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放牧条件下受体牛同期发情技术研究 总被引：5，自引：1，他引：4
本研究在内蒙古乌拉盖地区 ,对草原放牧型蒙古杂种牛进行了不同方法处理同期发情试验 ,其结果显示 :CIDR +PG组的同期发情率 ,显著高于加拿大产Estrumate和国产氯前列烯醇组 (P <0 .0 5) ;CIDR+PG组 73.3%的发情牛集中在 4 8小时之内 ,1 0 0 %的发情牛集中在 4 8～ 96小时之间 ,而其它两种方法处理 ,PG注射后第 4～ 5天仍有 5.9%和 7.5%的母牛发情 ;进口和国产PG同期发情率无显著差异(P >0 .0 5) ;三种处理方法的黄体合格率无显著差异 (P >0 .0 5) ,但从受体移植利用率来看 ,CIDR +PG组显著高于其它两组 (P <0 .0 5) ;育成和经产牛之间比较 ,前者同期发情率显著高于后者 (P <0 .0 5)。 相似文献
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应用“两次PG法”对秦川系胚移受体母牛进行同期发情试验，对四个试验点经直检选出277头受体母牛于移植前19～20d每头试牛注射PG0.6mg，隔11d每头再注射0．6mg，于第二次注射后的次日连续数日全天观察发情。对发情牛在第七天通过直检鉴别黄体质量。试验结果表明，同期化处理后发情226头，同期发情率81．6％，其中82．2％的母牛集中在48～96h发情。黄体合格母牛161头，合格率71．6％。其中A级黄体占64．6％，B级黄体占35．4％。对黄体合格母牛进行冷冻胚胎移植，受体移植率58．1％。 相似文献
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氯前列烯醇在促进母畜发情,排卵及提高受胎率,治疗持久黄体有较好的疗效。1用于同期发情:母牛肌注或子宫腔注射每头2～4ｍＬ,母猪每头1～2ｍＬ。该激素具有调整与控制母畜发情周期之功效,使之在预定时间内集中发情,以便合理组织生产。2治疗持久黄体:母牛每头2～4ｍＬ,可行肌注或子宫注射。该激素具有强溶解黄体的作用,能较快地促进黄体退化,加快母牛的发情,一般在注后3～5天内可发情,以子宫腔注射,效果最佳。3提高受胎率:当用颗粒精液输精时,在精液中加入氯前列烯醇05ｍＬ,可显著提高受胎率。此外,又可辅助治疗胎衣不下,肌注2～4ｍＬ,注后能… 相似文献
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试验共设六个组。一、二组分别由3头黑白花成年干乳牛和7头黑白花育成母牛组成。药物处理:每公斤体重肌注苯甲酸雌二醇0.1mg,每日一次,连注7天。停药5天后,每头再注利血平5 mg,连注4～5天。三、五组分别由6头黑白花育成空怀母牛和6头西门塔尔育成空怀母牛所组成。药物处理:每头肌注雌二醇4～8mg直至泌乳。第四组由5头西门塔尔成年空怀干奶牛组成。药物处理:每公斤体重注雌二醇0.1mg,黄体酮0.25mg,连注7天。停药5天后再注利血平5mg,连注4—5天。第六组由5头西门塔尔空怀泌乳母牛(日产乳0.5—1.0kg)组成。药物处理:肌注雌二醇5—6 mg/头·日,黄体 相似文献
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为了探索提高西门塔尔母牛繁殖率的措施，试验将新疆阿瓦提县饲养的西门塔尔适龄空怀母牛1 286头分为3组，A组462头母牛、B组430头母牛，第0天肌肉注射维生素ADE液10 mL,第7天肌肉注射氯前列醇钠(CS)0.8 mg(A组第7天同时肌肉注射维生素ADE液10 mL,B组不注射),第10天发情的母牛肌肉注射1支促黄体素释放激素A3(LH);C组394头母牛，第0天检查空怀并登记，第7天肌肉注射氯前列醇钠0.8 mg,第10天有发情表现的肌肉注射1支促黄体素释放激素A3。