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1.
草坪草生长的抑制与解抑研究   总被引:32,自引:2,他引:30  
喷施600ppmMET能有效抑制草坪生长,促进分蘖,提高植株Fe、Mg、Zn、Cu、N、P和叶绿素含量,增强抗逆性,喷施30ppmGA_3能逆转MET抑制作用。  相似文献   

2.
肉鸡大肠杆菌病药物治疗比较试验   总被引:3,自引:0,他引:3  
选用氟哌酸(FPA)、氯霉素(CMT)、强力霉素(DOC)、庆大霉素(GEN)、卡那霉素(KAN)、呋喃唑酮(FUR)、磺胺甲基异恶唑(SMZ)等7种药物,对肉鸡大肠杆菌病进行分组治疗,试验鸡数5700只,分19组。试验结果表明:肉鸡大肠杆菌病的临诊治疗效果与药敏试验结果基本一致;内服用药的疗效与其吸收性相关;FPA、CMT、DOC的适宜治疗剂量分别为50ppm、750ppm、75ppm。  相似文献   

3.
研究了日粮中添加l-肉碱对日本鳗鲡生长性能的影响。添加浓度为200ppm,400ppm的试验组较不添加肉碱的对照组对绝对体增重分别增加了68%和28%;饲料增重比分别降低8%和10%,肉碱浓度为200ppm的日粮较400ppm的具有更好的生长性能。  相似文献   

4.
雏鸡实验性锰缺乏症及高磷对缺锰影响的病理学研究   总被引:1,自引:1,他引:0  
150只1日龄艾维茵(Avia)肉鸡随机分为5组,各喂以低Mn(基础日粮含锰15.7ppm),低Mn高P1(基础日粮+P0.15%),低Mn高P2(基础日粮+P0.45%)、补锰高P1(基础日粮+Mn100ppm+P0.15%)和补Mn(基础日粮+Mn100ppm)日粮,饲喂4周。低锰,低锰高P1、低锰高P2组第1周开始发病,第二周达高峰。发病症状为共济失调,跛行。单腿发病,病腿向外前侧伸展,严重  相似文献   

5.
钼是动植物必需的微量元素之一。钼在地壳中的平均丰度为 2 .3ppm ,土壤中钼含量常变动在 0 .2~ 5ppm ,平均为 2ppm ,大多数植物中钼含量在 1~ 1 0ppm ,钼在动物体内含量为每公斤体重约 1~ 4mg。钼在植物氮素正常同化作用中是必需的元素之一 ,Mo—醛氧化酶、黄质氧化酶、固氮酶和硝基还原酶中都含有钼。这 4种酶中钼具有相似的催化作用 ,钼能改变硝酸还原酶的活性促进植物氮代谢 ,植物中的钼蛋白就是固氮酶 ,固定N2Mo酶—→ NH3,然后被植物同化。土壤缺钼会严重影响植物生长 ,植物缺钼时 ,抗坏血酸浓度显著减少 ,是…  相似文献   

6.
许友明 《饲料工业》1996,17(8):42-43
高效安全的饲料防霉剂浙江省安吉县酒厂许友明富马酸二甲酯(简称DMF)是抗真菌活性极强的饲料防霉剂。对黄曲霉的完全抑制最低浓度为600ppm(MIC值),对多种细菌的完全抑制最低浓度为800ppm以下(MIC值)。实践证明,DMF的高效广谱防霉效果是其...  相似文献   

7.
喹烯酮对肉用仔鸡的增重试验   总被引:10,自引:0,他引:10  
在饲料中分别添加25ppm、50ppm及75ppm三个剂量的“喹烯酮”与“喹乙醇”对肉用仔鸡进行了饲喂试验。结果表明,50ppm、75ppm剂量均能明显促进肉用仔鸡生长发育,其中以75ppm剂量最佳。与空白对照组相比“喹烯酮”增重率为121.99%,“喹乙醇”增重率为118.14%,“喹烯酮”的增重率稍高于“喹乙醇”,证明“喹烯酮”确有明显的促生长作用。通过临床扩大试验,选取75ppm添加剂量的“喹烯酮”进行了9批试验,与空白对照组相比,平均增重率为117%;减少死亡率5.42%;提高饲料利用率12%以上。  相似文献   

