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选用1200羽0日龄的克里莫肉鸭，依性别随机分为3组，每组设4个重复，每个重复100羽，公母各半，Ⅰ组为对照组，饲喂基础日粮，Ⅱ组和Ⅲ组为试验组，在基础日粮中分别添加0．10％的国外品牌PS酶和0．10％的国内品牌酶。试验结果表明：2种酶制剂可显著地提高肉鸭的日增重（P〈0．01），改善肉鸭的饲料转化率（P〈0．01），提高经济效益；肉鸭的增重和饲料转化率，试验组间没有显著差异（P〉0．05）。 相似文献
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不同水平发酵豆粕对肉鸡生产性能及营养素表观消化率的影响 总被引：2，自引：0，他引：2
将1日龄艾维茵肉仔鸡240羽,随机分成4个处理,每组6个重复,每个重复10只。对照组为玉米-豆粕型,试验Ⅰ、Ⅱ、Ⅲ组日粮中分别添加5％、10％、15％的发酵豆粕,共进行42d试验。结果表明：试验Ⅰ、Ⅱ、Ⅲ组与对照组比较日增重分别提高14.13％、14．55％、10．13％,差异均极显著（P〈0．01）;日采食量分别提高6．24％（P〈0．01）、4.81％（P〈0.01）、3．88％（P〉0．05）;料肉比分别下降7．03％、8．65％、5．94％,差异均极显著（P〈0．01）。试验Ⅱ与对照组比较粗蛋白的表观消化率提高12．20％（P〈0．05）,差异显著;试验Ⅰ、Ⅱ、Ⅲ组与对照组比较钙的表观消化率分别提高5.67％、10．12％、6．37％,但差异均不显著（P〉0．05）。有机物、总磷的表观消化率无差异。结论：本试验以添加10％的发酵豆粕为最佳。 相似文献
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利用人工合成大蒜索和大蒜干粉以适合比例分别为0．1％和0．2％添加于1日龄的肉仔鸡日粮中，观察其试验效果，结果显示：从试验全期看肉仔鸡的体重对照组明显优于两个实验组；全期来看试验组的平均日增重都明显低于对照组并且差异不显著（P〉0．05）；从全期的平均料重比来看，两个实验组都明显高于对照组并且表现为差异显著（P〈0.05）；粗蛋白和粗灰分及钙的利用率试验一组高于试验二组和对照组，并且与试验二组和对照组相比较表现为差异显著（P〈0．05）；粗脂肪和能量的利用率试验二组好于试验一组和对照组但差异不显著（P〉0．05）；粗纤维的利用率试验二组高于其它组别但差异不显著（P〉0．05）;磷的利用率对照组高于试验组并且与试验组相比表现为差异显著（P〈0．05）。 相似文献
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选择80只断奶新西兰白兔，按体重、性别均匀分为4组，对照组日粮中含未经发酵处理的花生秧粉35％，试验Ⅰ、Ⅱ、Ⅲ组分别在日粮中添加15％、25％、35％的发酵花生秧粉代替未经发酵的花生秧粉，测定30～70日龄阶段的日增重、耗料量和饲料转化率。结果显示：日粮添加发酵草粉能显著提高日增重和饲料转化率，试验Ⅰ、Ⅱ、Ⅲ组只均增重和日增重与对照组均存在显著差异（P〈0．05）或极显著差异（P〈0．01）；试验Ⅰ、Ⅱ、Ⅲ组的料重比与对照组均存在显著差异（P〈0．05）或极显著差异（P〈0．01），分别降低6．16％、7．84％、12．32％；试验Ⅰ、Ⅱ、Ⅲ组发病死亡率与对照组分别下降5％、10％和20％；试验Ⅰ、Ⅱ、Ⅲ组只均获利分别比对照组提高14．87％、23．56％、45．36％。 相似文献
