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复合酸化剂对仔猪生长性能及腹及腹泻的影响 总被引:1,自引:0,他引:1
试验选取24头28日龄、体重8.4千克左右的杜长大三元杂交仔猪,随机分成2组,每组2个重复,每个重复6头猪。分别饲喂玉米-豆粕型基础饲粮和在此基础上添加0.2%复合酸化剂的饲粮。结果表明:添加酸化剂能提高仔猪日增重9.2%(P〈0.05),降低料肉比8.7%,降低腹泻率42%(P〈0.05)。 相似文献
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选用144头(28±2)日龄的长×大二元杂交断奶仔猪,随机分为3个组,每组8个重复栏,每个重复栏6头仔猪(公母各半),基础饲粮添加了2000mg/kg锌(氧化锌),在此基础上分别添加0,40,60ms/kg的锌(有机锌),用以研究高锌饲粮中添加不同水平有机锌对仔猪生长性能和血清生化指标的影响。结果表明:饲粮中以有机锌形式添加锌40,60mg/kg,使断奶仔猪平均日增重分别提高了9.87%(P〈0.05)和20.40%(P〈0.05),日耗料量分别提高了5.09%(P〈0.05)和10.40%(P〈0.05),料重比则分别降低了4.29%(P〈0.05)和8.59%(P〈0.01),且添加60mg/kg的效果好于40mg/kg;使断奶仔猪腹泻率降低了50%以上,并显著提高了血清碱性磷酸酶、谷丙转氨酶、谷草转氨酶的活性(P〈0.05),显著降低了血清尿素氮水平(P〈0.05),但对血清锌、白蛋白和总蛋白含量没有显著影响(P〉0.05)。 相似文献
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复合酸化剂对断奶仔猪生长性能、胃肠道酸度及消化酶活性的影响 总被引:8,自引:0,他引:8
选择28日龄断奶、体重(6±1.04)kg的杜长大杂种健康仔猪200头,按遗传和体重相近的原则随机分为5个处理组,每组4个重复,每个重复10头猪。对照组在每千克基础饲粮中添加15mg黄霉素(1组),不添加酸化剂;4个试验组分别在基础饲粮中添加0.1%磷酸型酸化剂(2组)、0.3%磷酸型酸化剂(3组)、0.1%乳酸型酸化剂(4组)和0.3%乳酸型酸化剂(5组)代替等量玉米,均不添加抗生素。研究并比较了两种酸化剂以不同水平添加时对断奶仔猪生长性能、胃肠道酸度及消化酶活性的影响。结果表明,添加磷酸型酸化剂和乳酸型酸化剂均可显著增加仔猪日采食量、提高日增重、改善饲料转化率、降低腹泻率,其中以添加0.3%乳酸型酸化剂效果最佳;添加磷酸型酸化剂和乳酸型酸化剂都可显著降低仔猪胃和十二指肠食糜pH,显著提高仔猪胃蛋白酶和胰蛋白酶活性。 相似文献
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本试验旨在研究不同剂型的酸化剂对40日龄以前乳猪采食量、蛋白质消化能力和生产性能的影响。选择母猪体况、胎次和仔猪初生重相近.出生10日龄左右仔猪12窝(DLY、约120头),随机分为3组、每组4个重复、每个重复1窝(约10头),分别饲喂添加了脂埋型酸化剂(2k鲈)、混合型酸化剂(2k矾)和不添加酸化剂的日粮,统计哺乳期间的采食量。所有试验猪均在25日龄断奶、称重,并按性别、体重大小进行调整以确保各试验组猪之间性别和体重保持一致,进入第二个试验期。试验结果表明:哺乳期间脂埋型酸化剂组猪的采食量比混合型酸化剂组猪的采食量提高32.0%(P〈0.01),比对照组提高23.6%(P〈0.05);混合型酸化剂组猪采食量比对照组猪采食量降低12.4%(P〈0.05)。保育前期(26~40日龄)脂埋型酸化剂组采食量、增重和蛋白质表观消化率分别比混合型酸化剂组提高提高16.4%(P〈0.05)、19.5%(P〈0.01)和6.3%(P〈0.05),而混合型酸化剂组猪采食量、增重和蛋白质表观消化率与对照组猪采食量、增重和蛋白质表观消化率基本一致。由此可见.加工工艺所形成的不同剂型可以显著地影响复合型酸化剂的使用效果,其中以脂埋型酸化剂的使用效果最佳. 相似文献
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选择8kg左右的杜洛克X长白×大白三元杂交猪60头,随机分为2个组,每组设5个重复,每重复10头猪。进行为期52d的饲养试验,研究饲粮中添加屎肠球菌(商品名:康福特)对断奶仔猪生产性能及腹泻率的影响。试验结果表明:试验组比对照组平均日增重提高了15.98%(P〈0.05),从饲料转化率来看,试验组比对照组提高了9.19%(P〈0.O5)。与对照组相比,添加屎肠球茵腹泻率和腹泻指数均显著降低(P〈0.05),粪便中乳酸杆菌和双歧杆菌数量明显增加(P〈0.05),大肠杆菌数量明显降低(P〈0.O5)。屎肠球菌能显著提高仔猪的生产性能,改善肠道微生物平衡。 相似文献
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植酸酶和木聚糖酶对断奶仔猪生长性能及蛋白质利用率的影响 总被引:1,自引:0,他引:1
