种类型细胞萎缩,细胞间存在大量胶原纤维;大黄体细胞占优势,而小黄体细胞、成纤维细胞和上皮细胞很少见。 相似文献
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The present study examines the size distribution of the goat steroidogenic luteal cells throughout the oestrous cycle. Corpora lutea (CL) were collected after laparatomy on days 5, 10 and 16 of the oestrous cycle. Luteal cells were isolated from CL by collagenase digestion. Steriodogenic luteal cells were identified by staining of the cells for 3beta-hydroxysteroid dehydrogenase activity, a marker for steroidogenic cells. Luteal cells having steroidogenic capacity covered a wide spectrum of sizes, ranging from 5 to 37.5 microm in diameter. There was a significant increase in mean cell diameters (p < 0.01) as CL aged. The mean cell diameter on day 5 was 11.55 +/- 0.12 microm, which was significantly increased and reached up to 19.18 +/- 0.24 mum by day 16 of the oestrous cycle. The ratio of large to small luteal cells was 0.06:1.0 on day 5 of the oestrous cycle. This ratio increased to 0.78:1.0 by day 16 of the oestrous cycle. Luteal cell size on days 5, 10 and 16 of the oestrous cycle reached its maximum at 7.5, 10 and 35 microm in diameter, respectively. Development of CL is associated with an increase in luteal cell size in goats. It is likely that small luteal cells could develop into large luteal cells as CL becomes older during oestrous cycle in goats. 相似文献
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The present study examines anatomical and histological characteristics of tubular genital organs and its relationships with the reproductive state of 24 wild adult collared peccary (Tayassu tajacu) females. The tunica mucosa of the uterine tube presents a pseudostratified, intermittently ciliated columnar epithelium. The epithelial secretory cells of pregnant females and females in the luteal phase of the oestrous cycle became taller than the ciliated cells and showed abundant apical secretory blebs, whereas secretory cells of females in the follicular phase showed abundant mucous secretory activity (periodic acid-Schiff positive cells). The uterus is composed of two narrow and convoluted uterine horns, separated by the velum uteri, a small uterine body and a long and muscular cervix. The endometrial lining of both uterine horns and body is a monostratified, columnar ciliated epithelium. Pregnant females and females in luteal phase showed a more developed hyperplasia of the endometrial simple tubular glands than females in the follicular phase. The cervix presents interdigitated rows of mucosal prominences that project into the lumen, structures similar to pulvini cervicali, occluding the cervical canal. In pregnant females, the endocervical canal was filled by a viscous cervical secretion. Females in follicular phase presented a thicker vaginal epithelium than pregnant females and females in luteal phase. The present study suggests that the collared peccary female showed different histological features of the uterine tubes, uterus and vagina in accordance with the reproductive state of the females. 相似文献
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Rowe JD Tell LA Carlson JL Griffith RW Lee K Kieu H Wetzlich S Hallford D 《Journal of veterinary pharmacology and therapeutics》2010,33(6):605-609
Progesterone (P4)-impregnated intravaginal controlled internal drug-releasing devices (CIDRs) have been used worldwide for estrus synchronization in ruminants. CIDRs serve to place all treated animals in the luteal phase of the estrous cycle. The objectives of this study were to compare P4 concentrations in milk from normal reproductively cycling, CIDR-treated, and pregnant goats. CIDRs were placed in treatment goats on day 0 and removed on day 19. Milk was collected daily from day 0 to day 21 from control and CIDR-treated goats and for 5 consecutive days between 40 and 60 days of gestation from pregnant does. Milk P4 was plotted against time (in days) for each individual, and the area under the curve (AUC) was calculated