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为了提高奶水牛人工授精的受胎率,准确把握发情症状和适时的输精是技术的关键。本文就奶水牛发情表现、发情观察、适时输精技术要点及应注意的关键性技术措施等作了分析,为奶水牛产业化发展、提高人工授精受胎率提供参考及指导。 相似文献
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主要从水牛的生理特点分析了水牛人工授精受胎率低的原因,并提出了相应的措施。认为造成水牛人工授精受胎率低的原因主要有:水牛发情的持续时间比较长,发情外部表现、卵泡发育不明显,以及适时配种的判断不正确和人工授精输精部位不正确等因素。提出解决的措施主要有:正确判断母牛的发情、排卵和适时的配种时间,选择最佳的输精部位和增加输精次数(情期内进行2-3次输精)等,可有效地提高水牛的配种受胎率。 相似文献
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《养殖与饲料.饲料世界》2017,(6)
为提高盈江县牛人工授精受胎率,2013-2015年(每年的7~10月)对德宏本地黄牛30头、德宏水牛30头、杂交奶水牛30头进行同期发情处理。结果表明:发情率、受胎率分别为96.7%、73.3%(本地黄牛);93.3%、53.3%(德宏水牛);90%、50%(德宏杂交奶水牛),同期发情处理效果明显。 相似文献
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在牛品种改良工作中,人工授精受胎率是一项关键性技术环节。对于水牛来说,因体况差异,季节气候的不同,发情表现差异较大,同时由于农村中牛的分布较散,难于集中配种,判定适时配种的难度较大,受胎率出现偏低的现象。笔者从2001年以来,主要从事水牛的人工受精配种工作,冻配水牛136 相似文献
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本文针对母水牛(以下称水牛或母牛)的发情特点、适时输精进行探讨。结果:①水牛发情时性欲较冷淡,从1天至几天不等,特征性表现(如黏液、外阴部的变化等)不十分明显,发情阶段的划分仅相对而言,必须结合通过直肠检查卵巢的变化,综合判断水牛的适时输精时间。②大部分水牛在发情后平均40h左右即进入发情的后期或末期,是比较理想的输精时间。母牛在发情后36~40h进行人工授精,配种受胎率达56.00%(输精2次),在发情后24h以前或发情后60h以后的配种受胎率比较低,相比分别相差41和40个百分点,差异极显著(P<0.01)。 相似文献
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与黄牛比较,水牛发情不明显、且持续时间长、卵泡发育不明显以及卵巢静止发育等原因造成了水牛的配种受胎率低。据资料报道,水牛本交的受胎率在60%左右,而冻配受胎率仅在45%左右,可见要提高其配种受胎率,必须对水牛发情的特点进行深入的研究,才能在临床上比较准确地判断适时输精,提高水牛的冻配受胎率。本文就水牛发情各个时期的特点进行观察和研究,探索水牛的适时输精时间,旨在提高水牛的配种受胎率。 相似文献
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笔者从2003年起就一直探讨如何提高水牛人工授精受胎率.由于黄牛的人工授精受胎率达85%~90%,远比水牛的35%~66%高.为使国家奶水牛补贴项目更好地实施,提高水牛人工授精受胎率显得尤为重要而迫切.笔者采取综合措施,冻配517头经产母水牛和73头青年"处女"母水牛的人工配种的工作实践,受胎率为75.6%和65.8%.现介绍如何提高水牛人工授精受胎率技术措施. 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
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临沂市具有较好的农业资源,适合发展奶山羊养殖业。但是,目前奶山羊传统的自然交配繁育速率较慢,且受胎率低,不利于奶山羊养殖业的快速发展。近年来,由于人工授精技术具有增强繁殖速率、提升受胎率、提高种公羊利用率和降低成本等优点,在畜牧养殖业中的运用和推广十分广泛。但是人工授精的成功率受到母羊发情期、精液采集和保存、输精方式等多种因素的影响,因此增强对该技术的了解,对促进当地奶山羊的良种繁育具有重要意义。 相似文献
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[目的]为了解意大利地中海水牛冻精的授精效果及其在我国生长适应情况。[方法]利用国内首次引进意大利地中海水牛冻精与我国现有的摩拉、尼里——拉菲和本地水牛进行人工授精,试验选取自然发情的摩拉水牛20头,尼里水牛16头,本地水牛32头,年龄在2.5~9岁之间,采用直肠把握子宫角深部输精法,配种后40 d应用B超进行早期妊娠诊断怀孕情况。[结果]:摩拉、尼里——拉菲和本地水牛受胎率分别为50.00%、75.00%、56.25%,平均人工授精配种受胎率为58.82%,品种间人工授精受胎率差异不显著(P〉0.1)。[结论]表明引进地中海水牛冻精开展杂交组合,改良我国现有的水牛品种,提高其生产性能是切实可行的。 相似文献
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A program involving greater veterinary participation in detection of estrus and artificial insemination of cattle was evaluated in a 700-cow dairy herd from January 1987 through August 1988. Previous reproductive performance was below normal. First-service pregnancy rate from artificial insemination was 42%, and mean number of nonpregnant days for the cows was 120. Between postpartum days 55 and 62, all cows with functional corpus luteum assessed by rectal palpation were administered