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本试验用粪分析法对蛋氨酸锌饲喂奶牛的表现吸收率进行了测试。试验分３组，每组同质奶牛４头，３组分别在饲料中按日粮加入６ｍｇ／ｋｇ、２０ｍｇ／ｋｇ、６０ｍｇ／ｋｇ锌含量的蛋氨酸锌。试验结果，３组奶牛的表观吸收率依次为８５．０２％、７３．２９％、６４．６６％。结果表明奶中锌不能和蛋氨酸锌的添加量成比例地增长，饲料中锌的食入量较低，奶中锌的表观吸收率较高。饲料中蛋氨酸锌的添加量以２０ｍｇ／ｋｇ左右为宜。这项研究结果为奶牛饲喂蛋氨酸锌制取高锌奶提供了依据。 相似文献
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硒锌联合应用对奶牛抗氧化功能影响的试验 总被引：2，自引：0，他引：2
硒、锌作为畜禽微量元素添加剂的必需成分,在机体内发挥着重要的生物学作用。对动物机体抗氧化功能的影响有许多报道,但硒、锌的联合应用对奶牛抗氧化系统的影响尚未见报道,故我们作了如下实验。１ 材料及方法选某奶牛场１５头荷斯坦奶牛,随机分为三组,第１组为对照组,饲喂基础日粮;第２组在每千克基础日粮中添加亚硒酸钠０－２２毫克;第３组在添加亚硒酸钠的同时补加硫酸锌１２毫克／千克饲料,分别于０天、３０天、６０天、９０天采集全血进行相关酶和微量元素的分析,并对奶牛的营养及整体状况每隔１０天详细检查一次。对ＧＳＨ… 相似文献
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氧化锌和蛋白锌对仔猪生长性能和饲料养分消化的影响 总被引：2，自引：0，他引：2
为了研究不同化学形式的锌对仔猪生长性能和饲粮营养物质消化率的影响 ,采用１４７头“杜长大”仔猪 ,随机分为７组 ,每组３个重复 ,分别饲以添加１００ｍｇ／ｋｇ、２００ｍｇ／ｋｇ、３０００ｍｇ／ｋｇ无机锌（氧化锌） ,１００ｍｇ／ｋｇ、２００ｍｇ／ｋｇ 有机锌（蛋白锌）及１００ｍｇ／ｋｇ、２００／ｍｇ／ｋｇ酪蛋白的相同饲粮 ,进行了为期３０天的饲养试验 ,并在饲养试验后期以Ｃｒ２Ｏ３ 为外源指示剂进行了消化试验。结果表明 ,饲粮中添加３０００ｍｇ／ｋｇ无机锌和２００ｍｇ／ｋｇ 蛋白锌使仔猪日增重分别提高了２１．２４ … 相似文献
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产蛋种鸡日粮中不同水平维生素E与有机和无机硒的效果研究 总被引：17，自引：2，他引：15
在３×５的两因子试验中,研究了不同添加水平维生素Ｅ（４、１４和２４ｍｇ／ｋｇ）与有机和无机硒（亚硒酸钠０．２０、０．３５和０．５０ｍｇ／ｋｇ,酵母硒０．３５和０．５０ｍｇ／ｋｇ）对褐壳蛋种母鸡在２０～４０周龄阶段生产繁殖性能和有关血液指标的影响。结果表明,产蛋母鸡的采食量、产蛋率、蛋重、产蛋量、饲料转化率和死淘率在３个维生素Ｅ添加水平间无差异;除了添加酵母硒０．５０ｍｇ／ｋｇ组蛋鸡的蛋重和产蛋量显著低于酵母硒０．３５ｍｇ／ｋｇ组以外,其它各项生产性能指标在各硒处理组间差异不明显。维生素Ｅ和硒可增加彼此在血液中的存留;当日粮中只补加维生素Ｅ４ｍｇ／ｋｇ时,将日粮亚硒酸钠硒添加水平由０．２０ｍｇ／ｋｇ提高到０．３５～０．５０ｍｇ／ｋｇ可使血浆α－生育酚含量由０．５０μｇ／ｍｌ上升到接近１．０μｇ／ｍｌ左右。 相似文献
