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"杏富益生素"与抗生素饲喂肉鸡的对比试验 总被引：1，自引：0，他引：1
范志伟 《兽药与饲料添加剂》2002,7(1):9-9
许多研究表明,益生素具有类似抗生素的抑菌作用,并有较好的促生长、提高饲料利用率的效果.本试验通过肉用鸡对比饲养试验,探讨杏富益生素、土霉素碱对肉鸡增重和饲料利用率的影响.试验于2001年2月27日至4月进行. 相似文献
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益生素、寡糖对三黄鸡生产性能及免疫机能的影响 总被引：9，自引：0，他引：9
将1日龄广东三黄鸡160只，随机分成5组，即对照组，试验1组(添加0．3％的益生素)，试验2组(添加0．2％的寡糖)，试验3组(添加0．3％的益生素和0．2％的寡糖)，试验4组(添加0.2％的益生素和0．1％的寡糖)，研究益生素和寡糖对肉鸡生产性能与免疫机能的影响。结果表明：饲料中添加益生素或寡糖均能显著提高肉鸡的平均日增重、饲料转化率、免疫器官指数、白细胞吞噬率及新城疫抗体效价，降低肉鸡死亡率。寡糖的作用效果前4周较明显．而益生素4周后较明显。同时添加益生素和寡糖对提高肉鸡生产性能与免疫机能具有协同作用。 相似文献
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为生产绿色肉鸡，在肉鸡饲料中添加适量的产酶益生素、溢康素、产酶益生素 道多酶，鸡的生长速度、饲料转化率、成活率和经济效益，都达到或超过了添加抗生素的效果，但以同时添加产酶益生素和溢多酶的效果最好。1～21日给添加2‰产酶益生素 10‰溢多酶，22～49日给添加10‰产酶益生素 10‰溢多酶替代抗生素，可提高成活率11％，提高经济效益23．08％。 相似文献
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益生素应用于规模化养猪业的效果 总被引：3，自引：1，他引：2
本文综述了益生素在规模化养猪业中的应用效果，阐明了益生素的作 理及其影响因素，通过分析着重强调益生素添加到猪日粮中，可 减少仔猪腹泻、降低仔猪死亡率、提高母猪繁殖力、提高饲料报酬等，说明益生素是一种具有良好市场前景的饲料添加剂。 相似文献
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郝忠存 《兽药与饲料添加剂》2000,(3):20-20
基于目前市场上对绿色饲料的迫切需要，我们选用酶制剂和益生素两种天然生长促进剂和在安全量以内的阿散酸及添加药物添加剂的市售饲料来作试验，比较其对肉鸡的生长、饲料转化率等方面的影D向。试验地为菏泽旺达畜禽养殖有限公司试验场，试验时间为1999年8月12日至9月10日，历时29天。选择的雏鸡为某场AA品种，随机分为①对照组，②0．15％酶制剂组，③0．O05％阿散酸组，④0．15％益生素组。参照NRC（肉鸡营养需要｝（1994版）配制日粮，所喂饲粮分前期料，后期料。2、3、4组日粮营养组成和营养水平相同，与第1组略有差别。试验鸡群分… 相似文献
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《中国兽医杂志》2017,(7)
为了探讨不同浓度的同源益生素对肉鸡肌肉品质和肌肉组织学性能的影响,试验采用分组试验的方法,选用1 500羽1日龄AA肉仔鸡,公母各半,随机分成5组,分别为对照组、不同浓度的同源益生素0.1%、0.2%、0.3%、0.4%组,每组设10个重复,每个重复30羽,试验期为42 d。结果表明,在肉鸡饲料中添加不同浓度的同源益生素对肉鸡肌肉品质(剪切力、系水力、p H值等)方面均好于对照组,0.3%组更佳;同时同源益生素组肌纤维密度变大、肌纤维面积变小、肌纤维直径变小;综合分析,肉鸡饲料中添加同源益生素可以使肌肉的品质变好,肌肉更加鲜嫩,尤其以0.3%浓度效果最佳。 相似文献
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美国新型饲料添加剂的进展 总被引：2，自引：0，他引：2
美国新型饲料添加剂的进展化工部规划院李玲美国８０年代开发六类新型饲料营养、促进健康和生长添加剂，它们是益生素、酶制剂、基因工程产品、诊断助剂、再分配剂和抗病毒剂。现简介如下，供国内饲料添加剂研究与生产者参考。一、益生素益生素是根据微观生态平衡与生态失... 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