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加酶益生素添加时间对哺乳断奶仔猪日增重和腹泻率的影响 总被引：8，自引：0，他引：8
将 2 0窝杜斯哺乳仔猪随机分为两组 :试验组和对照组。试验组哺乳仔猪 0～ 7天通过涂抹益生素接种 ,7～ 35天饲喂含加酶益生素的饲料 ,断奶仔猪饲喂含加酶益生素的饲料 ;对照组哺乳仔猪 7～ 35天按常规以基础料诱食补食 ,断奶仔猪饲喂含加酶益生素的饲料。试验结果表明 :试验组哺乳仔猪日增重比对照组提高 11.4 2 % (P <0 .0 1) ,腹泻率比对照组降低 37.5 2 % (P <0 .0 5 ) ;试验组断奶仔猪日增重比对照组提高 7.0 9% (P >0 .0 5 ) ,腹泻率比对照组低4 6 .5 6 % (P <0 .0 1)。加酶益生素的添加时间不仅影响哺乳仔猪的日增重 ,而且影响断奶仔猪的腹泻率 ;哺乳仔猪 0～7天涂抹益生素接种 ,哺乳断奶全程使用加酶益生素可有效提高哺乳仔猪日增重 ,降低断奶仔猪腹泻率 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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《饲料工业》2016,(2)
为了研究在断奶仔猪日粮中补充益生素控制抗生素、氧化锌用量的养殖效果,以杜长大三元杂交断奶仔猪为试验对象,以新型的益生素为试验材料,在日粮中分别补充0.5、1.0 g/kg的新型益生素,通过28 d的养殖试验,结果表明,去除喹乙醇、那西肽,减少硫酸抗敌素、氧化锌,并补充益生素后,仔猪的增重有提高的趋势、饲料系数有下降的趋势,可以维持断奶仔猪的生长速度和饲料效率。同时,血清总胆汁酸水平有所提高,0.5 g/kg组差异不显著,1.0 g/kg组差异显著。添加0.5 g/kg新型益生素组,仔猪的腹泻率有所下降。试验结果表明,在断奶仔猪饲料中使用益生素,可以大幅降低饲料中抗生素的用量,并有减少仔猪腹泻、提高增重的趋势。 相似文献
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仔猪阶段是猪一生中生长发育迅速、可塑性大、对饲料和饲养管理要求最高的一个关键时期,断奶仔猪由于断乳以及饲料和环境的变化而出现应激,常导致腹泻、体弱、生长停滞甚至死亡.长期以来,人们一直采用在日粮中添加抗菌素的手段以控制仔猪腹泻,维持仔猪健康和正常生长发育.但大量使用抗菌素,所产生的抗药性问题及药物残留毒副作用日趋严重,已引起各国的普遍关注,禁用抗菌素作饲料添加剂的呼声日高.因此研制和应用抗菌素的替代品已成必然趋势,能替代抗菌素而又无其毒副作用的高效饲料添加剂——益生素应运而生.应用益生素可降低畜禽应激,改善动物健康状况和生产性能.为了验证益生素对断奶仔猪的添饲效果,为推广应用益生素提供科学依据,我们于1996年10月至11月进行了本次研究. 相似文献
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抗生素的耐药性以及药物残留问题引发了人们对新型饲料添加剂的研究,益生素为人们解决这一问题带来了希望。文章就益生素及其对仔猪腹泻的防治进行了综述,首先阐述了益生素的特点、分类和组成成分以及作用机理,然后介绍了引起仔猪腹泻的各种因素,进而分析了益生素如何能够降低仔猪腹泻,维护仔猪肠道健康。 相似文献
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益生素及其在仔猪饲养中的应用 总被引：1，自引：0，他引：1
在饲料工业中,人们将益生素作为抗生素最有效的替代产品之一,寄希望于通过益生素来生产安全的畜产品,同时强化对环境的保护。笔者从益生素的分类及在防治仔猪腹泻、提高仔猪生产性能上的应用等方面进行了综述,探讨益生素在生产和使用过程中应注意的问题,以及益生素推广应用中存在的问题及发展前景。 相似文献
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选用120头15kg左右健康、公母各半的杜×长×大三元杂交断奶仔猪,随机分为4组,每组三个重复,每重复10头.其中第1组饲喂基础日粮,第2组基础日粮中添加0.2%的益生素,第3组基础日粮中添加0.2%复合酶制剂,第4组添加0.2%的益生素+酶制剂.结果表明添加益生素组、添加酶制剂组和益生素+酶制剂组与基础日粮组相比,日增重分别提高1.85%、3.00%和8.99%;料重比分别降低2.98%、3.83%和4.68%;腹泻率分别下降20.38%、8.81%和30.04%.粗蛋白质表观消化率分别提高5.01%、1.92%和2.90%;粗纤维消化率分别提高了27.88%、18.80%和1.96%.说明生物饲料添加剂可有效提高仔猪生产性能和饲料营养成分利用率,是一种较为安全、高效的饲料添加剂. 相似文献
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益生素对断奶仔猪效果试验 总被引：10，自引：0，他引：10
50头杜长大断奶仔猪随机分为试验与对照组 (各 2 5头 ) ,试验组仔猪饲粮添加 0 .1%益生素 ,对照组不加 ,饲养 30天。结果 ,试验组仔猪比对照组日增重提高 15 .65 % ( P<0 .0 5 ) ,饲料利用率提高了14.5 3% ,头均毛利润增加 15 .64 %。 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