共查询到19条相似文献,搜索用时 203 毫秒
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本研究应用盐酸山莨菪碱(150mg)及微量的雌激素(4mg)对1~4胎90天以上未出现发情的不孕奶牛45例进行催情,其有效率为71.11%(32/45),其中卵巢静止为60%(15/25),持久黄体85%(17/20)。同时还发现用上述两种药物处理的10例患牛的血清孕酮含量在注射后的120小时以内均有程度不同的下降;当血清孕酮最低峰值<1.0ng/ml时,临床呈现发情征象的持久黄体牛为83.3%(5/6);卵巢静止牛为100%(4/4)。5例仅用微量雌激素(4mg)注射的患牛孕酮含量虽有变化但临床上均不出现显性发情症状。初步证明:盐酸山莨菪碱与微量雌激素协同可对奶牛有明显的催情作用,此方法迄今国内外未见报道。 相似文献
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牛人工授精后血清中孕酮浓度的变化与受胎效果 总被引:2,自引:1,他引:1
笔者通过对授精当天、7天后和20~22日后牛体血清中孕酮浓度的测定(酶免疫法)与分析,探讨了该法应用于牛的发情鉴定和早期妊娠诊断的可能性。在52头供试牛中,有47头(90.4%)属正常发情(排卵性发情),有1头(1.9%)属假发情(不排卵性发情),另有4头(7.7%)未发情,60天后妊检结果,有36头(69.2%)怀孕,这36头牛均为正常发情者。输精后第7天血清中的孕酮浓度,妊娠牛(n=36)与非妊娠牛群(n=16)间无显著差异,但在第20~22天后的第二次发情预计日,妊娠牛的孕酮浓度[5.3±1.7(1.2-8.2)ng/ml]则显著高于非妊娠牛[1.3±1.2(0.4-5.5)ng/ml]。采用此时血清中孕酮浓度指标,判定有40头牛妊娠,其早期妊娠诊断的准确率在妊娠牛为90.0%(36/40),对非妊娠牛达100%(12/12)。因而,本法在早期妊娠诊断上具有实用价值。 相似文献
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王少飞 《江西畜牧兽医杂志》2000,(5)
氯前列烯醇,对奶牛持久黄体、卵巢机能不全、萎缩,黄体囊肿等的治疗,效果甚佳。1 持久黄体:子宫腔注射2~4mL,在3~5d内发情,发情率达100%;在存在黄体的卵巢同侧阴唇膜下注射2~4mL,效果更好。该激素由子宫静脉通过渗透作用而进入卵巢动脉,作用于黄体,使黄体迅速溶解,加快了奶牛的发情。2 卵巢机能不全,萎缩:子宫腔注射或肌肉注射2~4mL。虽发情时间较肌注延缓3~5d,但发情率和受胎率有明显提高。3 黄体囊肿:子宫腔注射或肌肉注射4~6mL。该激素通过促进孕酮的降解和抑制孕酮的合成,进而破坏… 相似文献
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本文应用不同给药途径的15甲基前列腺素F2α(15甲基PGF2α)和乙烯雌酚注射液对100例患有持久黄体的奶牛进行疗效的比较,结果表明,有黄体存在的卵巢侧的阴辱粘膜下注射15甲基PGF2α2mg(试验1组)效果最佳,治愈率为90%(18/22),有效率为10%(2/20);有黄体存在的卵巢侧的子宫角注射15甲基PGF2α2mg(试验2组),治愈率(18/20)和有效率(2/20)同试验1组;肌注15甲基PGF2α4mg(试验3组)的治愈率为70%(14/20),有效率为30%(6/20);每日肌注1次乙烯雌酚注射液35mg,连续注射2天(试验4组),治愈率为60%(12/20),有效率为40%(8/20);每日在有黄体存在的卵巢侧的阴唇粘膜下注射1次乙烯雌酚注射液35mg(试验5组),连续注射2天,治愈率为80%(16/20),有效率为20%(4/20)。试验1组、2组与试验3组比,差异极显著(P<0.01);试验5组与试验4组比,差异亦为极显著(P<0.01);试验4组与试验3组比和试验5组与试验1、2组比,差异均为不显著(P>0.05)。 相似文献
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选择患持久黄体的不孕奶牛14头进行复方素乳剂的临床治疗试验,并利用放射免疫方法对部分患牛治疗关后血清孕酮(P4)和雌二醇(E2)水平进行检测。结果发现:复活 方缩宫素对持久黄体性不孕奶牛的有效率和治愈率均为77.78%,显著高于对照组;患牛在处理后血中E2水平不断升高,P4水平逐渐降低,这些结果表明,复方缩宫素具有溶解黄体和诱导发情的作用。 相似文献
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氯前列烯醇(ICI)在奶牛中 ,一般用于同期发情 ,调整产犊季节 ,治疗持久黄体等不孕症。多年来 ,在奶牛业生产中我们采取肌肉注射ICIO.2mg/头 ,诱导同期发情 ,于注射后48~72小时观察 ,发情率达到60 %。为了比较同期发情效果 ,1996~1999年采取子宫灌注ICIO.2mg/头、0 3mg/头 ,于子宫灌注后48~72小时观察 ,同期发情率分别达到71 6 %、87 5 %。1材料与方法1.1药品ICI0 2mg/支 ,批号950305970326980514上海计划生育研究所生产1.2方法直肠检查空怀奶牛 ,… 相似文献
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<正> 卵巢静止常出现在乏情的牛,它没有排卵周期,又没有发情表现。其病因较为复杂。虽然用西药有时也能奏效,但长期使用孕酮素或雌激素治疗会产生副作用,也能引起卵巢静止。临床上患卵巢静止的奶牛为数不少,如不及时发现和治疗,给生产带来一定 相似文献
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复方藿阳促孕汤加减治疗奶牛不孕症 总被引:5,自引:0,他引:5
本次试验以复方藿阳促孕汤为基础进行加减,组成方一、方二、方三,对持久黄体、卵巢静止、卵巢囊肿、卵巢萎缩、子宫疾病进行分组治疗。试验结果表明,持久黄体试验牛发情排卵有效率为96.6%,配种受胎率为88.9%;卵巢静止试验牛发情排卵有效率为80.8%,配种受胎率为80.0%;卵巢囊肿试验牛发情排卵有效率为75.0%,配种受胎率为42.9%;卵巢萎缩试验牛发情排卵有效率为50.0%,配种受胎率为50.0%:子宫疾病试验牛发情排卵有效率为77.8%,配种受胎率为833%。由此说明,复方藿阳促孕汤加减在治疗奶牛不孕症中效果显著。 相似文献