as an estimate of total milk P4. The AUC(day 0-21) for control and CIDR-treated goats were 29.5 ± 11.9 and 33.7 ± 6.6 d·ng/mL, respectively (P = 0.77). The highest single-day and highest 5-day average P4 values for each animal were also compared among groups. Single-day peak P4 levels were 4.8 ± 1.5, 4.0 ± 1.0, and 6.0 ± 0.4 ng/mL for control, CIDR-treated, and pregnant goats (P = 0.42). The highest 5-day average P4 concentrations were 3.6 ± 1.3, 2.9 ± 1.8, and 4.2 ± 0.3 for control, CIDR-treated, and pregnant goats (P = 0.56). The results of this study show that intravaginal P4 CIDR devices inserted for 19 days in healthy goats resulted in milk P4 levels similar to or less than those endogenously produced during diestrus or pregnancy. 相似文献
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Weng Q Medan MS Ren L Watanabe G Tsubota T Taya K 《The Journal of reproduction and development》2005,51(2):247-252
In this study, we performed immunohistochemistry of cholesterol side-chain cleavage cytochrome P450 (P450scc), 3beta-hydroxysteroid dehydrogenase (3betaHSD), cytochrome 17alpha-hydroxylase P450 (P450c17), and cytochrome P450 aromatase (P450arom) in the corpus luteum and placenta of Shiba goats. The aim was to clarify the steroidogenic capability of the corpus luteum and placenta of Shiba goats. Ovaries containing corpora lutea were obtained from four adult Shiba goats during the luteal phase (day10; n=2) and pregnancy (90 and 120 days of gestation). Placenta was obtained from one Shiba goat on day 120 of gestation. The sections of the ovaries and placentae were immunostained using the avidin-biotin-peroxidase complex method (ABC) with polyclonal antibodies generated against steroidogenic enzymes of mammalian origin. All luteal cells expressed P450scc, 3betaHSD, P450c17 and P450arom. The distribution of P450scc, 3betaHSD, P450c17 and P450arom were not different during the luteal phase and pregnancy. P450arom showed a weak positive staining in late pregnancy (120 days). In addition, immunoreactions for P450c17 and P450arom were observed in syncytiotrophoblast of the placenta of one Shiba goat. These results indicate that, in Shiba goats, corpus luteum is not only an important source of progesterone but also has the ability to synthesize androgen and estrogen during the luteal phase and pregnancy. Also the placenta has the ability to synthesize androgen and estrogen in late pregnancy. 相似文献
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Lu Meng Chao Koji Takayama Yoshitaka Nakanishi Katsumi Hamana Mitsuhiro Takagi Chikara Kubota Toshiyuki Kojima 《Journal of veterinary science (Suw?n-si, Korea)》2008,9(1):95-101
The present experiment aims to examine the efficiency of estrus synchronization using progesterone and equine chorionic gonadotrophin (eCG) and to look at luteal function. During the non-breeding and breeding season, 5 adult female Korean native goats were injected intramuscularly with 2.5 ml of physiological saline as the control. A progesterone impregnated intravaginal sponge was then kept in the same goats for 10 days followed, after a week, by an intramuscular injection of 500 IU eCG. Five adult female Nubian goats were mated with a fertile buck during the non-breeding season. During the non-breeding season 2 of the 5 goats showed a normal estrous cycle (ranging from 18 to 21 days) and 3 a short estrous cycle (ranging from 3 to 6 days). During the breeding season the equivalent figures were 1 and 2. The major axes of the corpus luteum (CL) were measured by means of calipers built into the ultrasonography system, and the concentrations of plasma progesterone (P4) were determined by double antibody radioimmunoassay. The mean major axes of the CL in goats showing the short cycle (6.1 ± 0.5 mm) was significantly smaller than in those showing the normal cycle (8.9 ± 0.5 mm; p < 0.01) and also the value of P4 in goats showing the short cycle (4.2 ± 2.1 ng/ml) was significantly lower than for those showing the normal cycle (10.3 ± 4.3 ng/ml; p < 0.05) at day 3 following ovulation. Three out of 5 Nubian goats became pregnant but only one goat carried to full term. The present experiment indicated that a combination of progesterone and eCG was effective in inducing estrus, although it resulted in a high incidence of short luteal lifespan. The low kidding rate and high incidence of embryonic loss may be due to the instability of the luteal lifespan. 相似文献
