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《黑龙江畜牧兽医》2020,(6)
为了研究新兽药维生素ADE注射液对奶牛受胎率的影响,试验选取190头60 d以上不发情或未受孕荷斯坦奶牛,分别在4个牧场按同一试验方案开展试验,每个牧场分为对照组、试验1~4组,其中对照组不予给药,试验1~4组分别给予促性腺激素释放激素+氯前列醇钠(GnRH+PG-Cl)、GnRH+PG-Cl+维生素ADE注射液、维生素ADE注射液、维生素AD+维生素E注射液,以观察维生素ADE注射液对奶牛受胎率的影响。结果表明:试验奶牛配种后45 d经直肠检查发现,与对照组相比,4个牧场各试验组奶牛的发情率和受胎率均明显升高,其中试验1组、试验2组受试奶牛的发情率和受胎率均呈现出极显著提高(P0.01);试验3组和试验4组受试奶牛发情率表现为显著提高(P0.05),受胎率为极显著提高(P0.01)。说明维生素ADE注射液与激素类药物联合应用(或单独交替使用)可以有效提高奶牛的发情率和受胎率。 相似文献
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目的 为探讨同期发情技术在规模化奶牛场中的应用方案。方法 分别采用3 种不同处理方法对产后80 天奶牛进行同期发情处理,试验结束后比较不同处理方法对奶牛发情率和受胎率的影响。结果 试验A组、B组和C组的发情率分别为72.50%、80.00%和87.50%;受胎率分别为62.07%、65.63%和68.57%,其中试验C组的发情率显著高于另外两组(P<0.05)。结论 同情发情技术的推广可以大大提升奶牛养殖业的经济效益,且在本试验条件下,试验C组的同期发情效果最优。 相似文献
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《中国奶牛》2017,(7)
为了研究计步器监测系统对奶牛场繁育指标(受胎率、发情揭发率)的影响,及奶牛活动量同牛只健康状态的关系,本试验筛选出未孕健康牛只随机分成两组,分别利用计步器监测系统及人工观察方法对奶牛进行发情鉴定及配种工作,然后统计这两种方式对奶牛受胎率和和发情揭发率的影响。结果显示,与人工观察相比,使用计步器观察奶牛发情后,两名配种人员所配牛的受胎率均有所提高(32.71%VS 35.65%,34.94%VS 38.91%);且使用计步器的发情揭发率远远高于人工观察方法(99.15%VS 71.59%);计步器所记录的活动量同奶牛的健康状态密切相关。结果表明,计步器的使用可在帮助规模化牧场提高繁育指标的同时,也帮助技术人员及时找出病牛并进行针对性治疗。 相似文献
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试验选择荷斯坦母牛17头,分为两组,采用"阴道栓+氯前列醇钠+促排卵素3号"模式(试验Ⅰ组)和"阴道栓+氯前列醇钠"模式(试验Ⅱ组)分别对奶牛进行同期发情处理,观察奶牛发情效果。结果表明,试验Ⅰ组情期发情率100%,试验Ⅱ组情期发情率为77.7%,两组情期发情率差异显著(P0.05)。试验Ⅰ组受胎率87.5%,试验Ⅱ组受胎率66.6%,两组受胎率差异不显著(P0.05)。说明采用"阴道栓+氯前列醇钠+促排卵素3号"模式较"阴道栓+氯前列醇钠"模式在奶牛情期发情和受胎上有显著效果,值得在实践中推广应用。 相似文献
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[目的]为提高奶牛受胎率本试验针对人胎盘组织液提高受胎率,[方法]同时做了两批同期发情,分别为A组和B组,A组没有使用人胎盘组织液,B组使用了胎盘组织液,奶牛发情后,进行人工授精,40天后用B超进行孕检,从试验结果看到注射胎盘组织液的A组受胎率明显高于没有注射的B组。[结论]证明人胎盘组织液对提高奶牛发情具有良好作用。 相似文献
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北京地区季节变化对奶牛发情和受胎的影响 总被引:1,自引:0,他引:1
为探讨北京地区季节变化对奶牛发情和受胎的影响,采集了2007年1月—2009年11月,北京三元绿荷奶牛中心西郊一场温度记录和6413牛次的发情及受胎数据进行统计分析。结果表明,春季奶牛发情率和情期受胎率分别为47.36%和38.75%,夏季分别为38.57%和26.00%,秋季分别为52.26%和38.23%,冬季分别为49.17%和43.23%。奶牛夏季的发情率和情期受胎率显著低于其他季节(P<0.05)。结果显示,北京地区季节变化对奶牛的发情和受胎有明显影响。 相似文献
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激素剂量对奶牛同期发情效果的影响 总被引:1,自引:0,他引:1
为了提高奶牛繁殖性能,研究了不同剂量PGF_(2α)和GnRH对奶牛产后子宫复旧以及受胎率的影响。试验分别选择体况评分为2.5~4.0和大于4.0的荷斯坦奶牛各15头,作为试验Ⅰ组和试验Ⅱ组,将两组试验牛分别随机分为3个处理组(A、B、C;n=5),进行3种不同剂量PGF和GnRH的同期发情定时输精程序处理,并进行子宫黏液评分和直肠检测评分,分析奶牛的同期发情率和受胎率。结果表明:对于体况评分在2.5~4.0之间的适中奶牛,PGF_(2α)和GnRH的剂量分别为0.6 mg和60μg时,通过同期发情定时输精程序使得奶牛的发情时间最为集中,同期发情效果最理想,受胎率最高;对于体况评分高于4.0的较肥奶牛,PGF_(2α)和GnRH的剂量分别为0.8 mg和80μg时,同期发情定时输精效果较优。 相似文献
