共查询到20条相似文献，搜索用时 62 毫秒
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为了提高绵羊繁殖效率,研究绵羊同期发情和两年三羔生产技术,试验一采用两次肌肉注射PG法和CIDR+PMSG法分别对蒙古羊和小尾寒羊在繁殖季节和非繁殖季节进行了同期发情处理。结果表明：在繁殖季节,两次PG法对蒙古羊的发情率为85.71%,对小尾寒羊的发情率为93.75%,两者之间差异不显著（P>0.05）;CIDR+PMSG法对蒙古羊的发情率以PMSG剂量200 IU最佳,发情率为92.00%;对小尾寒羊的发情率以PMSG剂量250 IU最佳,发情率为93.75%。在非繁殖季节,两次PG法对蒙古羊的发情率为57.14%,对小尾寒羊的发情率为65.63%,两者之间差异不显著（P>0.05）;CIDR+PMSG法对蒙古羊的发情率以PMSG剂量250 IU最佳,发情率为89.29%,对小尾寒羊的发情率以PMSG剂量300 IU最佳,发情率为93.33%,两者之间差异不显著（P>0.05）,但均极显著高于两次PG法（P<0.01）。试验二应用同期发情技术和羔羊早期断奶技术分别对蒙古羊和小尾寒羊进行处理。结果表明：实施两年三羔繁殖技术,蒙古羊和小尾寒羊的受胎率分别为88.4... 相似文献
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将99只辽宁绒山羊分2批、4组,于春、秋两季进行同期发情试验。在秋季采用A组CIDR+PMSG+PG(埋栓14 d)和B组CIDR+PG(埋栓14 d),春季采用C组CIDR+PMSG+PG(埋栓19 d)和D组CIDR+PMSG(埋栓19 d)。结果表明:①秋季撤栓前加注250 u PMSG,同期发情率极明显高于单注PG组(P<0.01),且发情集中在撤栓后的0～24 h。②春季撤栓时加注PG,可显著提高发情率(P<0.01)。③用同一组激素处理,秋季与春季的同期发情率差异显著(P<0.05)。两季节假发情率春季高于秋季,差异极显著(P<0.01)。 相似文献
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《畜牧兽医杂志》2018,(6)
对湖羊和小尾寒做同期发情处理,研究其同期性和胚胎移植效果。选择湖羊和小尾寒羊各60只,采用"CIDR+PG+PMSG"和"CIDR+PG"2种同期发情方案,观察其发情效果、黄体质量,并对同期发情效果好的受体羊进行鲜胚移植。同期发情处理后湖羊组和小尾寒羊组的发情率分别为88.33%(52/60)和85%(50/60),两者差异不显著(P0.05),同期发情方案I和方案II的发情率分别是90%(54/60)和80%(48/60),两者差异显著(P0.05)。选择发情最集中在25~48h,黄体合格的受体羊进行胚胎移植,湖羊组和小尾寒羊组受胎率分别为67.57%(25/37)和65.63%(21/32),两者差异不显著(P0.05)。[结论]甘肃陇东地区舍饲湖羊和小尾寒羊均可作为引进肉羊的胚胎移植受体羊,为陇东肉羊胚胎移植提供科学依据。 相似文献
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《畜牧与兽医》2015,(7):47-49
为了进一步提高多浪羊高频繁育效率,探索新疆批次养羊模式,研究了CIDR+PG+PMSG、CIDR+PMSG和CIDR+PMSG+A33种不同的处理方法对秋季空怀多浪羊同期发情效果及人工受精后受胎率及产羔率的影响。结果:CIDR+PG+PMSG处理后的母羊发情率、受胎率及产羔率分别为93.1%,96.3%和125.0%,显著高于CIDR+PMSG处理组的发情率(80.4%)、受胎率(80.0%)及产羔率(94.4%),也显著高于CIDR+PMSG+A3处理组的发情率(78%)、受胎率(79.5%)及产羔率(93.5%)(P0.05)。CIDR+PMSG和CIDR+PMSG+A3处理组之间的发情率、受胎率及产羔率差异不显著。表明在秋季使用CIDR+PG+PMSG法对多浪羊进行高频繁育可以获得比较好的产羔效果。 相似文献
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不同同期发情方法对水牛发情和受胎效果的影响 总被引：12，自引：1，他引：12
