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蛋氨酸螯合铁对断奶仔猪生产性能的影响 总被引：4，自引：0，他引：4
本试验选用36头35日龄体重7.7 kg左右的杜长大三元杂交商品代断奶仔猪,随机分为试验组和对照组,每组18头,公母各半.试验组饲料中添加0.04%的蛋氨酸铁螯合物,对照组饲料中不添加蛋氨酸铁螯合物.经过30 d的饲养试验,结果表明(1)试验组的日增重比对照组多增重77 g,提高了25.4%,差异极显著(P<0.01);试验组的平均采食量比对照组增加92 g,提高了19.5%;试验组的料重比比对照组降低4.5%.(2)经济效益显著试验组仔猪增重1 Kg获得的毛利润比对照组多0.12 元,试验期间每头小猪比对照组多盈利16.87元. 相似文献
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试验选取秦州区平南镇盛丰种养殖合作社内血缘关系清楚,同一胎次的15日龄体重、健康状况相近的新西兰仔兔为研究对象,在110 d内,采用分两个阶段饲喂两种饲料模式与传统“一料到底”的饲喂模式,对肉兔开展育肥增重及产肉性能等对比试验。分两个阶段饲喂两种饲料的为试验组,一料到底的为对照组。通过试验,试验组断奶重比对照组增加37.2 g,显著提高7.31%(P <0.05);2月龄试验组体重比对照组增加52 g,增加4.27%,差异不显著（P> 0.05）;3月龄试验组体重比对照组增加277 g,极显著增加20.43%(P <0.01);4月龄试验组体重比对照组增加253 g,极显著增加10.35%(P <0.01)。试验组平均日增重比对照组高4.48 g,极显著提高17.28%(P <0.01);试验组只均总耗料量比对照组少1657.89 g,极显著降低19.42%(P <0.01)。试验组2月龄体长和胸围与对照组差异不明显（P> 0.05）;3、4月龄体长和胸围均极显著高于对照组（P <0.01）。试验组半净膛率比对照组高8.86%,全净膛率比... 相似文献
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益生素对蛋鸡产蛋性能的研究 总被引：3，自引：0，他引：3
270只海兰蛋鸡,随机分为2组,设3个重复,试验组在基础日粮中添加0.2%的益生素,对照组不添加益生素,试验期56 d。试验结果表明,试验组和对照组的平均产蛋率分别为90.89%和87.33%;试验组较对照组高3.56%;试验期内平均每天耗料量:试验组为5.39±0.32(kg/处理组),对照组5.39±0.35(kg/处理组),差异不显著(P>0.05);产蛋数:试验组为40.89±3.62枚/只,对照组为39.3±7.13枚/只,差异极显著(P<0.01);蛋重:试验组为52.68±0.11 g/只.天,对照组为50.73±0.18 g/只.天,差异极显著(P>0.01);破软蛋率(%):试验组为29.2±0.29,对照组为47.02±0.38,试验组仅为对照组的62.34%,差异极显著(P<0.01);料蛋比:试验组每只鸡蛋料比为2.27∶1,对照组每只鸡蛋料比为2.36∶1,对照组比试验组多耗料4%。试验组比对照组每只鸡多获利润0.48元,增收效益明显。 相似文献
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采用蛋用型公雏育肥专用饲料与快大型肉鸡料进行对比饲养试验.结果表明,试验组0～54日龄平均日增重为16.34±0.28g,比对照组15.41±0.34g提高6.0%(P＜0.01);饲料报酬为2.62∶1,与对照组2.60∶1基本持平;经济效益:试验组为羽均毛利1.27元,比对照组0.79元增加0.48元,经济效益提高60.80%. 相似文献
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浅析酶制剂对断奶仔猪生产性能的影响 总被引：1，自引：0，他引：1
选取健康21日龄断奶长白仔猪544头,采取随机分组的办法分成2组,第1组为试验组271头,第2组为对照组273头.试验组21-49日齿、50-70日龄阶段在对照组基础上分别添加HF-1华芬酶750g/t、1311华芬酶850g/t。饲养管理条件相同.经过50d的试验，结果表明：试验组日增重比对照组提高5.14%经显著性检验，试验组与对照组差异显著（P〈0.05）。试验组存活率比对照组高1.46％腹泻率比对照组低18.23％饲料转化率提高12．18％，头平净增收入比对照组提高9.14％ 相似文献
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选择胎次相同、出生日龄和产仔数相近的撒坝杂交仔猪 4窝 ,共 4 2头 ,采用单因子对比试验设计随机分为 2组 ,每组 2窝 ,在试验组的仔猪日粮中添加动植物细胞赋活增进剂 ,测定仔猪 15日龄体重增加到 2 0kg时日增重、饲料转化率和发病率。结果表明 :仔猪平均日增重试验组2 82 g ,比对照组 2 4 6 g多 36 g ,提高 14 .6 % (P >0 .0 1) ;日采食量试验组 32 7g ,比对照组 4 2 1g低94g ,降低 2 8.4 7% (P >0 .0 1) ;试验组仔猪发病率 9.0 5 % ,比对照组 13.85 %降低 4 .8个百分点 相似文献
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用新配制的“9201”猪用复合饲料添加剂饲喂生长肉猪,120天的试验结果:日增重,试验组为543g,比对照组的358g 提高51.68%(P<0.01);每千克增重耗料量,试验组为3.54kg,比对照组的4.20kg 减少18.64%(P<0.05);每头猪盈利,试验组为121.31元,比对照组的67.64元增加79.35%,经济效益显著,很有推广价值。 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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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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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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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