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三个不同牛场的37头发情期瘤牛,经一次前列腺素PGF2α处理,进行同期发情试验,60.6%的有显发情,90.5%的牛黄体溶解,一次注射PGF2α后定时授精的1号牛场妊娠率为61.4%,明显高于2,3号牛场的45.7%和46.9%,三个场重配牛的妊娠率分别为53.3%,50.0%和50.0%,三者没有显著差异。以孕酮(P4)浓度作繁殖力分级表明:6.6%的牛被误诊有黄体存在,其中2.9%黄体溶解不完 相似文献
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Zulu VC Sawamukai Y Nakada K Kida K Moriyoshi M 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2002,64(10):879-885
The relationship among nutritional status, systemic insulin-like growth factor-I (IGF-I) and ovarian function early postpartum were investigated. A total of 27 Holstein-Friesian cows, 10 that cycled normally within 20 days postpartum, 5 diagnosed with follicular cysts, 8 with persistent corpus luteum (CL) after the first ovulation postpartum and 4 with inactive ovaries were used for the study. Blood samples were collected 1-3 times per week, for 60 days pre- and postpartum, for IGF-I, progesterone, estradiol, free fatty acids (FFA), blood urea nitrogen (BUN), and aspartate aminotransferase (AST) determination. Inactive ovary and cystic cows had a higher body condition score before calving and lost more condition than normal or persistent CL cows. Immediately postpartum, IGF-I levels were higher and rose sharply in cows that cycled normally than in cystic, inactive ovary or persistent CL cows. At calving and early postpartum, FFA was higher in inactive ovary and cystic than in normal and persistent CL cows. There was a significant strong positive relationship between IGF-I and BUN, and strong negative relationships between IGF-I and FFA and AST in all groups. There was a positive relationship between serum IGF-I and estradiol in normal cystic and inactive ovary cows. This study found that overconditioned cows during the dry period or at calving, lost more body condition postpartum. These cows also had a deeper and longer period of negative energy balance (NEB), poor liver function and low circulating IGF-I concentrations early postpartum. Such cows were likely to have poor reproductive function as seen in development of cystic ovaries, persistent CL and inactive ovary. Changes in serum IGF-I early postpartum may help predict both nutritional and reproductive status in dairy cattle. 相似文献
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内蒙古地区奶牛病毒性腹泻/黏膜病血清流行病学调查 《畜牧与饲料科学》2014,35(3):106-106
应用ELLSA试验对来自内蒙古地区17个大﹑中﹑小型奶牛场的2391份牛血清样品进行了牛病毒性腹泻/黏膜病抗体检测,并对其中222份抗体阴性牛应用ELISA试验进行牛病毒性腹泻/黏膜病的抗原检测。结果表明:17个奶牛场均检出BVDV抗体阳性,共检出阳性血清2125份,阳性率最高达100%,最低为46.8%,平均为88.9%。对14个奶牛场进行了BVDV抗原检测,在5个奶牛场检出BVDV抗原阳性,阳性率为3.6%(8/222)。表明内蒙古地区奶牛场普遍存在牛病毒性腹泻/黏膜病感染,感染率较高,并且牛群中存在持续性感染(PI)牛。 相似文献
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Scott E. Poock Pedro Melendez Monica O. Caldeira Stephen G. Moore Lauren M. Mayo Roger Molina-Coto Matthew C. Lucy 《Reproduction in domestic animals》2020,55(8):915-921