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试验旨在探明皮下注射褪黑素(MT)对荷斯坦奶牛配种妊娠率及血清生殖激素的影响。用计步器法确定自然发情的首次配种荷斯坦奶牛150头,对其中70头进行颈部皮下肌内注射褪黑素30 mg,12 h后进行人工输精;选择170头产后首次配种的荷斯坦奶牛进行同期排卵-定时输精处理,其中90头荷斯坦奶牛最后一次注射促性腺激素释放激素(gonadotropin-releasing hormone,GnRH)的同时进行颈部皮下肌内注射褪黑素30 mg,16 h后进行人工输精。在进行二次配种的荷斯坦奶牛中选择153只进行皮下注射褪黑素。荷斯坦奶牛输精后20~35 d进行妊娠检查,详细记录首次配种妊娠母牛头数、二次配种妊娠母牛头数、产犊数。选取同期排卵-定时输精的荷斯坦奶牛25头,皮下注射褪黑素8 h后用放射免疫法检测其血清中褪黑素、促卵泡素(FSH)、促黄体素(LH)、雌二醇(E2)的含量及35 d妊检时妊娠母牛血清中孕酮(P4)含量。结果显示,与自然发情和同期排卵对照组相比,其对应的皮下注射褪黑素组荷斯坦奶牛的妊娠率及产犊率均显著提高(P<0.05);皮下注射褪黑素组的双犊率显著提高(P<0.05),首次配种妊娠率和产犊率均显著提高(P<0.05),二次配种妊娠率和产犊率均差异不显著(P>0.05)。血清激素检测结果表明,与对照组相比,皮下注射褪黑素组血清中褪黑素、LH、E2含量均显著增加(P<0.05);35 d妊检时,皮下注射褪黑素的妊娠母牛P4含量显著增加(P<0.05)。本试验结果表明,皮下注射褪黑素能够提高荷斯坦奶牛的妊娠率、产犊率及血清中LH、E2和P4含量,说明皮下注射褪黑素能够促进卵母细胞成熟和排卵,并提高配种妊娠率。 相似文献
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Oestrus during pregnancy in the cow 总被引:1,自引:0,他引:1
Forty-three oestruses were observed in 35 pregnant cows in one beef suckler herd and 17 dairy herds; at each oestrus the pregnant cow stood willingly to be mounted by another cow or bull. Such oestruses were observed at all stages of pregnancy, although more often between 121 and 240 days, occurred more than once per pregnancy and were also seen in successive pregnancies. On one farm where the dairy cows were observed for four 30 minute periods daily, oestrus was recorded in 5.7 per cent of pregnant cows. The behavioural signs associated with oestrus during pregnancy were indistinguishable from those of true oestrus in non-pregnant animals and although its duration was shorter (mean 5.6 hours), its intensity was comparable to that of the true oestrus. Pregnant cows showing oestrus were usually seen interacting with other oestrous cows in the sexually active group. Pregnant cows showing oestrus had a higher mean condition score (3.9 +/- 0.64) than control pregnant cows (3.0 +/- 0.36). Physiological changes in the genital tract normally associated with true oestrus were not observed in pregnant cows showing oestrus. There was no ovulation or metoestrous bleeding. The characteristics of cervical mucus, including ferning patterns, were similar to those of pregnant cows at the same stage of pregnancy. Hormonal changes associated with oestrus in non-pregnant cows were not observed in the pregnant cows exhibiting oestrus. Seven of nine pregnant cows at oestrus stood willingly to be mounted by a bull. On seven occasions, bulls exposed only to cervical mucus from pregnant cows showing oestrus did not display flehmen.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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R L Butcher J E Reber A W Lishman K F Breuel F N Schrick J C Spitzer E K Inskeep 《Journal of animal science》1992,70(12):3831-3837