3个组母牛均在注射氯前列醇钠6 h内采用西门塔尔牛X性控冻精进行人工授精。空怀母牛自然返情后(19～21 d)进行补配，配种前肌肉注射1支促黄体素释放激素A3。测定母牛首次和二次发情率、受胎率和母犊率。结果表明：经过两次同期发情处理，A、B、C组西门塔尔母牛总发情率分别为98.9%、97.9%、95.2%,总受胎率分别为89.1%、81.5%、72.5%,母犊率分别为90.2%、90.4%、90.4%。说明西门塔尔母牛同期发情处理第0天和第7天肌注复合维生素ADE液可以显著提高母牛的发情率、受胎率。 相似文献
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《中国草食动物科学》2017,(1)
为了建立针对秦川牛这一地方品种稳定、高效的同期发情程序,选取秦川牛母牛20头,用4种同期发情方案对秦川牛进行108头次处理:方案Ⅰ(CIDR撤栓后直接观察发情)、方案Ⅱ(CIDR撤栓后肌注PG)、方案Ⅲ(1次PG处理)和方案Ⅳ(2次PG处理);应用"2次PG法"在夏秋季(5—10月)和冬春季(11—翌年4月)共处理秦川牛供体84头次。结果表明:秦川牛4种方案的同期发情率分别为60.0%、75.0%、53.3%和79.3%,总同期发情率77.8%,其中方案Ⅳ的同期发情率(79.3%)显著高于方案Ⅲ(53.3%)(P0.05),其余各方案间差异均不显著(P0.05);夏秋季和冬春季的同期发情率(82.5%、75.0%)差异不显著(P0.05)。 相似文献
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在同一牧场随机选取产后48－80d的哺乳母牛，肌肉注射氯前列烯醇0.6mg／头，发情天计为0d，第7d对黄体合格的牛进行胚胎移植。第11d对黄体不合格的牛及未发情的牛进行第二次肌肉注射氯前列烯醇0.6mg／头，20d以后对黄体合格的发情牛再次进行胚胎移植。结果产后48-60d的牛发情率、可移植率分别比61－70d、71－80d的牛低，（P＜0.025），可移植率差异不显著（P＞0.025）；PG第一次处理发情率、可移植率分别比第二次处理高。有黄体的牛发情率、可移植率分别比无黄体的牛高，差异不显著（P＞0.025）。 相似文献
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本文选用采卵后鉴定为子宫炎的供体母牛,用土霉素、土霉素和前列腺素(PG)、清宫液3种治疗方案对子宫炎供体牛进行了治疗.对采卵的处理情况和后续的子宫卵巢机能恢复后再配种受胎情况,冲胚时间至治疗后第1次发情时间,冲胚时间至受胎时间进行了临床效果观察.结果表明:土霉素和PG组与土霉素组、清宫液组差异显著(P＜0.05).土霉素和PG组与土霉素组、清宫液组相比,子宫炎供体牛治疗后出现首次发情和冲胚至受胎时间明显缩短,首次出现发情分别平均缩短1.56 d、3.27 d,冲胚至受胎时间分别平均缩短10.25 d、12.39 d. 相似文献
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本文采用四种同期发情方法(CIDR处理、撤CIDR栓后立即肌注PG、一次PG处理、二次PG处理)对郏县红牛进行处理,研究不同处理药物、处理方式、季节等因素对同期发情率的影响。结果表明,撤CIDR栓后立即肌注PG和二次PG处理组的同期发情效果显著优于CIDR处理或一次PG处理(P<0.05);对经产母牛的同期发情处理效果稍优于育成牛,但差异不显著(P>0.05);郏县红牛的同期发情处理效果具有季节性差异,夏秋季(5～10月份)的同期发情率显著低于冬春季(11～4月份)(P<0.05)。 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