Uterine and cervical size of Holstein dairy cows is reported among reasons for a decline in dairy cow fertility. Therefore, the objectives of this study were to (a) determine whether size of the cervix and uterus at 4 weeks postpartum impacted subsequent fertility at first service in Jersey cattle, (b) determine whether progesterone level at 4 weeks postpartum impacted cyclicity and (c) the association of the presence of corpus luteum and uterus and cervix size. Body condition scores at calving, presence of postpartum diseases, parity number and milk weights were taken from lactating Jersey dairy cows (N = 147) for 28 days postpartum. During the fourth week postpartum, a blood sample was obtained for progesterone concentration, and transrectal ultrasonography was performed by a high-resolution ultrasound machine to determine cervical and uterine horn diameter, as well as ovarian structures measurements. Correcting for parity number, BCS at calving, presence of diseases and milk yield, cows with a cervix >2.54 ± 0.63 cm and uterine horn >2.25 ± 0.59 cm were less likely to become pregnant at first service (p = .04 and p = .003, respectively). The cows with larger cervix had a trend to be less likely to have a corpus luteum present at the 4th week of lactation (p = .067). Cows with larger uterine horn size were less likely to have a corpus luteum present at the 4th week of lactation (p = .015). It is concluded that a larger cervix and/or uterus during the postpartum was associated negatively with fertility and cyclicity in Jersey cows. 相似文献
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AIM: To determine if the reproductive performance of dairy cows not previously detected in oestrus but with a detectable corpus luteum before the planned start of mating (PSM), could be improved by treatment with progesterone, oestradiol benzoate (ODB) and prostaglandin F2alpha (PGF). METHODS: Cows in 18 herds which had not been detected in oestrus, but which had a detectable corpus luteum present at veterinary examination 7 days prior to the PSM (Day -7), were allocated to 1 of 2 groups. Treated cows (n=232) received an injection of 2 mg ODB and an intravaginal progesterone releasing device (CIDR insert) on Day -7, and an injection of PGF on the day of insert removal 7 days later (Treated group). The Control group (n=243) remained untreated. Cows were mated to detected oestrus from Day 0, and conception dates confirmed by manual palpation or transrectal ultrasonography. RESULTS: During the first 7 days of mating, 37.4% of Control cows and 65.9% of Treated cows were inseminated on detection of oestrus (p<0.001). Pregnancy rates for this period were 20.4% and 36.3%, respectively (p=0.001). Conception rates to first insemination, pregnancy rates after 21 days of mating and at the end of the mating period were similar between groups (p>0.1). Median interval from the PSM to conception did not differ between treatment groups (24 and 23 days for Control and Treated, respectively, p>0.1). CONCLUSION: Treating postpartum dairy cows which had not previously been detected in oestrus but which had a detectable corpus luteum, with progesterone, ODB and PGF did not significantly improve their reproductive performance compared with no hormonal intervention. KEY WORDS: dairy cattle, postpartum, anoestrous, reproduction, progesterone treatment. 相似文献
