共查询到20条相似文献，搜索用时 296 毫秒
1.
为了通过同期发情、超数排卵、人工授精等扩繁技术增加海南黑山羊种群数量,试验以发情、妊娠、哺乳、空怀四个时期的黑山羊母羊作为试验动物,采用酶联免疫吸附试验(ELISA)法对繁殖周期母羊血清中促卵泡素(FSH)、促黄体素(LH)、雌二醇(E2)、催乳素(PRL)、孕酮(P4)的含量进行测定,分析黑山羊母羊在整个繁殖周期中生殖激素的分泌规律。结果表明:FSH与LH分泌规律基本一致,整个繁殖周期中呈现先下降(发情期到妊娠期)后上升(哺乳期到空怀期)的趋势;进入妊娠期后E2分泌量减少,哺乳期过后分泌量逐渐恢复;各个时期PRL分泌变化不显著(P0.05);妊娠期P4分泌水平极显著高于非妊娠时期(P0.01)。说明海南黑山羊在繁殖周期中生殖激素的分泌有一定规律,可以作为扩繁新技术应用的理论依据。 相似文献
2.
《畜牧与兽医》2013,(6)
本试验旨在研究1～15月龄西农萨能羊血浆生殖激素和生化指标的变化规律。选取30只出生日期相近、体重相似的健康西农萨能羊母羔进行饲喂,每隔30天空腹颈静脉采血1次,以测定母羊自出生至妊娠、分娩中血浆4种生殖激素以及生化指标含量的变化。结果表明:哺乳期羔羊血浆雌激素、孕酮、卵泡刺激素、黄体生成素含量较低,此后逐渐上升;妊娠阶段母羊血浆雌激素、孕酮含量逐渐上升,卵泡刺激素、黄体生成素水平显著下降;分娩后试验羊血浆雌激素、孕酮释放水平逐渐下降,卵泡刺激素、黄体生成素含量略有上升。1～10月龄试验羊血浆总蛋白、白蛋白含量逐渐上升,妊娠阶段显著下降,分娩后有所回升。妊娠阶段试验羊血浆总胆固醇、甘油三酯、尿素氮水平急剧升高,分娩后逐渐下降。妊娠对试验羊血浆生化指标、生殖激素含量存在显著影响(P0.05)。生殖激素浓度变化规律可为奶山羊早期选种和高效扩繁提供试验依据。 相似文献
3.
奶牛产后的子宫内膜炎、乳房炎、肢蹄病等疾病主要通过影响排出卵子的质量和促性腺激素、妊娠早期子宫腺体的分泌状态而对繁殖功能造成影响。高产奶牛围产期的能量负平衡会造成体内胰岛素、胰岛素样生长因子-I、雌二醇、孕酮的分泌量减少以及LH的脉冲频率下降，从而影响卵巢的发育，对繁殖性能造成影响。早期胚胎的发育则易受到孕酮分泌量、胚胎生长速度、干扰素tau分泌量以及子宫PGF2α分泌状况的影响。此外，奶牛易受霉菌毒素以及细菌、病毒、寄生虫等传染性因素的影响而引发流产。 相似文献
4.
5.
6.
《黑龙江畜牧兽医》2015,(13)
为了揭示建昌黑山羊主要生殖激素在繁殖期不同阶段的分泌规律,试验选择12头建昌黑山羊健康母羊,分别于妊娠早期(妊娠1~90 d)、妊娠晚期(妊娠91~150 d)、泌乳期和空怀期采集血样,分离血清后采用酶联免疫法(ELISA)进行检测,根据标准回归方程得到繁殖期内各阶段雌二醇(E2)、孕酮(P4)、促卵泡激素(FSH)、促黄体素(LH)浓度。结果表明:雌二醇浓度在妊娠期达到峰值,分娩后急剧下降,空怀期比妊娠晚期下降了50.6%,差异显著(P0.05);孕酮浓度呈递减趋势,妊娠早期与空怀期相比差异显著(P0.05),妊娠早期与泌乳期相比差异显著(P0.05),空怀期和泌乳期比妊娠早期分别下降了44.9%和40.7%;促卵泡激素和促黄体素各时期相比均差异不显著(P0.05),两者变化规律一致。说明在建昌黑山羊繁殖周期中,雌二醇、孕酮、促卵泡激素、促黄体素对母羊妊娠、泌乳及间情等繁殖行为具有十分重要的作用。 相似文献
7.
8.
9.
10.
11.
