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试验建立了有效的奶牛卵巢疾病治疗技术,探讨了影响奶牛场奶牛繁殖率的若干因素。试验结果表明:PG子宫内给药组, 0. 3mg剂量同 0. 2, 0. 4mg剂量相比,发情有效头数差异虽不显著(P>0.05),但效果好于 0. 2, 0. 4mg剂量;PG肌肉注射组,一次肌肉注射 0. 6mg剂量可有效地诱导卵巢持久黄体、黄体囊肿的奶牛发情,同肌肉注射 0. 4mg剂量相比,发情效果明显地好于 0. 4mg组,且差异显著(P<0.05),同二次肌肉注射氯前列烯醇发情有效头数差异不显著。对卵巢静止和卵巢机能不全所致的乏情母牛,PMSG只注射一次即能得到预期效果。 相似文献
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用氯前列烯醇对红安格斯肉牛进行同期发情处理。一次肌注后同期发情率为75％,一次子宫注入后同期发情为85．7％,二次肌注间隔11d同期发情率为84．6％,二次肌注间隔1lh时同期发情率为96．4％。处理后同期发情时间分别为：24h占5．5％,24～36h占29．1％,36～48h占38．2％,48～60h占6．0％。结果表明：氯前列烯醇对红安格斯肉牛进行同期发情处理,二次注射法优于一次注射法,子宫给药优于肌肉注射给药。处理后发情集中在24～48h,情期受胎率达54．0％。 相似文献
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为控制母牛适宜的产犊间隔(12～13个月),我们采用氯前列烯醇对乏情奶牛进行促情效果的实验。1材料和方法选择年龄4～8岁,中等膘情,产后120d以上不发情,直检未孕,卵巢上有黄体的黑白花奶牛为试验牛168例,按随机选择的方法进行分组实验:A组为子宫内投用氯前列烯醇药物;B组为肌肉注射氯前列烯醇药物。氯前列烯醇(0.2mg/支),上海市计划生育科学研究所研制,批号970318。2结果见表1,子宫内灌注氯前列烯醇0.2mg、0.3mg、0.4mg,发情有效头数差异不显著(p>0.05);肌肉注射氯前列烯醇0.2mg、0.4mg,发情有效头数差异显著(p<0.05);子宫内灌注给药0.2mg、… 相似文献
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于黄牛发情季节应用国产氯前列烯醇 2次处理黄牛具有明显的同期发情效果 ,96小时内母牛同期发情率可达 80 %～ 92 .5% ,母牛于第 2次药物处理发情后发情率、卵泡发育率无明显差异 ,3mg氯前列烯醇剂量的人工配种情期受胎率与自然发情情期配种受胎率相比差异显著 相似文献
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选择2～4岁繁殖性能正常、体况中等的经产皖北黑猪44头,根据年龄和胎次均衡原则按2×2试验设计方案分组,分别比较4和8月份在断奶当天肌肉注射氯前列烯醇诱导发情效果。结果表明:在春季,进行氯前列烯醇处理断奶母猪效果不明显;在夏季,氯前列烯醇促使猪在断奶一周内发情配种率达87.5%,高于对照组14.2%(P>0.05),但均低于春季,且两个季节的对照组之间差异极显著(P<0.01)。母猪自断奶至发情间隔时间,氯前列烯醇处理在夏季为(6.1±0.3)d,显著低于对照组(P<0.05),但与春季相比无显著差异(P>0.05)。母猪在夏季的发情持续时间趋向延长(P>0.05)。季节内氯前列烯醇处理猪的分娩率高于对照组(P>0.05),窝产仔数无显著差异(P>0.05)。提示氯前列烯醇具有调节断奶母猪繁殖性能的低下作用,在夏季促使其发情,缩短断奶至发情间隔时间。 相似文献
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为了增加养羊业的经济效益,以及医学、药学进行山羊动物试验的需要,必须提高山羊的繁殖效率,增加山羊怀孕的多胎率。为此作者特设计采用氯前列烯醇(Cloprostenol)对华东地区的山羊(江苏海门山羊)进行同步处理并配种以达到提高山羊的多胎率,提高山羊利用效率的目的。试验分成两组,氯前列烯醇诱导组(T)136头和非诱导组(UT)136头。结果显示,采用氯前列烯醇诱导的山羊(T)多胎率达到78.7%(107/136),怀孕羔羊数平均达到了2.01只/胎(273/136),而未采用氯前列烯醇诱导的对照组山羊(UT)的多胎率只有39.0%(53/136),怀孕胎数平均为1.31只/胎(179/136),两组之间差异极显著(P<0.01),氯前列烯醇处理组羔羊出生后生长、发育正常。本试验结果表明,通过氯前列烯醇诱导可以明显提高山羊的怀孕多胎率,对山羊优良品种的繁育、种群的快速扩繁及试验用山羊的研制等具有重要的经济价值和应用价值。 相似文献
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2004年3月份对18只波尔山羊用炔诺酮阴道栓-FSH-氯前列烯醇法进行超数排卵处理,超排后发情18只(100%),平均采胚数16.22±8.42枚,平均可用胚数15.00±8.25枚.对212只甘肃天水本地山羊用炔诺酮阴道栓-FSH-氯前列烯醇法进行同期发情处理,同期发情率98.58%(209/212).对159只受体进行手术,可移植受体比例为91.82%(146/159).移植受体妊娠率为63.7%(93/146),其中妊娠中后期流产7只,妊娠到期86只,共产羔117只. 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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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
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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