8.
“EM”是日本琉球大学比嘉照夫教授等研制出来的新型复合微生物菌剂,已在农作物栽培和环境保护上应用,取得明显效果。“EM”溶液中含有80多种有益微生物,饲喂“EM”,可明显增强猪免疫力和抗病性,加速猪生长,皮毛日渐光泽,猪生长整齐,粪便无臭味。本试验在于验证“EM”在养猪业上的应用效果与应用技术,为推广“EM”技术提供依据,现将试验结果简报如下:1试验与方法1.1猪群选择选择产龄相同的四头南昌白母猪,所产的仔猪出生日龄相同的四窝奶猪供试,随机分成EM组和对照(CK)组。1.2预试及正试期奶猪生后3…  相似文献   

9.
EM活菌剂由光合细菌、乳酸菌和放线菌等10属80多种微生物培养而成的有效微生物群。它们相互组合在一起,形成一个复杂的微生物生态系统。这个系统犹如一个微生物加工厂,各种微生物在其生长过程中产生出的有用物质及其分泌物质,或为各自或相互生长的基质或原料,从而形成相互间的共生增殖关系,显示出显著的经济生态效益和社会效益。EM在养殖业中的作用主要表现在:1 促进生长增加体重用EM活菌剂发酵饲料,一方面经EM微生物群的发酵有效地提高饲料中粗蛋白、氨基酸、维生素等营养物质的含量,大大降解纤维素、木质素等,提高…  相似文献   

10.
桔皮提取物有效成分治疗羊疥癣病的研究   总被引:6,自引:2,他引:4  
利用以提取物有效成分及其总成分进行了离体杀螨,局部涂擦和药浴试验,并与目前国内外认为效果较好的进口杀螨药-螨净作了比较。结果桔皮提取物有效成分浓度在100ppm,总成分在200ppm,螨净在250ppm,螨净为250ppm时,治愈率均为100%(以涂擦点数计算);用100ppm的有效成分,200ppm的总成分,250ppm的螨净(为厂定的药浴工作浓度)共对89只疥癣病羊进行了药浴试验,治愈率依次为  相似文献   

11.
克氏原螯虾人工诱导繁殖的初步研究   总被引:3,自引:0,他引:3  
为提高克氏原螯虾育苗过程中亲虾的成活率,利用福尔马林、高锰酸钾、食盐、聚维酮碘和溴氯海因对购进的亲虾进行消毒试验,结果表明:经上述5种常用药物浸泡消毒后,亲虾成活率分别比对照组提高25%、40%、5%、10%和15%,对亲虾采用高锰酸钾消毒效果较好;为提高克氏原螯虾亲虾的抱卵率,采用盐水诱导、雌虾去单侧眼柄诱导、盐水诱导+雌虾去眼柄双重诱导3种不同人工诱导方式诱导亲虾,促使其性腺发育,试验结果显示,经3种诱导方式诱导的亲虾抱卵率分别比对照组提高20%、31%和39%,双重诱导的平均产卵率高于单因子诱导。  相似文献   

12.
The effect of light quality on the maturation, condition and growth of the penaeid prawn Penaeus indicus was tested by comparing dim green and blue illumination against that of diffuse natural light as a control. Initially growth and condition were depressed in all three tanks and this could be regarded as a ‘settling down’ period, while spawning activity decreased in the blue and green tanks, but increased in the control tank. After three to five months the growth slopes became positive under green and blue light and condition improved, though the spawning levels still remained low (consolidation phase). Spawning and condition then continued to improve with time. It appeared that once growth and condition had normalized under blue and green light, spawning activity resumed. In the control, however, both prawn condition and subsequent spawning activity declined steadily after the end of the second month and this could be explained as a final reproductive effort with decreasing condition until the condition was too low for effective spawning. Growth and maturation in P. indicus can thus occur simultaneously without adversely affecting prawn condition provided that both a good diet and good quality light are supplied.  相似文献   

13.
Groups of eight rainbow trout (Salmo gairdneri) were fed rations containing 0 ppm, 1 ppm, 10 ppm and 100 ppm of the polychlorinated biphenyl, Aroclor 1254, over a period of up to 330 days. Growth rates were unaffected by these levels. Pathological changes were found in the kidneys of 13 fish on the polychlorinated biphenyl ration. Foci of nephrosis with cellular or granular cast formation were seen. The greatest number of cases occured in fish at the 10 ppm concentration. An increase in the number of hepatocytes per unit area was related to the greater concentration of polychlorinated biphenyls in the diet. A reduction in the amount of white pulp in the spleen was observed in 23 of 27 fish on the 10 ppm and 100 ppm diets. The fish with nephrosis had reduced splenic white pulp and lowered white cell counts. Fish fed the 1 ppm and 10 ppm levels had mean tissue residues of 1.4 and 2.3 ppm polychlorinated biphenyl respectively. Fish on the 100 ppm ration had a mean value of 80.1 ppm polychlorinated biphenyl content.  相似文献   