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Johne's disease (‘paratuberculosis') is a chronic, infectious, wasting disease that affects dairy cattle. Estimation of its impact on herd productivity and corresponding economic loss on US dairy operations was part of the USDA National Animal Health Monitoring System's (NAHMS) 1996 national dairy study. Johne's-positive herds experience an economic loss of almost US$ 100 per cow when compared to Johne's-negative herds due to reduced milk production and increased cow-replacement costs. For Johne's-positive herds that reported at least 10% of their cull cows as having clinical signs consistent with Johne's disease, economic losses were over US$ 200 per cow. These high-prevalence herds experienced reduced milk production of over 700 kg per cow, culled more cows but had lower cull-cow revenues, and had greater cow mortality than Johne's-negative herds. Averaged across all herds, Johne's disease costs the US dairy industry, in reduced productivity, US$ 22 to US$ 27 per cow or US$ 200 to US$ 250 million annually. 相似文献
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为分析不同水平复合益生菌制剂添加对奶牛生产性能、乳品质及体细胞数量的影响,试验选择胎次、产奶量、泌乳天数相近的荷斯坦奶牛160头随机分成4个组,每个组4个重复,每个重复10头,1组饲喂基础日粮为对照组,试验2、3、4组每头奶牛分别在基础日粮中添加20、40、60 g/d复合益生菌制剂,预试验7 d,试验期为60 d。结果表明:(1)试验后的30、60 d,试验3、4组的平均产奶量较1相比分别提高16.0%、14.9%、25.6%、24.1%(P<0.05);(2)试验2、3、4组的4%乳脂校正、乳蛋白率、总固形物均高于1组(P>0.05);试验2、3、4组的尿素氮均低于1组(P>0.05);试验3、4组的乳糖率、乳脂率较1组分别提高14.6%、13.4%、5.0%、4.2%(P<0.05);(3)试验后的60 d,试验3、4组乳中体细胞数量较1组相比降低9.3%、7.1%(P<0.05)。综上,每头牛每天添加40 g复合益生菌制剂可以提高奶牛的生产性能、乳品质,减少体细胞数量。 相似文献
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Marcos G. Colazo Reuben J. Mapletoft 《The Canadian veterinary journal. La revue veterinaire canadienne》2014,55(8):772-780
This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy cattle and it is difficult in beef cattle. Protocols that synchronize follicle growth, corpus luteum regression and ovulation, allowing for TAI, result in improved reproductive performance, because all animals are inseminated whether they show estrus or not. As result, TAI programs have become an integral part of reproductive management in many dairy herds and offer beef producers the opportunity to incorporate AI into their herds. Gonadotropin-releasing hormone-based protocols are commonly used in North America for estrus synchronization as part of a TAI program. Protocols that increase pregnancy rates in lactating dairy cows and suckling beef cows have been developed. Protocols that improve pregnancy rates in heifers, acyclic beef cows, and resynchronized lactating dairy cows are also discussed. 相似文献