prostaglandin each Monday morning. Return visits were made to the herd each Thursday and Friday to observe cows and to inseminate those in estrus. On the other 5 days of the week, the owner or his employees inseminated all cows in estrus. The first-service pregnancy rate for 842 cows observed in estrus and inseminated by the veterinarian was 59%. The pregnancy rate for cows inseminated by the owner and his employees increased from 42% to 50%. The mean number of nonpregnant days for all 700 cows decreased from 120 to 98 days, resulting in approximately $46,000 of increased income for the dairyman or approximately a 4 to 1 return on investment in veterinary service. Results indicate that veterinarians could improve herd reproductive performance and solve chronic herd breeding problems by more actively participating with their clients in estrus detection and artificial insemination programs in cattle. The program allows practicing veterinarians an opportunity to observe cows for estrous behavior, establish their own pregnancy rate data, demonstrate to owners the importance of observing primary signs of estrus, and teach expert artificial insemination techniques. 相似文献
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采用不同药物处理和给药方式,对不同品种水牛在不同季节自然发情和同期发情配种后的受胎效果进行系统研究,以期建立一套稳定的适合水牛同期发情的处理方法。试验选取本地水牛(102头)、摩拉水牛(129头)、尼里/拉菲水牛(98头)和杂交水牛(326头)共655头,分为5个组进行比较试验。结果表明:河流型摩拉水牛和尼里/拉菲水牛的同期发情率和配种受胎率均高于杂交水牛和本地水牛(P<0.05),但同为河流型的摩拉和尼里/拉菲水牛之间没有差异(P>0.05),以本地水牛效果最差,其同期发情率和配种受胎率分别为74.51%和30.39%;应用不同的药物处理时,以GnRH+PGF2α+GnRH效果最好,同期发情率和受胎率分别为88.46%和46.38%,其同期发情率显著高于其他各药物组(P<0.05),而用PGc的效果最差(分别为79.10%和33.21%);用PMSG肌注+PGc灌注法,其同期发情率和受胎率效果最好,显著高于其他各组(P<0.05),其次是PMSG肌注+PGc肌注法,PGc肌注法效果最差;在冬季进行同期发情处理时,同期发情率和受胎率最高(分别为83.75%和43.28%),明显高于其他各季节(P<0.05);水牛自然发情的人工授精受胎率和胚胎移植的受胎率均比同期发情的高,差异显著(P<0.05)。 相似文献
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孙根泽 《畜牧兽医科学(电子版)》2021,(5):157-158
奶牛人工授精是以人工方法,采用机械手段采集优质种公牛的精液,再经过机械手段将特定处理后的精液输入母牛生殖道的一种生产技术方式。人工授精操作能极大减少种公牛的养殖数量,节约养殖成本,提高优质种公牛的利用效率,加快品种改良进程,促进育种工作的开展。但由于奶牛人工受精是一个侵入性的操作,一旦操作不合理或者各个细节把握不完善,会造成繁殖母牛出现严重的繁殖障碍,降低母牛的受胎率,不利于提高品种改良和扩大养殖效益。该文主要论述奶牛人工受精受胎率的影响因素,提出相应的改进措施。 相似文献
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SMH Andrabi 《Reproduction in domestic animals》2009,44(3):552-569
Storage of buffalo ( Bubalus bubalis ) bull semen in the cryopreserved state is discussed in this article. Fertility rate in buffalo following artificial insemination with frozen–thawed semen is reviewed. To better understand the freezability of bubaline spermatozoa, the available data on biochemical components and the activity of specific enzymes of semen/spermatozoa are given. Moreover, the major factors that may influence the post-thaw viability and fertility of buffalo spermatozoa are examined in detail. In addition, suggestions for improvement in cryogenic procedures for buffalo spermatozoa are also given. 相似文献