本试验在1999—2003年对1132头母水牛进行同期发情,分10个处理组进行了比较。96 h内的总发情率为75.55%,3个月孕检第1情期受胎率为45.70%。其中宫内输入PGc0.6mg+肌注PMSG1000 IU+4℃保存精液组、CIDR+肌注PGc0.6mg+肌注PMSG1000IU组和宫内输入PG c0.66mg+肌注PMSG1000IU+冻精组取得较高的发情率和第1情期受胎率分别为54.55%4、6.03%和46.48%;而单独肌注PG c0.6mg组、宫内输入肌注PGc4mg+肌注PMSG1000IU的发情率较低(64.18%和65.91%);试验还发现,第1次输精时给予HCG3000IU的受胎率均低于HCG1000IU的其他各组。试验表明:用同一处理方法,处女水牛对同期发情处理后反应比经产水牛差。 相似文献
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《畜牧与兽医》2016,(5):44-49
为了优化绵羊同期发情技术,本试验分析了不同外源激素对小尾寒羊的同期发情效果,并进行生殖激素测定。将80只健康、空怀的经产小尾寒羊随机分为2组,每组4个重复,每个重复10只。采用单因素设计,分别用CIDR+PMSG、PG+PMSG进行同期发情处理,并在处理期间每组随机抽取4只小尾寒羊空腹颈静脉采血,采用放射免疫法测定血清中雌二醇(E2)、孕酮(P4)、促黄体素(LH)、促卵泡素(FSH)的浓度。结果表明:CIDR+PMSG组小尾寒羊同期发情率、受胎率分别为82.50%、75.00%,均显著高于PG+PMSG处理组(P0.05);CIDR+PMSG组小尾寒羊颈静脉血液中E2浓度在撤栓24 h上升至峰值(8.64±0.13)pg/m L,显著高于撤栓时、撤栓48 h的浓度(P0.05),P4浓度在撤栓7d显著高于撤栓24 h、撤栓48 h(P0.05),LH、FSH浓度变化曲线与E2相似,都是在撤栓24 h显著升高;PG+PMSG组除LH在二次注射后的第2天、第3天显著升高(P0.05),其余3种激素浓度差异不显著(P0.05)。总之,与PG+PMSG相比,CIDR+PMSG可以显著提高小尾寒羊同期发情效率,并且发情高峰期在撤栓后的24 h前后,因此,人工输精选择在撤栓后12h~36h之间进行为佳。 相似文献
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《动物医学进展》2016,(3)
为了比较不同生殖激素组合对小尾寒羊同期发情效果的影响,采用国产孕酮阴道海绵栓+PMSG+PG(Ⅰ组)、CIDR+PMSG+PG(Ⅱ组)和2次氯前列醇法(Ⅲ组)对478只小尾寒羊进行同期发情研究。结果表明,Ⅰ组和Ⅱ组母羊同期发情率分别为81.1%和83.5%,人工授精后受胎率分别为75.3%和83.2%,差异不显著(P0.05)。Ⅲ组同期发情率94.9%,与Ⅰ组和Ⅱ组比较,差异显著(P0.05);人工授精后受胎率80.6%,与其他两组无显著差异(P0.05)。3种处理方法导致母羊阴道炎发病率分别为8.2%、3.0%和0。综合考虑3种处理方法的同期发情效果、受胎率和药品成本,国产孕酮阴道海绵栓可替代CIDR在生产中大范围使用。 相似文献
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为了提高努比亚山羊繁殖力,研究同期发情技术在努比亚山羊上的处理效果,试验分别采用CIDR+PMSG+PG、CIDR+FSH+PG、孕酮海绵栓(自制)+PMSG+PG 3种方法对努比亚山羊进行同期发情处理。结果显示:CIDR+PMSG+PG、CIDR+FSH+PG方法同期发情率相同,略高于孕酮海绵栓(自制)+PMSG+PG方法,但差异不显著(P≥0.05);CIDR+FSH+PG方法受胎率最好,孕酮海绵栓(自制)+PMSG+PG次之,CIDR+PMSG+PG效果第三,但差异不显著(P≥0.05)。 相似文献
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为了比较CIDR＋PG与CIDR＋PG＋PMSG两种激素处理方法对于受体同期发情以及胚胎移植的效果,将103只小尾寒羊作为胚胎移植受体分为两组,分别使用上述两种方法进行同期发情处理。其中,CIDR＋PG组83只,CIDR＋PG＋PMSG组20只。在对供体羊人工输精后第6．5天获取移植囊胚,分别移植到两组受体子宫内。统计受体的发情率、黄体生成情况,以及移植后的妊娠情况。CIDR＋PG组与CIDR＋PG＋PMSG组受体羊发情率分别为87．95％、90．00％;有黄体羊的比例分别为37．35％和75．00％,平均黄体数为1．81和1．93个;两组受体胚胎移植后妊娠率分别为77．41％和86．67％。结果表明,使用CIDR＋PG＋PMSG进行同期发情效果较好,且胚胎移植后妊娠效果较好。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献