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为了探讨地氟病黄牛血甭钙磷和碱性磷酸酶（ＡＬＰ）活性及硒铜镁田间防治效果。３２头自然生长的高氟黄牛,随机分为４组,每组８头,其中１组为高氟对照组;２组为高氟黄牛每日添加０．２５ｍｇ／ｋｇ硒（亚硒酸钠）;３组为高氟黄牛每日添加１５ｍｇ／ｋｇ铜（硫酸铜）;（４）组为高氟黄牛每日添加０．２５ｍｇ／ｋｇ硒＋１５ｍｇ／ｋｇ铜＋１ｍｇ／ｋｇ镁（硫酸镁）。另设正常对照奶黄牛各８头,连续饲喂８３天,分别于的０天、 相似文献
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用４２头７月龄安格斯公牛进行试验,测定加钼或未加钼的低铜饲粮对牛的生产性能,胴体品质和铜状态的长期影响。断奶前２８ｄ给２２头犊牛注射９０ｍｇ断奶后,饲粮中添加铜７．５ｍｇ／ｋｇ干物质,对照组不添加铜。在获得铜后第４０ｄ后,铜的添加量降低到５ｍｇ／ｋｇ干物质,施铜期后,每组１／２牛的日粮中添加钼５ｍｇ／ｋｇ干物质。 相似文献
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高铜日粮铁,锌水平对猪血液生理生化指标与生产性能的影响 总被引：5，自引：0，他引：5
在高铜（２５０ｍｇ／ｋｇ）日粮中加铁、锌,可显著（Ｐ＜０．０５）或极显著（Ｐ＜０．０１）地增加血红蛋白（Ｈｂ）浓度,血清铁、锌含量和血清碱性磷酸酶（ＳＡＰ）活性,增强红细胞膜（ＲＢＣＭ）稳定性,减少血清铜含量。当日粮中加铁６０ｍｇ／ｋｇ（日粮铁总浓度１５３ｍｇ／ｋｇ）、锌１０５ｍｇ／ｋｇ（日粮锌总浓度１４２ｍｇ／ｋｇ）时,猪血清铁和锌含量、血液Ｈｂ浓度、ＳＡＰ活性、ＲＢＣＭ稳定性达到最大。在高铜日粮中加铁４０～６０ｍｇ／ｋｇ（日粮铁总浓度１３３～１５３ｍｇ／ｋｇ）、加锌７０～１０５ｍｇ／ｋｇ（日粮锌总浓度１０７～１４２ｍｇ／ｋｇ）,能增加猪平均日增重７５．１５％～７６．０７％（Ｐ＜０．０１）,提高饲料转化率６０．１１％～６０．７７％（Ｐ＜０．０１）。结果表明,猪高铜（２５０ｍｇ／ｋｇ）日粮中铁、锌的适宜水平分别为１５３ｍｇ／ｋｇ和１４２ｍｇ／ｋｇ。 相似文献
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洛克沙胂对生长猪生长性能的影响 总被引：2，自引：0，他引：2
本试验研究日粮中添加不同剂量的洛克沙胂（４０ｍｇ／ｋｇ、５０ｍｇ／ｋｇ）、喹乙醇（５０ｍｇ／ｋｇ）和洛克沙胂（５０ｍｇ／ｋｇ）＋喹乙醇（５０ｍｇ／ｋｇ）对生长猪生长性能的影响。试验结果表明,不同剂量洛克沙胂组、喹乙醇组及洛克沙胂＋喹乙醇组的日增重明显优于对照组（Ｐ＜０．０５）;４０ｍｇ／ｋｇ与５０ｍｇ／ｋｇ洛克沙胂和５０ｍｇ／ｋｇ喹乙醇＋５０ｍｇ／ｋｇ洛克沙胂三组的料肉比也显著的低于对照组（Ｐ＜０．０５）;从经济效益上分析,生长猪日粮中添加４０ｍｇ／ｋｇ洛克沙胂的经济效益较好。 相似文献
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阿散酸和土霉素对肉牛增重效果的影响 总被引：1，自引：0，他引：1
选择体重相近,健康的南阳黄牛６０ 头,平均分为３ 组（ 组间体重差异不显著）。试验Ⅰ组饲粮为基础日粮＋ １２０ｍｇ／ｋｇ 的阿散酸＋ １２０ｍｇ／ｋｇ 的土霉素。试验Ⅱ组饲粮为基础日粮＋１００ｍｇ／ｋｇ 的阿散酸＋ １００ｍｇ／ｋｇ 的土霉素,对照组饲粮为基础日粮,３ 组经过一个月的对比试验表明,试验Ⅰ组和试验Ⅱ组都比对照组的平均日增重高,分别高３９ ．１７ ％ 和２７ ．３２ ％ ,以每千克增重计算饲料开支,试验Ⅰ组比对照组可节约１ ．７６ 元,比试验Ⅱ组可节约０ ．４２ 元 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