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不同激素剂量对幼鼠超数排卵及超排卵质量的影响 总被引：8，自引：0，他引：8
应用国产激素制剂对３～８周龄昆明种小白鼠进行了超数排卵处理,重点观察了不同激素剂量对幼龄小鼠的超排效果及超排卵质量的影响。实验结果表明,以ＰＭＳＧ与ｈＣＧ各１０ＩＵ剂量超排３～８周龄小鼠,５周龄小鼠的超排效果（平均获卵８３．８±１０．２个）极显著（Ｐ＜０．０１）好于４～８周龄小鼠的超排效果（平均获卵３９．２～４９．８个）,而３周龄小鼠超排卵受精后体外培养的卵裂率（９７．１％）、桑椹胚率（８６．８％）和囊胚率（６５．１％）与４～８周龄超排卵的（分别为８５．５％～１００．０％、９４．９％～１００．０％和６３．２％～８７．７％）相近;以ＰＭＳＧ与ｈＣＧ各５ＩＵ剂量超排３～５周龄小鼠,３周龄小鼠的超排效果（平均获卵５９．０±６．５个）显著（Ｐ＜０．０５）好于４周龄小鼠的超排效果（平均获卵３１．４±４．９个）,并极显著（Ｐ＜０．０１）好于５周龄小鼠的超排效果（平均获卵２１．４±３．３个）;以ＰＭＳＧ与ｈＣＧ各１５ＩＵ剂量超排３～５周龄小鼠,３周龄小鼠的超排效果（平均获卵４８．６±７．３个）显著（Ｐ＜０．０５）好于５周龄小鼠的超排效果（平均获卵２５．２±５．８个）,也好于４周龄小鼠的超排效果（平均获卵４０．２±５．１个 相似文献
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GnRH类似物LRH—A3配合FSH对超排母牛胚胎质量的影响 总被引：5，自引：0，他引：5
对４５头供体母牛随机用ＦＳＨ＋ＬＲＨ－Ａ３和ＦＳＨ进行超排处理。其中ＦＳＨ＋ＬＲＨ－Ａ３处理供体５２头次，ＦＳＨ处理供体２２头次；ＦＳＨ＋ＬＲＨ－Ａ３头处理组平均获得卵数，可用胚胎数分别是１０．１±８．０枚，７．４±６．９枚，与ＦＳＨ处理组（二指标分别是９．３±６．２枚，３．６±２．７）相比，分别高８．６％，１０５．６％，且二组超排获得可用胚胎数差异显著（Ｐ＜０．０５）。 相似文献
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商品肉鸡在西宁地区生理常值的测定 总被引：2，自引：0，他引：2
对明星、ＡＡ肉仔鸡在海拔２２００ｍ处的西宁地区进行生理常值的测定，结果为：１．呼吸频率高于文献记录（Ｐ＜０．０５），体温、心率与之相似；２．明星和ＡＡ鸡红细胞数、血红蛋白及ＰＣＶ分别为２．７３±０．３７和２．９３±０．４４百万／ｍｍ３，１１．３±１．３和１２．６±３．４ｇ／Ｌ，４３．６±３．９和４１．７±４．３ｍｌ％，与文献记载均有差异（Ｐ＜０．０５）；３．两品种的ＭＣＨ、ＭＣＶ分别为３８．８±１４．５和４６．１±８．１ｐｇ，１５９．２±２３．０和１７．１±１３．６Ｕ３，显著高于卢宗藩资料（Ｐ＜０．０５）。明星鸡ＭＣＨＣ低于王文三资料，ＡＡ鸡的高于其数据（Ｐ＜０．０５）；４．白细胞分类计数表明，两品利的嗜酸、嗜碱、异嗜、淋巴和单核细胞均与资料有一定变化。 相似文献
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家牦牛,半血野牦牛年产毛量的比较 总被引：1，自引：1，他引：0
对１７６头各龄家牦牛和半血野牦牛的年产毛量进行了测定。测定结果：家牦牛１岁０．９８±０．２９ｋｇ／头，２岁１．１２±０．２２ｋｇ／头，３一５岁１．１８±０．３８ｋｇ／头，６岁以上０．８８±０．２７ｋｇ／头；半血野牦牛相应为０．９０±０．２０ｋｇ／头，１．０５±０．２７ｋｇ／头，０．６８±０．２８ｋｇ／头，０．９０±０．３８ｋｇ／头；３一５岁家牦牛组的年产毛量极显著高于６岁以上年龄组（Ｐ＜０．０１），同１岁、２岁年龄组的年产毛量差异不显著（Ｐ＞０．０５），２岁与６岁以上年龄组之间呈显著性差异（Ｐ＜０．０５）；半血野牦牛各年龄组的年产毛量差异不显著（Ｐ＞０．０５）；１岁家牦牛公母间，２岁半血野牦牛公母间，年产毛量差异极显著（Ｐ＜０．０１）。 相似文献