【目的】 鉴于在多囊卵巢综合征(polycystic ovary syndrome，PCOS)发病机理和治疗方式上的诸多争议，以及使用人类PCOS材料进行研究的局限性，本研究通过构建PCOS小鼠模型以探究在模型构建过程中性激素水平的变化规律。【方法】 皮下注射脱氢表雄酮(dehydroepiandrosterone, DHEA)诱导昆明白雌鼠产生PCOS样临床症状，通过结晶紫染色查看小鼠性周期是否发生停滞；利用HE染色的方式确定卵巢发育状况；利用ELISA技术调查建模过程中血清睾酮和雌二醇浓度的变化规律。【结果】 使用结晶紫对小鼠阴道上皮细胞染色可准确区分小鼠各个性周期阶段；使用6 mg/100 g DHEA持续诱导20 d后，昆明白小鼠性周期循环发生了一定的停滞，且在建模过程中体重变化与芝麻油溶剂的加入呈显著相关(P < 0.05)，与DHEA处理无关；DHEA连续处理后可见卵巢中巨大囊状卵泡出现，血清睾酮水平出现显著升高(P < 0.05)；自PCOS模型构建的第5天起，血清睾酮水平显著上升(P < 0.05)，且维持到建模结束；而血清雌二醇水平出现了阶段性变化，在第10、15天均显著高于对照组(P < 0.05)，第20天时低于对照组。【结论】 改进DHEA溶解方式可成功构建昆明白小鼠PCOS模型，在建模过程中血清睾酮持续处于较高水平，而雌二醇水平呈现先增高后降低的趋势，后者在建模中期瞬时升高的病理意义需进一步研究。 相似文献
12.
Clay A. Cavinder PhD Martha M. Vogelsang PhD PAS Pete G. Gibbs PhD PAS David W. Forrest PhD PAS David G. Schmitz DVM 《Journal of Equine Veterinary Science》2007,27(2):72-79
The influence of progesterone, luteinizing hormone (LH), and estrogen on the mare's estrous cycle has been well researched and documented, but other endocrine profiles have not received as much attention. To evaluate endocrine concentrations in fat-conditioned (body condition score [BCS] of 7–8) versus moderately conditioned mares (BCS of 5–6), 24 mares were allotted to and maintained in respective groups from late gestation until pregnancy was confirmed after breeding on the second postpartum estrus. Serum concentrations of thyroxine (T4), insulin-like growth factor-1 (IGF-1), and leptin were assayed to characterize circulating blood concentrations. Additionally, LH and progesterone serum concentrations were assayed to evaluate the estrous cycle status of the mares. Leptin and progesterone concentrations were not different (P > .05) between the groups. Nevertheless, serum concentrations of T4 were higher (P < .01) and IGF-1 concentrations lower (P < .01) in moderately conditioned as compared with fat-conditioned mares during times of ovulation and the interovulatory period. Furthermore, serum concentrations of LH were found to be different between the groups only when the estrous cycle approached the second ovulation (P < .0001). Results of this study suggest that mares maintained in a BCS of 5 or greater are similar in terms of reproductive efficiency. Although the circulating serum concentrations of T4 and IGF-1 are different after parturition, their influence does not affect reproductive capabilities of mares with a BCS of 5 or greater. 相似文献
13.
牦牛不同妊娠阶段孕酮的主要来源器官研究 总被引：1，自引：1，他引：0
为明确牦牛不同妊娠阶段孕酮的来源，分别对53头不同妊娠阶段牦牛的黄体组织、肾上腺组织和胎盘组织进行体外细胞培养，同时对44头牦牛的上述组织进行匀浆处理，采用放射免疫分析法（RIA）测定培养液及组织匀浆上清液中孕酮的含量。结果显示，黄体细胞在体外培养时，妊娠前2个月内孕酮分泌量显著升高（P〈0．05）：妊娠2-5个月，培养液中孕酮含量变化不明显（P〉0．05），但在妊娠5个月以后，其浓度又开始显著增加（P〈0．01）。肾上腺组织体外培养时，分泌孕酮的能力随不同个体差别较大，孕酮浓度在整个妊娠期变化不明显（P〉0．05）。胎盘组织体外培养时仅分泌少量孕酮，且在整个妊娠期其浓度变化不明显。黄体组织匀浆上清液中孕酮浓度在妊娠前2个月内呈上升趋势（P〈0．05），之后其浓度开始下降，至妊娠第4个月时下降到最低水平，以后又逐渐上升（P〈0．05），妊娠6-7个月时达到峰值，临近分娩时，又下降至较低水平。肾上腺组织匀浆中孕酮含量的变化差异较大，且无明显的变化趋势，胎盘组织匀浆中孕酮的含量也很低，甚至检测不到。结果表明，黄体是牦牛整个妊娠期孕酮的主要来源器官。 相似文献
14.