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山羊GnRH和促性腺激素的释放特点 总被引：18，自引：1，他引：18
通过外科手术分别连续收集活体山羊中黄体期及早卵泡期的垂体门脉血样和外周血样，经放射免疫测定，山羊中黄体期和早卵泡期的促性腺激素释放激素（ＧｎＲＨ）、促黄体生成素（ＬＨ）和促卵泡素（ＦＳＨ）均呈波动式释放。在早卵泡期，ＦＳＨ单位时间内波动次数和血浆平均水平显著高于中黄体期；ＧｎＲＨ与ＬＨ的波动型基本一致，ＦＳＨ的变化不太规则。表明山羊垂体促性腺激素的释放受丘脑下部ＧｎＲＨ的调节，但ＦＳＨ似乎还存在其他调节机理。 相似文献
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Velez IC Pack JD Porter MB Sharp DC Amstalden M Williams GL 《Domestic animal endocrinology》2012,42(3):121-128
We tested the hypothesis that continuous infusion of native GnRH into mares during the estrous cycle, at a dose of 100 μg/h, would elevate circulating concentrations of LH without disrupting the endogenous, episodic pattern of LH release. Ten cyclic mares were assigned to one of two groups (n = 5/group): (1) Control (saline) and (2) GnRH in saline (100 μg/h). On experimental day 0 (3 to 6 d after ovulation), osmotic pumps containing saline or GnRH were placed subcutaneously and connected to a jugular infusion catheter. Blood samples were collected from jugular catheters daily and at 5-min intervals from catheters placed in the intercavernous sinus (ICS) for 8 h on experimental day 4 (luteal phase; 7 to 10 d after ovulation), followed by an additional 6-h intensive sampling period 36 h after PGF(2α)-induced luteal regression (experimental day 6; follicular phase). Treatment with GnRH increased (P < 0.001) concentrations of LH by 3- to 4-fold in the peripheral circulation and 4- to 5-fold in the ICS. Continuous GnRH treatment accelerated (P < 0.01) the frequency of LH release and decreased the interepisodic interval during both luteal and follicular phases. Treatment with GnRH during the luteal phase eliminated the low-frequency, long-duration pattern of episodic LH release and converted it to a high-frequency, short-duration pattern reminiscent of the follicular phase. These observations appear to be unique to the horse. Further studies that exploit this experimental model are likely to reveal novel mechanisms regulating the control of gonadotrope function in this species. 相似文献
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P. Mayor R. E. Bodmer L. Schettini G. O. Mariño M. López‐Béjar 《Anatomia, histologia, embryologia》2009,38(6):467-474
This study examined the anatomical and histological characteristics of the genital organs of the female white‐lipped peccary in the wild in different reproductive stages, collected by rural hunters in the North‐eastern Peruvian Amazon. Mean ovulation rate was 2.12 ± 0.83 follicles and litter size was 1.78 ± 0.41 embryos or fetuses per pregnant female, resulting in a low rate of reproductive wastage, averaging 0.33 ± 0.66 (16.04%) oocytes or embryos per pregnancy. The ovulation rate and the anatomical performance of the uterus could limit the prolificacy of this species. Females in follicular phase showed follicular waves suggesting the synchronous growth of a cohort of follicles. Different uterine and vaginal epithelium features changed in accordance with the reproductive state of the female. Pregnant females and females in the luteal phase presented a significant proliferation of endometrial uterine glands, characterized by hyperplasia and branching of endometrial glands, and increase in the proportion of cervical epithelial cells with periodic acid‐schiff (PAS)‐positive granules compared with that in females in the follicular phase. Females in the follicular phase showed a more developed vaginal epithelium (in thickness and in layer composition) than females in the luteal phase and pregnant females. 相似文献