共查询到20条相似文献，搜索用时 62 毫秒
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，第一组为试验组271头，第二组为对照组273头。试验组21-49日龄、50-70日龄阶段在对照组基础上分别添加HF-1华芬酶750克／吨、1311华芬酶850克／吨。饲养管理条件相同。经过50天试验，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
2.
试验选用日龄相近、体重为30kg左右的杜长大三元杂种仔猪120头，研究微生态制剂生态宝对肥育猪干物质表观消化率的影响。试验猪按栏分为3个处理，每个处理设4个重复，每个重复10头猪，试验期14d。对照组饲喂玉米-豆粕型基础饲粮，两个试验组分别在基础饲粮中添加生态宝1kg／t和2kg／t。结果表明，第1周取样时，添加生态宝2kg/组干物质表观消化率比对照组显著提高3．95％，生态宝1kg/t组干物质表观消化率比对照组提高1．64%；第2周添加生态宝1kg／t和2kg／t组干物质表观消化率均显著高于对照组，1kg／t组比对照组显著提高3．81％，2kg／t组比对照组显著提高3．92％，两试验组间差异不显著。结论，生态宝具有提高饲料干物质消化率的作用。 相似文献
3.
祁玉秀 《青海畜牧兽医杂志》2013,43(5)
本试验将32头断奶八眉猪三元仔猪随机分为2组,试验组日粮中添加0.1％的加酶益生素,对照组不添加加酶益生素,饲喂30d.结果试验组日增重586g,对照组日增重547g,经t检验差异显著,(P＜0.05)；试验组料肉比为1.74:1,比对照组降低6.95％,而且试验组的仔猪腹泻发病率比对照组降低18.75％,试验组仔猪比对照组多获利17.64元/头.(仔猪30元/kg). 相似文献
4.
用CH复合菌酶制剂对1-21日龄、21-53日龄肉仔鸡进行了试验，1-21日龄肉仔鸡成活率试验组比对照组提高43％，日增重试验组比对照组提高7.61％，每千克增重耗料试验组比对照组减少252％。21-53日龄肉仔鸡日增重试验组比对照组提高5．15％；每千克增重耗料试验组比对照组减少3.77％。 相似文献
5.
6.
为研究母猪分娩前后使用抗病营养素替代抗菌药物对母猪和仔猪健康的影响,选择健康状况良好、配种日期相近、2～7胎的长大二元杂种母猪80头,随机分为4组,每组20头。3个试验组分别从母猪妊娠90 d至仔猪21日龄断奶在基础母猪料中添加健力源300 g/t、50%黄芪多糖原粉100 g/t、黄芪预混剂300 g/t;对照组仅在母猪产前、产后各7 d饲料中添加林可-壮观霉素预混剂1 000 g/t,其它时间只饲喂基础母猪料。结果表明,与对照组相比,健力源组仔猪初生重与21日龄断奶重分别极显著提高0.185 kg、1.396 kg,腹泻率降低13.3个百分点,断奶成活率有提高的趋势;母猪没有发生子宫感染、乳房炎,产后食欲恢复也最好,断奶后7 d内正常发情率最高达95%,比对照组提高20个百分点。 相似文献
7.
《饲料工业》2015,(22)
试验旨在研究不同载体组合酶制剂对不同日龄断奶仔猪生长性能和经济效益的影响,并对其作用机理进行初步探讨。试验分别选用(36±1)日龄和(40±1)日龄断奶的三元杂交(杜×长×大)断奶仔猪进行试验。试验分3组,对照组饲喂基础日粮;试验组Ⅰ为普通载体组合酶组,在基础日粮的基础上添加普通载体组合酶500 g/t;试验组Ⅱ为发酵载体组合酶组,在基础日粮的基础上添加发酵载体组合酶500 g/t。试验期为19 d。试验结果表明:生长性能与对照组相比,(36±1)日龄,试验组Ⅰ和试验组Ⅱ在日增重方面分别比对照组提高了11.7%和21.0%,日采食量方面分别比对照组降低了13.8%和5.2%,料肉比方面分别比对照组降低了23.1%和22.1%;(40±1)日龄,试验组Ⅰ和试验组Ⅱ在日增重方面分别比对照组提高19.9%和20.3%,日采食量方面分别比对照组提高了1.3%和7.6%,料肉比方面分别比对照组降低了15.6%和10.8%。经济效益与对照组相比,(36±1)日龄试验组Ⅰ和试验组Ⅱ分别比对照组每头增加毛利12.35元和12.84元,(40±1)日龄试验组Ⅰ和试验组Ⅱ分别比对照组每头增加毛利12.58元和9.20元。不同载体组合酶对不同日龄断奶仔猪的影响方面,试验结果表明,发酵载体组合酶对断奶仔猪使用越早,经济效益越明显。 相似文献
8.
为研究日粮中添加复合微生态制剂对蛋种鸡小肠黏膜双糖酶活性的影响,试验选用1日龄海兰褐蛋种鸡320只,随机分为4个组,试验1、2、3组分别在空白对照组日粮基础上添加50 g/t、100 g/t、200 g/t的复合微生态制剂,分别测定21、42和112日龄蛋种鸡十二指肠、空肠和回肠黏膜中蔗糖酶、乳糖酶和麦芽糖酶的活性。结果显示:①在21和42日龄时,试验2组蛋种鸡十二指肠和空肠黏膜的蔗糖酶活性显著高于对照组(P<0.05);②21和42日龄时,试验组蛋种鸡十二指肠、空肠和回肠黏膜的乳糖酶活性显著高于对照组(P<0.05);③21日龄时,与对照组相比,试验2、3组蛋种鸡空肠黏膜的麦芽糖酶活性显著提高(P<0.05);④42和112日龄时,试验2组空肠黏膜的麦芽糖酶活性都高于对照组(P<0.05)。结果提示日粮中添加复合微生态制剂可提高蛋种鸡小肠黏膜双糖酶活性,在本试验条件下,100 g/t为最适的添加剂量。 相似文献
9.
《饲料工业》2015,(1)
为研究新型生物饲料添加剂群体感应N-乙酰基高丝氨酸内酯酶(淬灭素)对肉仔鸡生产性能的影响,采用单因素随机设计,选择健康、体重接近的肉仔鸡256只,随机分成2个处理,每个处理8个重复,每个重复16只,试验周期42 d。结果表明试验组肉鸡在1~21日龄饲喂淬灭素组肉仔鸡比对照组料肉比显著降低了0.05(P0.01);试验组肉鸡在22~42日龄添加淬灭素组比对照组料肉比降低了0.04;试验组肉鸡1~42日龄肉鸡日增重比对照组平均值提高2.23 g,日增重提高3.37%(P0.05),饲喂淬灭素组比对照组料肉比显著降低0.04(P0.05),1~42日龄肉鸡试验组饲料转化率提高2.30%。试验结果表明,在本试验条件下在肉鸡饲料中添加500 g/t N-乙酰基高丝氨酸内酯酶可以提高肉仔鸡饲料转化率和日增重。 相似文献
10.
11.
12.
13.
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
14.
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
15.
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
16.
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
17.
18.
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
19.
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