14.
Determination and kinetics of enrofloxacin and ciprofloxacin in Tra catfish (Pangasianodon hypophthalmus) and giant freshwater prawn (Macrobrachium rosenbergii) using a liquid chromatography/mass spectrometry method. J. vet. Pharmacol. Therap. 34, 142-152. The fluoroquinolones enrofloxacin (EF) and ciprofloxacin (CF) residues were investigated in the edible tissues of two important Asian aquacultured species such as Tra catfish (Pangasianodon hypophthalmus) and giant freshwater prawn (Macrobrachium rosenbergii) using a sensitive liquid chromatography-electrospray ionization-tandem mass spectrometry method. Fish and prawn were treated with medicated feed with multiple doses of EF, in field conditions. A validation study of the analytical method was realized in terms of linearity, specificity, precision (repeatability and within-laboratory reproducibility), recovery and decision limit (CCα). The time needed before the antibiotic disappears from animal tissues or reach the maximum residue limit (MRL, 100μg/kg) was assessed. The concentration values of EF detected in Tra catfish tissue were between the MRL and 2×MRL concentrations, according to the fish density, 7days following the end of the enrofloxacin treatment (20mg/kg body weight per day, for seven consecutive days). The concentration value of ER in prawn tissue was lower than the MRL and the limit of quantification (LOQ, 14μg/kg) 5 and 7days after the stop of the EF treatment (50mg/kg body weight per day, for five consecutive days), respectively. The mean detected levels of CF was much lower in comparison with that of EF, indicating that only a small part of EF is metabolized into CF (<5%) in both Tra catfish and prawn.  相似文献   

15.
天祝高寒地区栽培饲用芜菁光合日变化的初步研究   总被引:2,自引:2,他引:0  
对天祝高寒地区芜菁品种—洋芜菁和平芜菁在叶丛迅速生长期进行了光合日动态研究,结果表明:叶片周围微环境的相对湿度和光合有效辐射对叶片净光合速率影响较大,其作用强于其他与光合有关的生态因子;当叶片微环境相对湿度低于55%时,植物光合速率为0;当光合有效辐射和温度分别达到1409μE/m2和23.4℃时,日最大光合速率为13.2CO2mg/(dm2.h)。在叶丛迅速生长期,平芜菁比洋芜菁在干旱生境中有较强的适应性;地膜覆盖对芜菁单叶的光合速率影响不明显(P>0.05)。  相似文献   

16.
为研究饲粮中添加茶多酚(TP)和有效微生物(EM)对育成期水貂粪便污染物排放量的影响,试验选取400只育成前期水貂共160笼,随机分成8组,每组20个重复。采用两因素试验设计,共8个处理组,基础饲粮中分别添加0 EM+0 TP、0 EM+0.05%TP、0 EM+0.1%TP、0 EM+0.2%TP、200 mg/kg EM+0 TP、200 mg/kg EM+0.05%TP、200 mg/kg EM+0.1%TP、200 mg/kg EM+0.2%TP。预试期1周,正试期8周(前4周为试验I期,后4周为试验Ⅱ期)。结果表明:饲粮添加TP不能减少水貂粪便NH3、H2S和CO2生成量;饲粮添加200 mg/kg EM对水貂粪便NH3(48 h)、H2S(72 h和96 h)生成量有显著影响(P0.05);饲粮添加0.1%及0.2%TP可显著降低试验Ⅱ期粪便中氨氮含量(P0.05),饲粮添加200 mg/kg EM可降低粪便中总氮(试验I期)、总磷(试验I和Ⅱ期)、氨氮和亚硝酸盐氮(试验Ⅱ期)含量(P0.05)。由此可见,饲粮添加EM可以减少水貂粪便恶臭气体生成以及粪便污染物的含量,建议水貂饲粮中添加200 mg/kg EM。  相似文献   

