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采用同期发情+超排对12只特克塞尔羊、无角陶赛特羊进行处理;同时采用自然发情+超排对12只德国肉用美利奴母羊进行处理。结果表明:采用同期发情+超排处理,每只特克塞尔母羊平均获卵胚8.7枚,获受精卵数7.1枚;陶赛特母羊平均获卵胚数1.8枚,获受精卵数1.8枚(P<0.01)。德国肉用美利奴供体母羊的平均获胚数13.5枚,可用胚8.7枚,可用胚率67.0%(P<0.01)。对85只受体绵羊进行同期发情处理,结果表明,处理后同期发情率达88.2%。将12枚可用胚胎移入11只受体,其中10只受体移入单胚,1只受体移入双胚,移植成功率达83.3%(P<0.01)。对62只自然发情的受体母羊进行胚胎移植,结果表明,移植2枚胚胎受体母羊的受胎率比移植1枚的要高34.0%(P<0.01)。 相似文献
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《畜牧与饲料科学》2017,(1)
通过评价双胚胎移植方法和单胚胎移植方法对蒙古绒山羊妊娠率及产羔率的影响,为优质种羊的快速扩繁提供技术支持。选取5只供体母羊进行同期发情与超数排卵处理,供体母羊发情后进行人工授精,收集胚胎;利用收集的可用胚胎对选取的39只受体母羊进行胚胎移植,其中10只受体母羊做双胚移植,29只受体母羊做单胚移植;比较双胚移植和单胚移植受体母羊的妊娠率及产羔率。结果表明:供体母羊经CIDR处理,发情率达100%,超数排卵、人工授精后共收集胚胎64枚,其中可用胚胎49枚,可用胚胎率为76.56%;双胚移植受体母羊的妊娠率为90.00%(9/10),产羔率为180.00%(18/10),单胚移植受体母羊的妊娠率为68.97%(20/29),产羔率为62.07%(18/29)。双胚移植方法比单胚移植方法可获得更高的妊娠率及产羔率,表明双胚移植方法适用性良好,具有极大的推广价值。 相似文献
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澳洲美利奴超细毛羊超数排卵与胚胎移植试验 总被引：1，自引：1，他引：0
利用从澳大利亚进口的澳洲美利奴超细毛羊69只(其中经产母羊48只,初产母羊21只)做供体,小尾寒羊320只做受体,进行胚胎移植试验,结果表明:经产母羊的发情率、采胚数、有效胚胎数和可用率(有效胚胎数/采胚数)均高于初产羊.69只处理供体羊有66只发情,收集到441枚有效利用胚胎,320只处理受体羊,有265只可用做胚胎移植,178只小尾寒羊产羔,产羔265只,受胎率和有效胚胎利用率分别为67.2%和60.1%,平均每1.7枚胚胎产1只羔羊,平均每只供体羊可获羔羊4只. 相似文献
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利用国产FSH对98只进口肉绵羊供体母羊进行超数排卵处理,通过手术方法回收胚胎1 283枚,其中可用胚874枚,平均每只供体母羊获可用胚8.9枚;利用鲜胚保存仪,对鲜胚进行保存和远距离运输移植,平均运输距离为368.8 km,平均运输时间为4.62小时,鲜胚平均保存时间为18.5小时.运用手术方法对703只受体母羊进行鲜胚异地移植,平均每只羊移鲜胚1.24枚,受胎437只,鲜胚移植受胎率62.16%.已产羔276只,产羔率按移入胚胎计算48.85%,按受胎母羊计算101.1%. 相似文献
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采用同期发情+超排对12只特克塞尔羊、无角陶赛特羊,采用自然发情+超排对12只德国肉用美利奴母羊进行处理。结果表明:采用同期发情+超排处理,平均每只特克塞尔母羊获卵达8.7枚,平均获受精卵数7.1枚;陶赛特母羊平均1.8枚,受精卵数7枚,平均获受精卵数1.8枚(P<0.01)。德国肉用美利奴羊供体母羊的平均获胚数可达13.5枚,可用胚达8.7枚,可用胚率(%)迭67.0%(P<0.01)。对85只受体绵羊进行同期发情处理结果表明,处理后同期发情率达88.2%。将12枚可用胚胎移入10只受体,其中11只受体移入单胚,1只受体移入双胚,移植成功率达63.3%(P<0.01)。对62只自然发情的受体母羊进行胚胎移植,结果表明,移植2枚胚胎,受体母羊的受胎率比移植1枚的要高34%(P<0.01)。同期发情时间差异为±0d,妊娠率达100%,而时间差异为±0.5d的为66.67%(P<0.01)。对母羊发情时间与超排效果的关系分析结果表明,撤栓后24h内,或为注射FSH后第1天,标准时间内排卵(≤±4h)的母羊占64%,延时8 h以内排卵的占27%,提早或延时1.0h~1.5h排卵的占9%。 相似文献
