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甘氨酸亚铁对断奶仔猪生长性能及皮毛指标的影响 总被引：1，自引：0，他引：1
本试验旨在研究不同剂量甘氨酸亚铁对断奶仔猪生长性能的影响．以断奶日龄为28d的仔猪为试验动物．将210头仔猪随机分为7个处理组．处理I-Ⅲ组分别在基础日粮中分别添加铁元素0、100、220mg／kg（FeSO4的形式添加）。处理Ⅳ-Ⅶ组分别在添加FeSO4 100mg／kg基础上再添加甘氨酸亚铁30、60、90和120mg／kg。每个处理组设5个重复,每个重复6头仔猪。经35d的饲养试验,结果表明：甘氨酸亚铁能够显著提高断奶仔猪的日平均采食量和日增重．降低了料肉比及腹泻率。且能显著改善皮毛感官指标。其中添加90mg／kg甘氨酸亚铁的试验效果最优。综上所述．甘氨酸亚铁能够改善段奶仔猪的生长性能及皮毛状况。 相似文献
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本研究以断奶仔猪为试验对象,研究在断奶仔猪基础饲料中添加不同水平的大蒜素,对其生长性能及腹泻率的影响,并确定大蒜素的最适添加量。试验选择120头21日龄断奶的仔猪按照单因子试验设计,将其随机分为4个处理组,每组30头断奶仔猪。每组断奶仔猪分别饲喂含有0 mg/kg （对照组）、100 mg/kg （试验1组）、200 mg/kg （试验2组）、400 mg/kg （试验3组）的大蒜素基础饲料。预试验期1周,正式试验期4周,试验结束后记录断奶仔猪的平均日增重、料重比、腹泻率等指标。结果显示,试验2组和试验3组断奶仔猪的试验末重显著高于对照组（P<0.05）;平均日增重显著高于对照组（P<0.05）;料重比显著低于对照组（P<0.05）;腹泻率比对照组极显著降低了2.79、3.56个百分点（P<0.01）。综上所述,断奶仔猪养殖生产中添加200 mg/kg的大蒜素可以有效改善其生长性能,并且极显著降低腹泻率。 相似文献
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试验研究了复制3种生长促进剂组合使用对断奶仔猪生产性能的影响。试验选择128头28±1日龄、平均断奶体重（7．78±0．74）kq的健康三元（杜×长×大）杂交仔猪，按体重和性别分成4个处理组，每个处理4个重复，每个重复8头仔猪。第1组为对照组，饲喂玉米-豆粕型基础日粮；第2组添加喹乙醇（50mg／kg）、阿散酸（150mg／kg）；第3组添加喹乙醇（50mg／kg）、吉他霉素（60mg／kg）；第4组添加喹乙醇（50mg／kg）、阿散酸（150mg／kg）、吉他霉素（60mg／kg）。研究结果表明，各试验组日增重、料肉比得到显著改善（p〈0．05），腹泻率显著下降（p〈0．01）。 相似文献
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选用21~23日龄"杜×长×大"断奶仔猪120头,研究天蚕素抗菌肽替代杆菌肽锌对断奶仔猪生产性能及腹泻的影响。试验仔猪按完全随机区组设计分为5个处理,每个处理3个重复,每个重复8头仔猪,对照组饲喂基础日粮+硫酸粘杆菌素(20 mg/kg)+杆菌肽锌(40 mg/kg),试验一、二、三组分别用200、300、400 mg/kg天蚕素抗菌肽全部替代对照组日粮中的杆菌肽锌,试验四组饲喂对照组日粮+天蚕素抗菌肽200 mg/kg,试验期14 d。结果表明:试验一组平均日增重比对照组降低了11.35%(P<0.05)、饲料转化率降低了4.55%(P<0.05),试验二、三、四组平均日增重、饲料转化率与对照组相比均无显著差异(P>0.05),试验三、四组平均日增重与试验一组相比差异显著(P<0.05),各组间的腹泻率与腹泻频率均无显著差异(P<0.05),用400 mg/kg天蚕素抗菌肽替代40 mg/kg杆菌肽锌断奶仔猪的生产性能最好。 相似文献
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高剂量锌及抗生素对预防断奶仔猪腹泻和促生长的影响 总被引：2，自引：0，他引：2