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试验选用三黄鸡1800羽,随机分为3组,每组600羽,对照组采用基础日粮＋金霉素;试验一组采用基础日粮＋0．2％中草药添加剂;试验二组采用基础日粮＋0．1％益康素。经75d饲养试验,平均日增重,试验一组比对照组降低1．78％,试验二组比对照组降低2．51％,差异显著（P〈0．05）;料重比,试验一组比对照组提高1．09％（P〉0．05）,试验二组比对照组提高1．82％（P〈0．05）;腹泻率,试验一组比对照组增加30．77％（P〈0．01）,试验二组比对照组下降26．37％（P〈0．01）;死亡率,试验一组比对照组增加25．71％,试验二组比对照组增加45．71％。试验表明添加抗生素饲料添加剂有利于降低肉鸡死亡率,但不添加抗生索的饲料饲喂肉鸡肉质优良,市场销售价格提高20％～30％。 相似文献
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木聚糖酶在肉鸡小麦日粮中的应用效果 总被引：5，自引：0，他引：5
选用健壮、活泼、均匀1日龄艾维茵肉鸡360羽，饲养至22日龄时进行称重，保证组间个体均重差异不显著。随机分为3个处理（每处理3个重复，每个重复40羽），分别饲喂正对照组饲粮（玉米-豆粕型日粮）、负对照组饲粮（小麦型饲粮）、小麦型日粮添加100g／t木聚糖酶的饲粮。试验在第22-49日龄进行，为期28d。自由采食、饮水。计算平均日增重、料重比、成活率，并进行经济效益分析。试验结果，与正对照组相比，负对照组的日增重降低2．16％，料重比和日采食量没有变化，差异均不显著（P〉0．05）；试验组日增重分别比正、负对照组提高2．38％（P〉0．05）和4．65％（P〈0．05），料重比均下降6．91％（P〉0．05），成活率显著提高6．47％（P〈0．05）。试验组对于正对照组和负对照组的生物学综合评定值分别为105、5％、103．7％，均大于100％，这说明小麦加木聚糖酶日粮比玉米日粮、小麦日粮更能促进肉大鸡生长性能的发挥。与正对照组相比，负对照组的单位增重饲料成本降低了0．15元／kg，试验组单位增重饲料成本降低了0．49元／kg。 相似文献
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采集南岳衡山土壤中原始土著菌群进行分离培养，制成南岳山土著菌粉。通过加入发酵床和饲料中进行为期90d的饲养试验，与传统养猪在驱臭灭蝇、日增重、肠道疾病防治效果和生产性能进行对比试验。结果表明：试验组较对照组猪舍NH3和H2S气体含量极显著降低68．1％（P〈0．01）和54．7％（P〈0．01）、苍蝇极显著减少88．9％（P〈0．01）、肠道疾病发病率显著降低25％（P〈0．05）、头均日增重显著提高12．7％（P〈0．05）、饲料报酬率显著提高3．5％（P〈0．05）；在饲养期内试验猪肠道疾病很少发生、基本不用抗菌素药物。南岳山土著菌群能有效解决集约化养猪造成的环境污染、降低猪肠道疾病的发病率、提高猪生长性能。 相似文献
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谷氨酰胺对断奶仔猪免疫功能的影响 总被引：9，自引：0，他引：9
选取21日龄杜大长断奶仔猪60头，研究日粮中添加1％谷氨酰胺对断奶仔猪免疫功能的影响。断奶10日龄，对照组血清IgG、IgM水平比断奶前有降低趋势，试验组血清IgG、IgM水平无明显下降，对照组和试验组血清IgA水平比断奶前提高20．31％（P〉0．05）、28．13％（P〈0．05），试验组血清IgG和IgM水平分别比对照组高34．67％（P〈0．05）和32．58％（P〈0．05）。断奶20日龄，试验组血清IgA和IgM水平分别比对照组高15．22％（P〈0．05）和30．66％（P〈0．05）。T淋巴细胞增殖分化率分析结果显示，对照组和试验组增殖率分别为16．52％、28．92％，差异显著（P〈0．05）。试验组肠系膜淋巴结的DNA含量较对照组提高9．18％（P〈0．05）。断奶10日龄和断奶20日龄的对照组与试验组间C3、C4水平差异不显著。 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