外源物质对辣椒种子发芽的影响研究     

杨茹薇  巴合旦  秦勇  申耀荣 《种子》2012,31(6):100-102

用一定浓度的赤霉素(GA3)、生长素(IAA)、过氧化氢(H2O2)、硝酸钾(KNO3)、萘乙酸(NAA)溶液处理可显著提高辣椒砧木品种肩车种子的发芽率,并对其发芽势、发芽指数有一定的促进作用。比较几种药剂对辣椒种子发芽的影响发现,GA3和IAA对辣椒种子的发芽影响效果最佳,最适宜浓度分别为200 mg/L和1.5 mg/L。  相似文献   

铜、镉污染对小麦种子萌发及幼苗生长的影响   总被引：1，自引：0，他引：1  

吕笃康  巴音山  赵玉 《种子》2012,31(9):108-111

以小麦种子为试材,通过水培试验研究了铜、镉污染对小麦种子萌发及幼苗生长的影响。结果表明,在实验所选的胁迫浓度范围内,单一铜污染时,对小麦种子萌发初期有短暂的促进作用,小麦种子发芽率随着Cu2+浓度的升高,呈先升后降。在20 mg/L Cu2+处理时出现了毒性兴奋效应现象。铜、镉污染对小麦幼苗的苗长和根长的抑制作用较为显著。根据综合效应指标,铜、镉复合污染对小麦种子萌发的影响表现形式为铜、镉的协同作用。  相似文献   

冬枣树皮疱斑病防治药剂筛选试验     

常慧红  张路生  巴秀成 《辽宁林业科技》2012,(5):18-19,25

冬枣树皮疱斑病Phoma persicae是近年在冬枣上新发生的一种重要病害,2009～2011年对其开展了室内抑菌测定和田间防效试验。结果表明,室内抑菌效果较好的药剂为苯醚甲环唑、丙环唑、氟硅唑、苯醚甲环唑.丙环唑、恶唑菌酮.氟硅唑,抑菌率分别为98.7%、96.2%、94.9%、93.6%、92.3%;田间防治效果较好的药剂有苯醚甲环唑、嘧菌酯、氟硅唑、中生菌素,防治效果分别为90.2%、87.1%、80.4%、69.1%,可以在防治冬枣树皮疱斑病生产中推广使用。  相似文献   

用荷斯坦奶牛性控精液生产体内性控胚胎     

巴特尔  孙伟  苏和  郭继彤  李喜和 《动物医学进展》2012,33(4):68-71

采用荷斯坦奶牛X性控冻精和超数排卵技术结合生产奶牛性控胚胎,以建立高效、低成本的体内性控胚胎生产方法。研究发现,使用CIDR和Cue-Mate进行奶牛同期发情处理,发情率分别为90.9%和100%(P<0.05),且Cue-Mate的发情时间更加集中;加拿大的FOLLTROPIN-V和中国科学院动物研究所的FSH对奶牛超排效果影响不显著,分别为头均胚胎数10.08枚±8.08枚、头均可用胚胎数2.38枚±3.07枚和头均胚胎数6.57枚±4.31枚、头均可用胚胎数2.00枚±1.88枚,无显著差异(P>0.05);奶牛发情后12h～14h和16h～19h人工授精,分别获得头均胚胎数10.25枚±5.53枚、头均可用胚胎数5.33枚±4.52枚和头均胚胎数10.13枚±6.93枚、头均可用胚胎数5.88枚±6.26枚,无显著差异(P>0.05)。但是未受精胚胎数差异显著(27对7,P<0.05)。  相似文献   

济源市森林城市景观格局分析     

丁晋利  尚慧昌  巴明廷  张开广 《湖南林业科技》2013,(1):61-64

以济源市2007年森林资源调查数据和2008年绿化数据以及卫星遥感图、城市绿地现状图等相关信息作为数据源,选取多样性指数、景观均匀度指数、城市绿地破碎度指数等3个景观生态格局评价指标,对济源市城区森林和市域森林景观格局进行了分析。结果表明：济源市城区森林绿地景观的均匀度指数较低,景观多样性整体程度有待进一步提高;市域森林景观格局分布不均匀,少数森林景观类型控制着整个景观格局。  相似文献   

Prevalence of campylobacter in pigs during fattening; an epidemiological study     

M.J.B.M. Weljtens  P.G.H. Bijker  J. Van der Plas  H.A.P. Urlings  M.H. Biesheuvel 《The Veterinary quarterly》2013,33(4):138-143