17.
对产后母猪和断奶仔猪饲喂有效微生物菌群(EM),研究其对仔猪生产性能的影响。从产前7d开始给母猪基础饲料中添加5mL/kg的EM菌液,选产仔数不少于8头的3头母猪及其仔猪连续饲喂EM菌28d,仔猪进行断奶,统计母猪的增重、仔猪初生重、断奶重,仔猪成活率等,分析添加EM菌后对母猪生产性能的影响。在这24头断奶仔猪饲料中添加EM菌的饲料,饲喂至60日龄,统计仔猪的增重、采食量、料重比、发病数等,分析EM菌断奶仔猪生产性能的影响。另外选取3头同品种、同批次生产、产仔数相同的母猪及其仔猪饲料中不添加EM菌作为对照。结果表明,母猪产后日均采食量较对照组提高12.07%,仔猪的初生重较对照组提高15.90%,产活仔数提高了12.09%,断奶重增加9.09%,断奶头数增多20.99%,断奶成活率提高8.81%。断奶后仔猪试验组的平均采食量较对照组提高10.26%,料重比降低了7.14%,发病率下降了50.03%。说明EM菌对母猪和仔猪的生产性能均有提高作用,研究结果为EM菌在生猪养殖中的应用提供了基础资料。  相似文献   

18.
This experiment was conducted to evaluate the effects of different levels of sweet orange (Citrus sinensis) peel extract (SOPE) on humoral immune system responses in broiler chickens. Three hundred 1‐day broilers (Ross‐308) were randomly allocated to treatments varying in supplemental SOPE added in the drinking water. The experimental groups consisted of three treatments fed for 42 days as follows: a control treatment without feed extract, a treatment containing 1000 ppm of SOPE and a treatment containing 1250 ppm of SOPE. All treatments were isocaloric and isonitrogenous. Broilers were vaccinated with Newcastle disease virus (NDV), avian influenza (AI), infectious bursal disease (IBD) and infectious bronchitis virus (IBV) vaccines. Antibody titer response to sheep red blood cells (SRBC) was higher in the group fed 1250 ppm of SOPE (P < 0.05) as well as for immunoglobulin G (IgG) and IgM. Similarly, antibody titer responses to all vaccines were constantly elevated (P < 0.05) by SOPE enrichment in a dose‐dependent manner. Relative weights of spleen and bursa of Fabricius were unaffected by treatments. Dietary SOPE supplementation may improve the immune response and diseases resistance, indicating that it can constitute a useful additive in broiler feeding. Thus, supplying SOPE in rations may help to improve relative immune response in broiler chickens.  相似文献   

19.
Laying hens and roosters were given rations containing 0, 5 or 50 ppm of polychlorinated biphenyls (PCB) as Aroclor 1254 for up to 39 weeks. Due to drastic decline in production and hatchability of fertile eggs, the 50 ppm treatment was replaced with control ration at 14 weeks and the residual effects were investigated. Following the withdrawal of PCB from the ration, the affected parameters slowly returned to the control range. The 5ppm level of PCB reduced egg production but not hatchability of fertile eggs. Fertility for the 5ppm PCB group in the first 14 weeks was similar to the other groups but showed a significantly greater decline in the last 14 weeks.

Concentration of PCB in eggs of both treatment groups increased until maximum concentrations were reached. These maxima persisted until the end of the experiment or until the withdrawal of PCB from the ration. Following withdrawal of higher level of PCB, the PCB declined in concentration but persisted in eggs over a five month period.

  相似文献   

20.
Goats naturally infested with Damalinia caprae lice were used to evaluate the efficacy of flumethrin pour-on. The maximum load of lice infestation was detected in the neck region. The LC50 value of flumethrin pour-on against D. caprae was found to be 119.35 ppm and the 95% confidence limits were calculated to be 104.10 and 136.85 ppm. Flumethrin at the rate of 1 mg/kg body weight by pour-on application along the mid-dorsal line was found to be 100% effective in treating lice-infested goats compared with the control goats. The residual action of flumethrin was found to be at least 42 days during which period no apparent signs of any local or general adverse effects were observed. Based on these studies, it is suggested that flumethrin pour-on may be successfully used for both the prophylaxis and treatment of D. caprae infestation in goats and it is necessary to repeat the treatment after 42 days. The method of application is highly advantageous as it can be conveniently applied, even in animals with thick hair coat and during the winter months.  相似文献   

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