将40头28日龄断奶杂交仔猪分为5组，分别饲喂基础日粮、抗生素(硫酸黏杆菌素10mg／kg 利高霉素25mg／kg)和高剂量锌(1、3、5g／kg)，观察了高剂量锌、抗生素对断奶仔猪腹泻和生长的影响。试验结果表明，抗生素和高剂量锌均能提高仔猪的日采食量和日增重，并能大幅度降低仔猪腹泻率，从饲料转化率和预防腹泻效果来看，以添加3g／kg氧化锌的效果较好。 相似文献
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试验旨在研究口服右旋糖酐铁对断奶仔猪生长性能和血清指标的影响。将72头断奶仔猪随机分成4组,每组9个重复,每个重复2头仔猪。对照组在基础日粮中添加625 mg/kg甘氨酸铁（含铁16%）,3个试验组分别在日粮中添加50、100、200 mg/kg的右旋糖酐铁（含铁15%）,即50 mg/kg组、100 mg/kg组、200 mg/kg组。试验期35 d。结果显示：与对照组相比,200 mg/kg组仔猪平均日增重显著升高（P<0.05）,料重比显著降低（P<0.05）;50 mg/kg组、100 mg/kg组仔猪的平均日增重显著升高（P<0.05）。与对照组相比,100 mg/kg组断奶仔猪血红蛋白浓度显著提高（P<0.05）。研究表明,与甘氨酸铁相比,口服右旋糖酐铁可较好地促进断奶仔猪生长,提高血红蛋白浓度。 相似文献
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本研究在“杜×长×大”断奶仔猪基础饲料中添加不同水平的黄芪多糖,研究黄芪多糖对断奶仔猪生长性能及腹泻率的影响。试验选取体况健康的21日龄断奶仔猪100头,随机分为4组（每组5个重复,每个重复5头仔猪）,基础饲料组为对照组,基础饲料+200 mg/kg黄芪多糖为试验1组、基础饲料+400 mg/kg黄芪多糖为试验2组、基础饲料+600mg/kg黄芪多糖为试验3组。预试期1周,正试期4周。试验结束后,记录断奶仔猪的体重、采食量、腹泻率等指标。结果表明,试验2组和试验3组断奶仔猪的试验末体质量和平均日增重显著提高（P<0.05）;试验2组和试验3组断奶仔猪的料重比显著降低（P<0.05）。试验1组、试验2组、试验3组断奶仔猪的腹泻率分别比对照组极显著降低1.52、2.99、3.96个百分点（P<0.01）,试验3组的效果最明显。表明在断奶仔猪日粮中添加400 mg/kg、600 mg/kg的黄芪多糖可以显著改善仔猪的生长性能,并降低腹泻率。 相似文献
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试验旨在研究不同铜源对断奶仔猪生长性能、腹泻率和皮毛性状的影响。选择144头平均体重(7.5±0.67)kg的21日龄"D×L×Y"三元杂交断奶仔猪随机分成4个组,每组3个重复,每个重复12头猪。对照组饲喂基础日粮,基础日粮中使用硫酸铜120 mg/kg(以铜计),试验Ⅰ、试验Ⅱ、试验Ⅲ组分别添加甘氨酸铜20、50、120 mg/kg。试验期28 d,试验开始和结束分别称重,并计算腹泻率和皮毛性状指数。结果表明:添加甘氨酸铜能够提高断奶仔猪的平均日采食量和平均日增重,降低料肉比;其中硫酸铜和甘氨酸铜对腹泻率的控制差异不显著;添加甘氨酸铜能够有效改善皮毛性状。 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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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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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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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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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 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