Summary

Numerous epidemiological reports implicate foods of animal origin as vehicles of human campylobacteriosis. Pigs are probably an important reservoir of campylobacter and a potential source of human infection. In order to improve our knowledge of the epidemiology of campylobacter in pigs, the prevalence of campylobacter and its contamination of feed were monitored in eight pig farms. Faeces samples of pigs aged 11 and 22 weeks, and samples of rectal, ileal and gastric content at a slaughterhouse were collected for bacteriological examination. On 5 farms, subsequent groups of pigs housed in the same stalls was sampled, too. A selection of the campylobacter isolates was characterized with a genetic typing method (RFLP). More than 85% of the sampled porkers were shown to be intestinal carriers of campylobacter at all stages of fattening. Subsequent groups of pigs housed in the same stalls were all carriers, too. The level of campylobacters in the faeces tended to decrease as the pigs got older. There was no difference in the frequency and level of infection with campylobacter between porkers on different farms. The feeding system (wet feed versus dry pellets) did not seem to influence the prevalence of campylobacter although wet feed gave lower counts of Enterobacteriaceae in the faeces.

RFLP‐typing showed a high diversity of campylobacter strains at each sampling on the farm. Similarities were seen between strains isolated during two subsequent samplings of the same group of pigs, but not between strains isolated on the same farm from subsequent groups of pigs housed in the same stall. This suggests that the piglets were already infected at a young age on the breeding farm.  相似文献   

Microbial and nutritional aspects of feeding fermented feed (poultry by‐products) to pigs     

H.A.P. Urlings  A.J. Mug  A.Th. van ‘t Klooster  P.G.H. Bijker  J.G. van Logtestijn  L.G.M. van Gils 《The Veterinary quarterly》2013,33(4):146-151

Summary

Broiler by‐products (heads, feet, and viscera) mixed with 4% dextrose were pasteurized for 4 min at 90°C core temperature, cooled to 20°C, and fermented with Lactobacillus plantarum as starter culture. These fermented poultry by‐products were fed to 12 individually housed fattening pigs as part (17.6% of the dry matter) of their fattening ration, the remainder composed of compound pig feed. Control pigs received a compound pig feed only. Both groups of pigs were fed restrictively on the basis of body weight. The technical results of the pigs fed the experimental diet showed a significantly improved feed:gain ratio (2.46 vs 2.57), a significantly higher carcass weight (86.1 vs 81.8 kg), a lower meat percentage (50.9 vs 52.5%) and an increased backfat thickness (21.5 vs 18.7%). The bacterial flora in the intestinal tract of the pigs fed the experimental diet differed significantly from the control animals. Decreased colony counts of mesophilic aerobic bacteria, Enterobacteriaceae, enterococci and lactobacilli were found in the rectal content and the prevalence of salmonella was lower.

It is suggested that the improved feed:gain ratio and the reduced bacterial activity of the measured groups of bacteria is a result of 1) the higher energy content of the diet, and(or) 2) an assumed enhanced digestibility of nutritional components in the diet, and(or) 3) the lower incidence of diarrhea in the pigs fed with fermented poultry by‐products. This resulted in a lower contamination level of enteropathogenic bacteria like, salmonella and Escherichia coli, in the gastro‐intestinal tract of the pigs fed fermented poultry by‐products.  相似文献   

Eruption of first permanent incisors and live weight gain in grazing yearling Angora goats     

BA McGregor  KL Butler 《Australian veterinary journal》2013,91(5):179-184

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Population dynamics of feral horses (Equus caballus) following above‐average rainfall in a semi‐arid environment of Australia     

S Kampmann  BA Hampson  CC Pollitt 《Australian veterinary journal》2013,91(11):482-487

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浅析阿拉善左旗林业有害生物防治现状及应对措施   总被引：1，自引：0，他引：1  

姚艳芳  杨芹  巴依尔  王晓勤  常桂霞  郝淑香  达来夫 《内蒙古林业调查设计》2019,(4):54-56

文章对阿拉善左旗林业有害生物防治现状进行了调查,分析了林业有害生物监测防治工作存在的问题,提出做好林业有害生物防治社会化服务工作应对的措施,对于建立起适应当前林业改革和发展形势需要的林业有害生物防治公共服务保障体系提供了理论依据。  相似文献