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泰乐菌素在肉仔鸡日粮中的应用 总被引：1，自引：0，他引：1
选用ＡＡ公雏４８０只，随机分为５个处理（２０ｍｇ／ｋｇ酒石酸泰乐菌素；１０ｍｇ／ｋｇ酒石酸泰乐菌素；８．５ｍｇ／ｋｇ磷酸泰乐菌素；４０ｍｇ／ｋｇ金霉素；５０ｍｇ／ｋｇ洛克沙生），每个处理８个重复，每个重复１２只鸡，三阶梯笼养。试验表明：在用药期（１～６周）及整个试验期（１～７周）内，三个泰乐菌素处理组的增重高于金霉素和洛克沙生组，料肉比低于金霉素和洛克沙生组，但尚未达到统计学显著水平（Ｐ＞０．０５）；在肉仔鸡日粮中，添加１０ｍｇ／ｋｇ的酒石酸泰乐菌素即可发挥作用，将其添加量提高至２０ｍｇ／ｋｇ水平，并未进一步提高鸡的生产性能。从经济效益及环保和卫生角度考虑，肉仔鸡日粮中酒石酸泰乐菌素的添加水平以１０ｍｇ／ｋｇ为宜。 相似文献
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硫酸抗敌素在断奶仔猪日粮中的应用 总被引：1，自引：0，他引：1
实验通过与喹乙醇（５０ｍｇ／ｋｇ）、金霉素（１００ｍｇ／ｋｇ）对比，研究不同水平的硫酸抗敌素（２０，４０，８０ｍｇ／ｋｇ）在断奶仔猪日粮中的应用效果。结果表明，不同处理组间日增重差异不显著（ｐ＞０．０５）；８０ｍｇ／ｋｇ硫酸抗敌素组料重比显著低于１００ｍｇ／ｋｇ，金霉素（ｐ＜０．０５），但其他各处理组间差异不显著；整个试验期腹泻率不高，但以５０ｍｇ／ｋｇ喹乙醇和８０ｍｇ／ｋｇ硫酸抗敌素组较低。从三项指标来看，８０ｍｇ／ｋｇ硫酸抗敌素组效果较好。 相似文献
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为探讨添加不同抗生素对肉鸡肠道微生物的影响，本试验研究了添加不同剂量金霉素、硫酸抗敌素后21日龄肉鸡盲肠三种优势菌的菌群变化。结果表明：（1）添加金霉素、硫酸抗敌素可显著降低21日龄肉鸡盲肠中大肠杆菌的数量（P＜0．05），且随着抗生素剂量的增加，其数量继续降低。（2）添加20mg/kg的硫酸抗敌素可显著提高21日龄肉鸡盲肠中双歧杆菌的数量（P＜0．05）；添加50mg/kg的金霉素和10mg/kg硫酸抗敌素提高不显著（P＞0．05）。（3）添加不同剂量金霉素、硫酸抗敌素对21日龄肉鸡盲肠中乳酸杆菌的数量无显著影响（P＞0．05）。 相似文献
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肉鸡后期日粮中添加不同水平铜的饲养效应 总被引：6，自引：2，他引：4
将２８０ 只２１ 日龄商品代ＡＡ 肉鸡随机分成５ 组， 组内设两个重复， 基础日粮含铜为５ ．７ｍｇ／ｋｇ（ 测定结果） ，分别添加４ ．３ｍｇ／ｋｇ 、４４．３ｍｇ／ｋｇ 、８４ ．３ｍｇ／ｋｇ 、１２４．３ｍｇ／ｋｇ 、１６４ ．３ｍｇ／ｋｇ无机铜进行３ 周饲养试验，记录各组采食量（ＡＤＦＩ） ，测定日增重（ＡＤＧ） 和料重比（Ｆ／ Ｇ） 。结果表明：日粮铜水平影响ＡＤＧ、ＡＤＦＩ和Ｆ／Ｇ（Ｐ＜ ０．０５） ，随着铜浓度的上升，ＡＤＧ、ＡＤＦＩ呈下降趋势，Ｆ／ Ｇ 呈上升趋势， 高水平铜对肉鸡无增重效果。根据试验结果， 建议肉鸡后期日粮中铜给量为１０ｍｇ／ｋｇ 。 相似文献
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活菌制剂对肉鸡生产性能的影响 总被引：1，自引：0，他引：1
王占林 《河南畜牧兽医(综合版)》2000,(4)
江西农大黄国清等 ,用活菌制剂对肉鸡生产性能进行了试验。采用的活菌制剂由芽胞杆菌、嗜酸乳酸杆菌、保加利亚杆菌、双岐杆菌和嗜热链球菌组成 ,含活菌数１５×１０８ 个／ｇ。抗生素为１５%金霉素钙。取１日龄雏鸡３６０只 ,随机分成３组 ,每组设３个重复 ,每个重复４０只鸡。对照组０～２１日龄 :基础日粮 ３５ｍｇ／ｋｇ金霉素 ,２２～４９日龄 :基础日粮 ３５ｍｇ／ｋｇ金霉素。试验Ｉ组０～２１日龄 ,基础日粮 ０．２ %活菌制剂 ,２２～４９日龄 ;基础日粮 ０．２%活菌制剂。试验Ⅱ组０～２１日龄 :基础日粮 ３５ｍｇ／ｋｇ金霉… 相似文献
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本试验以1日龄海兰褐蛋用雏鸡400只做为试验对象,将其随机分成5个处理组,每组设4个重复,每个重复20只。其中设1个对照组,4个试验组。在试验期间对照组饲喂基础日粮,试验组分别饲喂基础日粮+0.01%低聚木糖、基础日粮+0.02%低聚木糖、基础日粮+0.03%低聚木糖和基础日粮+抗生素(盐酸恩诺沙星)。试验采用育雏笼常规饲养,自由采食、饮水。预试1周后开始试验,试验期5周。结果表明:低聚木糖能够提高雏鸡的生长性能和免疫机能。 相似文献
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大豆黄酮对肉仔鸡生产性能及其有关内分泌的影响 总被引：7，自引：0，他引：7
大豆黄酮属异黄酮类植物雌激素,具有促进动物生长、增加产蛋、增强机体免疫力、调节动物繁殖等生理功能,是一种有广阔开发应用前景的新型饲料添加剂。本试验旨在探讨在肉仔鸡饲养中适宜的大豆黄酮添加水平及异黄酮的作用机理。试验选用1日龄艾维茵商品代肉仔鸡240只,公母分养,公母分别随机分为4组,即对照组与3个试验组,每组30只,每组设3个重复,每重复10只。对照组喂基础日粮,试验Ⅰ组喂基础日粮+大豆异黄酮5m g/kg,试验Ⅱ组喂基础日粮+大豆异黄酮10m g/kg,试验Ⅲ组喂基础日粮+大豆异黄酮15m g/kg。试验分两个阶段饲料:即前期0～28日龄,后期2… 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