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选用21日龄的杜×长×大三元杂交早期断奶仔猪160头，按窝别、性别和体重分为2组，即对照组为基础日粮，试验组为基础日粮＋0．1％复合卵黄抗体粉剂。试验表明，21～35日龄阶段，试验组比对照组平均日增重高15g（P〈0．05），采食量高2．4g·d^-1（差异不显著），料重比下降，腹泻率下降9．9％（P〈0．05）。35-70日龄阶段，试验组比对照组平均日增重高6．5g（差异不显著），采食量下降15g·d^-1，料重比低，腹泻率下降1．5％（P〈0．01）。 相似文献
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β-甘露聚糖酶对断乳仔猪消化酶活性的影响 总被引：2，自引：0，他引：2
应琳琳 《养殖与饲料．饲料世界》2009,(4)
将72头健康的28±2日龄杜×长×大三元杂交断奶仔猪（体重平均为7．8±0．69kg）,按公母各半的原则随机分为4个处理组,其中1组为对照组,2、3、4组为试验组,每组3个重复,每个重复6头猪（公母各半,分头编号;各组基础日粮相同,营养水平一致）,1组（饲喂基础日粮）2组（饲喂基础日粮＋0．025％β－甘露聚糖酶）,3组（饲喂基础日粮＋O．05％β-甘露聚糖酶）,4组（饲喂基础日粮＋0．1％β-甘露聚糖酶）。实验结果表明：在饲料中添加一定量的β－甘露聚糖酶可以显著提高消化道胰蛋白酶和淀粉酶的活力（P〈0．05）,对脂肪酶的影响不显著。 相似文献
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本试验分别对发酵床猪舍和传统猪舍的H2S和NH3浓度进行测定。上午8时发酵床猪舍H2S（mg/m3）浓度为：保育舍（3．14＋0．32）、母猪舍（2．25±0．47）、育肥合（2．31±0．21）,NH3（mg/3）浓度为：保育舍（2．54±0．62）、母猪舍（4．61±0．94）、育肥舍（1．24±0．75）;传统猪舍H2S（mg/m3）浓度为：保育舍（5．42±1．63）、母猪舍（6．41±1．73）、育肥舍（7．92±1．46）,NH3（mg／m3）浓度为：保育舍（4．84±0．87）、母猪舍（7．42±1．15）、育肥舍（8．26±1．35）。试验结果表明,发酵床猪舍H2S和NH3浓度显著低于传统猪舍。 相似文献
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在农养舍饲和不改变基础日粮的条件下，肉兔日粮中添加硫酸钠育肥，试验Ⅰ组在基础日粮中添加0．1％，试验Ⅱ组添加0．2％，试验Ⅲ组添加0．3％，只饲喂基础日粮的作为对照组。结果表明：3个试验组日增重分别为27．1土3．4，28．4土2．7和26．2土2．8g，均明显（P＜0．05）高于日增重23．2±3．1g的对照组。但3个试验组间的差异不明显（P＞0．05），3个试验组的经济效益分别比对照组提高21.2％、29.7％和12．7％。以添加0．2％的试验Ⅱ组育肥效果最好，添加0．3％的试验Ⅲ组育肥效果较差，且随添加量的增加育肥效果趋于下降趋势。 相似文献
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选用3～4月龄的青海藏羊断奶羔羊20只,随机分为对照组和试验组两组。在基础日粮和饲养方式完全相同的情况下,在试验组日粮中添加硒0.15 mg/kg,铁60 mg/kg,对照组只饲喂基础日粮,进行45 d舍饲试验。结果表明,试验期对照组、试验组只均增重和平均日增重分别为4.02±0.68 kg、5.84±0.83 kg和93.34±15.18 g、129.78±18.50 g,试验组羊只的增重明显高于对照组(P<0.01)。在整个试验期间,试验组每只羊毛利润比对照组多13.12元,经济效益明显。 相似文献
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为进一步研究半胱胺盐酸盐（CSH）提高猪对日粮中营养物质消化、吸收和利用的效果，考察在氨基酸水平和其他营养指标相同，适当降低基础日粮代谢能水平（0．36MJ／kg）的情况下，添加CSH（含半胱胺盐酸盐≥30％）对生长猪生产性能的影响，选择日龄接近、健康且体质量一致，平均体质量（43．63±0．78）kg的60头杜×长×大生长猪，随机分为2个处理，每处理30头猪，阉公和母各半。对照组饲喂基础日粮，试验组饲喂代谢能降低约0．36MJ／kg的基础日粮＋700g／tCSH（强化保生灵），试验期45d。试验结果显示，试验组日增质量696g，与对照组（698g）一致（P=0．95），料重比2．71，比对照组（2．65）略高，综合日增质量和料重比等生产性能，可得出结论。在生长猪日粮中添加CSH，在保证生长猪生产性能的情况下，仅日粮的能量而言，相当于每吨节约10．2kg的大豆油，为节约能量饲料资源提供了有益的探索。 相似文献
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选用 2～ 3岁的高原型青藏羊 4 0只 ,随机分为 2组 ,每组 2 0只 ,对照组饲喂基础日粮 ,试验组在基础日粮中添加0 .2 %复合酶制剂。经 5 0d育肥的试验 ,结果表明 :对照组与试验组羊只均分别增重 6 .0 3kg、8.18kg ,2组差异显著 (P<0 .0 5 ) ;试验组较对照组只均多增重 2 .15kg ,只均每天可增收 0 .336元 ,投入产出比为 1∶3.73,经济效益显著。 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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本试验研究了奶牛日粮中添加葛根粉对奶牛生产性能的影响。选用产奶量、体重相近的健康中国荷斯坦奶牛60头,随机分成3组,每组20头。3组日粮分别是：对照组日粮为基础日粮、试验Ⅰ组目粮为基础日粮＋葛根粉200g/（头·d）,试验Ⅱ组日粮为基础日粮＋葛根粉300g/（头·d）。结果表明,日粮添加葛根粉200g／（头·d）试验组产奶量和乳成分与对照组无显著差异（P〉0．05）;日粮添加葛根粉300g/（头·d）试验组产奶量、4％标准乳产奶量比对照组显著增加（P〈0．05）,乳脂产量、乳蛋白产量比对照组有提高的趋势,但差异不显著（P〉0．05）。 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