本试验研究了在饲粮中添加植酸酶和木聚糖酶对断奶仔猪生长性能及蛋白质利用率的影响。采用完全随机设计.将90头35日龄的断奶仔猪分为5组.每组3个重复.每个重复6头。5个处理组分别为:(1)玉米-豆粕基础日粮(正对照组.PC),(2)基础日粮-75%磷酸氢钙(负对照组.NC).(3)负对照组+植酸酶(植酸酶组,phy),(4)负对照组+木聚糖酶(木聚糖酶组,xy),(5)负对照组+植酸酶+木聚糖酶(植酸酶-木聚糖酶组,phy—xy).植酸酶的添加量为750U/kg,木聚糖酶的添加量为4000U/kg。结果表明:低磷饲粮添加植酸酶或木聚糖酶后.平均日增重和平均日采食量都得到了明显改善(P〈0.05).植酸酶和木聚糖酶同时添加对仔猪平均日增重的改善极显著(P〈0.01)。在低磷口粮组单独添加植酸酶或同时添加植酸酶和木聚糖酶极显著提高了蛋白质生物学价值(P〈0.01)。饲粮加酶后,血清尿素氮浓度显著降低(P〈0.05).添加植酸酶或同时添加植酸酶和木聚糖酶后.血清总蛋白浓度显著升高(P〈0.05).但添加酶对蛋白质表观消化率无显著影响.总之.在断奶仔猪低P日粮中添加植酸酶或木聚糖酶都不同程度地改善了仔猪生长性能.促进了蛋白质的利用.二酶同时添加对仔猪的平均日增重有显著的协同效应. 相似文献
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选用91日龄,体重32Kg左右.健康杜X长大三元杂交仔猪110头,随机分为三组。1组35头、2组37头、3组38头,分别以饲粮添加15%、30%、45%的马铃薯全粉替代玉米作为试验组。选用84日龄,体重27Kg左右,健康杜X长大三元杂交仔猪110头,不添加马铃薯全粉作为对照组。4组均采用同一基础饲粮与环境条件。试验期为89天,(2009年1月29日~4月28日)。结果表明:添加马铃薯全粉试验组与对照组相比(60-110kg阶段),日采食量1组降低2.86%(P〈0.05),2组降低无显著变化(P〉0.05),3组降低2.86%(P〈0.05);日增重1组减少2.09%(P〈0.05),2组增加24.73%(P〉0.01),3组减少4.52%(P〈0.05);单位饲料增重成本。1组每头出栏猪降低2.13元,2组降低4.62元。3组降低6.51元。在试验中,其中2组(饲粮中添加30%的马铃薯全粉),日采食量与日增重明显高于1组和3组。且每头出栏猪饲料成本降低10.22元。 相似文献
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本试验选用28日龄断奶、平均体重7.00±0.10kg的长白猪(♂)×大白猪(♀)二元杂交仔猪64头,研究在玉米-豆粕-膨化大豆型基础日粮中单独添加或联合使用包被复合酸化剂与抗生素对断奶仔猪肠道微生物和肠黏膜抗体的影响。试验设4个处理,每个处理4个重复,每个重复4头猪(公母各半),饲养试验时间为5周。结果表明,与对照组和抗生素处理组相比,缓释复合酸化剂与抗生素联合使用可以极显著提高仔猪盲肠和结肠中乳酸杆菌数量、降低大肠杆菌数量(P〈0.01);与酸化剂处理组相比,缓释复合酸化剂与抗生素联合使用可以显著提高仔猪盲肠中乳酸杆菌数量.降低大肠杆菌数量(P〈0.05);缓释复合酸化剂与抗生素联合使用还有增加仔猪肠黏膜抗体SIgA分泌量的趋势,但与其他处理组相比较,差异并不显著(P〉0.05)。结果提示,缓释复合酸化剂与抗生素在断奶仔猪饲粮中联合使用,可以优化仔猪肠道微生物区系、提高仔猪免疫力,并且作用效果优于单独使用酸化剂或抗生素。 相似文献
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复合有机酸和黄霉素对肉鸡生产性能及肠道微生态的影响 总被引:3,自引:0,他引:3
选180只1日龄艾维菌肉鸡,随机分为3个处理,每个处理6个重复,每个重复10只鸡,试验期42天,研究复合有机酸和黄霉素对肉鸡生产性能、养分利用率、胃肠道酸度和微生物的影响,比较复合有机酸与黄霉素作用效果。结果表明:①饲粮添加150mg/kg黄霉素使肉鸡0-21日龄日增重提高6.63%(P〈0.05);0.2%酸化剂使肉鸡22-42日龄日增重提高7.55%,料肉比降低3.96%;②酸化剂能显著提高22-42日龄肉鸡饲粮的钙磷利用率,而黄霉素有降低肉鸡22-42日龄饲粮钙磷利用率的趋势;⑧黄霉素和酸化剂能不同程度降低42日龄肉鸡盲肠内容物的pH值;添加酸化剂使肉鸡42日龄直肠大肠杆菌和乳酸杆菌分别显著增加12.10%和24.29%(P〈0.05)。本试验结果表明,复合有机酸在改善肉鸡生产性能和胃肠道微生态效果方面与抗生素相当。 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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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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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