Eleven multiparous Quarter Horse and Thoroughbred mares were used to determine the plasma concentrations of progesterone and prolactin during early pregnancy and to examine the relationship of plasma progesterone and prolactin to pregnancy loss prior to d 45 of gestation. Plasma samples were collected at two day intervals beginning on d 14 of pregnancy (d 0 = ovulation) and countinued to d 80. Ovulation and pregnancy status were determined by ultrasonography. Four mares experienced pregnancy loss between d 28 and 44 and plasma samples were collected for 10 days beyond the detected loss. Seven mares had successful pregnancies (Term group).Plasma progesterone concentrations peaked by d 28 in the Term group, with individual peak values ranging from 14.9 to 31.9 ng/ml. Values then declined until d 36, followed by a rise until d 80. Prior to d 45 of gestation 5 of the 7 mares had a peak in excess of 15 ng/ml and 3 of these had brief periods, ranging fron 1 to 8 days when progesterone dropped to less than 2 ng/ml. The other 2 mares had peak plasma progesterone concentrations of less than 7 ng/ml, but maintained concentrations in excess of 2 ng/ml during this period.Within the mares experiencing pregnancy loss, 2 mares had a decline in plasma progesterone concentrations prior to pregnancy loss, while the other 2 had typical progesterone patterns beyond the detected loss. Differences in individual patterns of plasma progesterone concentration were observed in both groups (P<.01).Plasma prolactin concentrations ranged from less than .32 to 4.58 ng/ml in the Term group and from .31 to 1.9 ng/ml in the mares experiencing pregnancy loss. Differences in the individual patterns of prolactin secretion were observed in both groups (P<.01).A correlation between progesterone and prolactin was observed in the Term group between day 14 and 37 (P<.01, r2=.88). 相似文献
15.
【目的】 本试验通过研究饲粮粗蛋白质水平对1~25日龄竹丝鸡生长性能、胴体性状和血清生化指标的影响, 探讨此阶段竹丝鸡粗蛋白质营养需要量。【方法】 选取1 625只1日龄竹丝肉公雏, 根据体重一致原则随机分入5个处理组, 每组5个重复, 每个重复65只, 5个处理组粗蛋白质水平依次为18.5%、19.5%、20.5%、21.5%和22.5%, 试验期25 d。于试验结束当天, 每个重复选取接近平均体重的2只鸡屠宰, 采集血液制备血清以及分割屠体, 测定胴体性状和血清生化指标。【结果】 ①饲粮粗蛋白质水平显著影响肉鸡料重比(F/G)(P<0.05), 且料重比随粗蛋白质水平的增加呈线性和二次曲线降低(P<0.05);粗蛋白质水平对肉鸡终末体重、平均日增重(ADG)、平均日采食量(ADFI)和成活率均无显著影响(P>0.05)。②粗蛋白质水平对肉鸡屠宰率、半净膛率、全净膛率、胸肌率、腿肌率和腹脂率均无显著影响(P>0.05)。③粗蛋白质水平显著影响肉鸡血清尿素氮(BUN)和胰岛素样生长因子1(IGF-1)含量(P<0.05), 且随着粗蛋白质水平的升高, BUN和IGF-1含量均呈线性和二次曲线升高(P<0.05)。【结论】 综合上述结果, 饲粮21.5%~22.5%粗蛋白质水平可改善肉鸡生长性能, 18.5%~21.5%粗蛋白质水平可调节氮代谢; 以料重比、血清BUN和IGF-1含量为评价标准, 根据二次曲线模型估测获得1~25日龄竹丝公鸡饲粮粗蛋白质最佳水平分别为23.18%、19.20%和22.62%。 相似文献
16.
17.
18.
19.
5种品系肉用仔鸡血清IGF-Ⅰ和甲状腺激素与生产性能相关性研究 总被引：3，自引：1，他引：2
为了对肉鸡选种选育提供科学依据,本研究选择5个不同生长速度的肉鸡品系,相同饲养条件下饲养8周,记录饲料消耗及生长速度,于第8周末宰杀,采集血清,放免测定法测定其中的IGF-Ⅰ、T3和T4浓度。结果表明生长最慢的烟霞鸡具有显著高水平的T3和显著低水平的IGF-Ⅰ以及显著低的全净膛率。动物的生长速度与血清IGF-Ⅰ水平呈现显著正相关,与血清T3水平呈现显著负相关。血清IGF-Ⅰ与T3水平呈现显著负相关。全净膛率与血清IGF-Ⅰ及T4水平呈显著正相关。肉鸡生长速度与血清IGF-Ⅰ及T3水平有密切关系,禽类生长发育的调节机制显著不同于哺乳类。 相似文献
20.
Association of increased estradiol and progesterone blood values with altered bovine polymorphonuclear leukocyte function 总被引：4，自引：0，他引：4
J A Roth M L Kaeberle L H Appell R F Nachreiner 《American journal of veterinary research》1983,44(2):247-253
Polymorphonuclear leukocyte (PMN) function and serum concentrations of estradiol, progesterone, and cortisol (hydrocortisone) were monitored concurrently in clinically normal cows during the estrous cycle. Five parameters were used to evaluate PMN function: (i) random migration under agarose, (ii) ingestion of 125I-labeled Staphylococcus aureus, (iii) nitroblue tetrazolium (NBT) reduction, (iv) iodination, and (v) antibody-dependent cell-mediated cytotoxicity. Increased serum estradiol concentrations were associated with enhanced random migration, but had no apparent effect on NBT reduction, iodination, or ingestion of S aureus by bovine PMN. Increased serum estradiol was also associated with increased serum cortisol. Increased serum progesterone values were associated with a depression of NBT reduction and iodination by PMN, but with enhanced random migration and antibody-dependent cell-mediated cytotoxicity. These results indicate that physiologic changes in steroid hormone values during the normal estrous cycle of the cow are associated with alterations in PMN function. 相似文献