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杜泊绵羊超数排卵与胚胎移植试验 总被引：1，自引：0，他引：1
选纯种杜泊绵羊经产母羊(22只)为供体,通过实施同期发情、超数排卵、重复配种处理,其中20只可利用供体,每只平均采得可用胚胎5.20枚.选小尾寒羊经产母羊(90只)为受体,经同期发情处理,对有黄体发育的母羊(72只)实施胚胎移植手术.结果表明,移植单胚(40只)受体的受胎率为47.50%,移植双胚(32只)受体的受胎率为62.50%;平均受胎率为54.17%,平均每产1只羔羊所需胚胎数为2.60枚,每只供体羊冲胚1次提供的羔羊数为2只. 相似文献
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22只波尔山羊供体用CIDR FSH PG 进行超排处理, 用手术法采胚,共获138枚可用胚, 头均获可用胚为6.27 ( 138/22) 枚,其中超排育成羊6只,只均回收可用胚5.50枚,经产母羊16只,只均回收可用胚6.57枚,经产羊平均回收胚胎总数高于育成羊;手术法移植78只受体羊,妊娠53只,妊娠率68.00%,产羔71只,其中产双胎的有18只受体,占妊娠总数的34.00%. 相似文献
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青年布尔山羊超数排卵效果初探 总被引：4，自引：1，他引：3
在非繁殖季节的七月,采用阴道栓+340 mg,FSH超数排卵,处理青年母羊7只,反应采胚7只,黄体平均数15.71±7.45个,卵泡平均数3.57±3.78个,平均采胚10.71±4.89枚,平均采可用胚8.86±6.36枚,可用胚率82.7%(62/75),胚胎回收率68.2%(75/110);在繁殖季节的八月下旬、九月、十月采用三种不同FSH剂量分别超排处理青年母羊57只、6只、5只分别取得了黄体均在30枚以上,采胚均数依次为18.07±8.33枚(n=56);26±8.10枚(n=6);22.6±12.80枚(n=5);平均采有效胚依次为18.04±8.32枚(n=56),25±6.36枚(n=6),18.6±12.22枚(n=5).可用胚率低次为99.8%(1010/1012)、96.2%(150/156)、82.3%(93/1 13),小剂量的FSH超排(200mg、320mg)与大剂量的FSH超排440mg)可用胚率差异高度显著(P＜0.01). 相似文献
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绵羊胚胎冷冻保存及冻胚移植试验 《畜牧与饲料科学》1989,10(1):27-27
我们于1988年10至11月份,在本院进行了绵羊胚胎冷冻保存及冻胚移植试验。使用国产FSH和LH对5只母羊做了超数排卵处理,共排卵82枚(以黄体数计),平均每只排卵16.4±3.6枚,采用手术法收集胚胎38枚,采卵率为46.3％。其中可利用胚胎32枚,占回收胚胎数的84.2％。超排母羊头均采可用胚胎6.4枚。使用日本产计算机控制的胚胎冷冻装置冷冻胚胎22枚。解冻后存活胚胎12枚,存活率为54.5％。将10枚冻胚手术移植给5只受体母羊。现有2只受体母羊返情,情期不返回率为60％。 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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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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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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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