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生菌素在断奶仔猪日粮中的应用 总被引：3，自引：0，他引：3
近年来，微生态制剂在畜牧生产和动物保健方面的应用越来越受到人们的重视，该类制剂具有维持和恢复动物胃肠道微生物平衡，防治疾病，促进有机物消化利用，提高动物生产性能等多种功效。生菌素是广州市希普生物饲料有限公司研究开发的一种微生态制剂新产品，它是以数种具... 相似文献
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为了研究日粮中添加不同微生态制剂对肉羊生产性能的影响,笔者选择体重相近的3～4月龄小尾寒羊公羊60只,随机平均分为对照组（基础日粮）、试验Ⅰ组（基础日粮+2 kg/t复合酵母菌制剂）、试验Ⅱ组（基础日粮+1 kg/t黑曲霉制剂）和试验Ⅲ组（基础日粮+2 kg/t复合酵母制剂+1 kg/t黑曲霉制剂）展开试验。预饲期15 d,正式试验期30 d。试验期内,3组试验组与对照组相比,平均日增重、采食量均有大幅提高,料重比显著降低（P<0.05）。尤其是试验Ⅰ组,与对照组相比,其平均日增重达到236.45 g/d,提高了48.19%,差异极显著（P<0.05）;料重比降低39.01%,差异极显著（P<0.05）。研究表明,在肉羊日粮中添加不同比例的微生态制剂能明显提高其生产性能,以添加2 kg/t效果最佳。 相似文献
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复合微生态制剂对蛋鸡生产性能、生化指标和饲粮养分代谢率的影响 总被引：1，自引：0，他引：1
本试验在蛋鸡基础日粮中添加不同水平的复合微生态制剂,研究复合微生态制剂对蛋鸡生产的影响,从生产性能指标、血液生化指标、饲粮养分代谢率3个方面加以分析[1],探讨复合微生态制剂在蛋鸡生产中的应用效果,为其在畜禽生产中的推广应用提供理论依据。 相似文献
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饲用微生态制剂在断奶仔猪日粮中的应用效果 总被引：2，自引：0，他引：2
随着微生态制剂技术的进一步发展，专门针对一类动物的特异性微生态制剂产生了。为了探讨此类产品的使用效果，选用广州市希普生物饲料有限公司生产的仔猪型生菌素（普乐宝）进行了本次试验，观察对断奶仔猪日增重、肉料比、成活率及防止腹泻等方面的影响。1材料与方法1．1试验时间和地点本试验于1999年5月26日至6月15日在广东省农科院良种猪育种中心进行，试验时间为20天。1．2试验动物的选择与分组选择同一栋猪舍内出生日龄相近、体重相似。健康状况一致的28日龄断奶社×长二元杂仔猪52头，随机分成两组，每组26头。1．3试验内容对照组：… 相似文献
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微生态制剂对蛋鸡产蛋后期生产性能及粪中氨气产生量的影响 总被引：2，自引：2，他引：0
本试验在蛋鸡日粮中添加不同水平的微生态制剂,研究其在蛋鸡生产中的应用效果以及适宜的使用剂量,并分析其对粪中氨气产生量的影响,为微生态制剂在畜禽生产中的推广应用提供理论依据. 相似文献
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缓解奶牛热应激的添加剂 总被引：9，自引：3，他引：6
奶牛是一种怕热耐寒的动物。每年夏季高温天气,我国南方大部分地区奶牛发生不同程度的热应激反应,严重影响奶牛生产和健康。许多研究发现,日粮中加入某些药物添加剂,可以缓解热应激对奶牛的不良影响。 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