The first two experiments examined the role of the uterus in low pregnancy rates of beef cows induced to ovulate by early weaning. At 20 to 25 d postpartum, one-half of the cows in Exp. 1 and 2 received a s.c. implant containing 6 mg of norgestomet (NOR) for 9 d (NOR-pretreated) and the remaining cows were untreated controls (CON). Lengths of first postpartum luteal phase after weaning of calves at d 7 after implant insertion were expected to be normal in NOR-pretreated and short in CON cows. In Exp. 1, cows of both groups received an implant containing 3 mg of NOR at d 4 after first estrus and a silastic implant with 15 or 25 mg of NOR at d 7 after first estrus. At 7 d after first estrus, two embryos were transferred into the uterus of each cow and pregnancy was diagnosed by ultrasonography at d 35. Blood samples were collected daily from onset of treatment to d 8 after estrus and then every other day to d 24. Only 4 of 22 cows were pregnant at d 35, concentrations of estradiol (E2) were elevated after luteolysis, and large follicles were present at d 35. In Exp. 2, all cows were injected with 100 mg of progesterone (P4) twice daily from d 4 to 35 after first estrus. Embryos were transferred, pregnancy was diagnosed, and blood samples were collected as in Exp. 1, except blood sampling was continued to d 34.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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本试验旨在通过对适龄母牛"短期优饲"技术应用,缩短母牛产间距,提高肉牛养殖经济效益。在哈密市伊州区天山乡吐克塔尔养殖专业合作社以圈舍养殖"集中短期优饲"(试验组1)与伊吾县前山乡以"草原放牧+补饲"(试验组2),采用不同的处理方法对适龄母牛进行人工授精改良。结果显示:试验组1筛选60头母牛,发情授精49头,发情率81.6%;试验组2筛选母牛446头,发情受配246头,发情率55.2%,两组相比较差异极其显著(P0.01)。通过B超妊娠检查,试验组1受配牛48头,妊娠42头,试验组2受配母牛抽检209头,妊娠183头;两者受胎率均为87.5%,两组间差异不显著(P0.05)。结论:舍饲"短期优饲"组,母牛发情集中,发情率高,且便于观察和适时授精。 相似文献
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[目的]研究和牛母牛超数排卵及胚胎移植效果。[方法]利用纯种和牛母牛作为供体,荷斯坦母牛及西杂母牛作为受体,通过供体牛的超数排卵、人工授精、采胚、胚胎冷冻及受体牛的同期发情和鲜胚移植,快速获得纯种和牛及和牛胚胎。[结果]对4头青年纯种和牛母牛进行超排,重复冲卵13头次,共采卵数122枚,其中75枚可用胚胎,可用胚率为61.5%,平均5.76枚/头次。对75头荷斯坦牛及西杂母牛同期发情,结果获得89.2%的同期发情率。67头受体牛移植了鲜胚,2个月后妊娠检查有35头怀孕,移植妊娠率为52.23%。[结论]可以利用超数排卵及胚胎移植增加和牛母牛利用效率。 相似文献