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将４１头产后４０－１００天卵巢静止奶牛分为四个处理组：ＯＩＵＰＭＳＧ（ｎ＝１２）、１０００ＩＵＰＭＳＧ（ｎ＝１２）、１２５０ＩＵＰＭＳＧ（ｎ＝１２）及１５００ＩＵＰＭＳＧ（ｎ＝５），处理后一周内的排卵率分别为０．０％、８３．３３％、９１．６７％及４０．０％（Ｐ＜０．０１），从处理到妊娠间隔时间分别为８９．１±３６．７天、２９．８±２且．７天、５１．９±２５．２天及６０．２±２９．６天（Ｐ＜０．０１）；２９头试验母牛又按产后４０－６０天及产后６１－１００天分为两组，处理后一周内的排卵率分别为９２．９％及６６．７％（Ｐ＞０．０５），从处理到妊娠间隔时间分别为５０．３±２７．０天及３８．５±２７．０天（Ｐ＞０．０５）。结果表明，ＰＭＳＧ处理卵巢静止母牛具有明显效果，其中以１０００ＩＵ为最优，处理时间的早晚对处理效果无明显影响。 相似文献
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运输性应激对商品猪影响的研究 总被引：2，自引：0，他引：2
商品猪７２０头，每头体重７５～１００ｋｇ。按常规行车，经历２小时，行程５０ｋｍ的公路汽车运输试验观测．在运输过程中猪只表现兴奋、不安和互相干扰、咬斗等现象。运输结束后表现精神沉郁和食欲不振。对猪的生理状态影响显著，心博率显著加快；运输前平均为７５．５±４．６次／分钟，运输后平均为９９．２３±１４次／分钟（Ｐ＜０．０１）；呼吸率显著增加，运输前平均为１２．２５±３．４次／分钟．运输后平均为２４．３±３．２次／分钟．（Ｐ＜０．０１）；体温明显增高．运输前平均为３９．３±０．３℃，运输后平均为３９．９８±０．５℃（Ｐ＜０．０５）。体重耗损较大．运输前平均为８８．５±３．１ｋｇ，运输后平均为８４．７±２．５ｋｇ，耗重率平均为４．３％。病残猪为２５头（占３．４％），死亡８头（占１．１％）．共计为４．５％。 相似文献
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半胱胺对奶牛产奶量及血浆生长抑素、生长激素水平的影响 总被引：42，自引：1，他引：41
选用１０ 头处于泌乳中期的荷斯坦牛进行自身对照试验。对照期饲喂基础日粮,试验期在基础日粮中添加半胱胺。每隔５ 天一次,剂量为１００ｍｇ／ｋｇ 体重,共喂３ 次。结果表明,试验期奶牛日产奶量比对照期提高７ ．６ ％ （ 对照期１４ ．５ ±３ ．９ｋｇ／ 头,试验期１５ ．６ ±４ ．３ｋｇ／ 头Ｐ＜ ０ ．０５） ;奶牛采食量无明显变化,试验期饲料转化率比对照期明显提高（ 对照期０ ．３２ ±０ ．０１ ,试验期０ ．３０ ±０ ．０２ ,Ｐ＜ ０ ．０１） ;与对照期相比,试验期奶牛血浆生长抑素（ＳＳ） 水平明显下降（ 对照期１ ．２１ ±０ ．３４ｎｇ／ｍｌ,试验期０ ．１４ ±０ ．０５ｎｇ／ｍｌ,Ｐ（ ＜ ０ ．０１） ,生长激素含量显著提高（ 对照期１ ．３３ ±０ ．２６ｎｇ／ｍｌ,试验期１ ．７７ ±０ ．２９ｎｇ／ｍｌ,Ｐ＜ ０ ．０５） ;半胱胺对牛乳脂率无明显影响（ 对照期２ ．１６ ±０ ．５８ ,试验期２ ．５３ ±０ ．０６） 。以上结果表明,半胱胺能明显提高奶牛产奶量,而抑制体内生长抑素,提高内源性生长激素水平,可能为其主要的作用机制。 相似文献
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在生长肥育猪日粮中添加高铜（１８７．９０±２．７５ｍｇ）和超高铜（３６７．９０±０．５００ｍｇ），结果每千克肥育猪眼肌肉中铜元素平均值为１０．８０±０．２３ｍｇ和１１．３０±０．１１ｍｇ，比对照组增加了２．３倍和２．４倍差异显著（Ｐ〈０．０５），肝脏中平均值为１５４．９０±４．３０ｍｇ和４０７．５±５．３ｍｇ，比对照组增加３０．７３倍和３．５７倍，差异极显著（Ｐ〈０．０１）。特高铜组特出现肝脏肿大 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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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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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
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 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