Microbiological method for assaying lincomycin in animal feed: collaborative study.     

A W Neff  R W Thomas 《Journal of the Association of Official Analytical Chemists》1978,61(5):1107-1112

A microbiological assay for determining lincomycin in swine feed, supplement, and a vitamin-mineral premix was studied collaboratively in 16 laboratories. The design of the study involved a complete feed, feed supplement, and a vitamin-mineral premix covering a range of fortification from 20 to 80 g/ton and 80 to 2600 g/ton. Two methods of sample preparation were used depending on the concentration of lincomycin in the sample. Statistical evaluation of the results from the 2 methods indicated that 10 and 11 collaborators, respectively, had mean recoveries which were not significantly different from one another. Ten laboratories obtained a mean recovery of 112.2% (range 102.3--123.5%) for the lower level, and 11 laboratories obtained a mean recovery of 104.4% (range 100.0--107.7%) for the higher level. The method has been adopted as official first action.  相似文献   

In Response to “Health Screening on Aconcagua”     

Matthew P. Lazio  Jon D. Van Roo  Sanjeev Malik  D. Mark Courtney  Carlos Pesce 《The Forestry Chronicle》2009,20(4):393-394

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Residual effects of fungicidal spray programmes on apple trees     

Robert J. W. Byrde  Christopher W. Harper  Margaret E. Holgate  Thomas Hunter 《Pest management science》1973,4(3):327-333

Spraying programmes for apple scab and mildew control sometimes had residual effects for one or even two years. Thus, benomyl (0.025% a.i.) and pyridinitril (0.035% a.i.) drastically reduced the subsequent incidence of cankers caused by Nectria galligena on young wood. Apple scab fruit infection, caused by Venturia inaequalis, was also less on trees on which benomyl had been used in the previous season. In the bark of such trees, toxic residues equivalent to 1 to 4 μg benomyl/g fresh wt. were detected by bioassay 7 months after spraying.  相似文献   

Wildebeest-derived malignant catarrhal fever: unusual epidemiology in South Africa     

B J Barnard  H E Van de Pypekamp 《The Onderstepoort journal of veterinary research》1988,55(1):69-71

The epidemiology of wildebeest-derived malignant catarrhal fever in South Africa differs from the worldwide accepted pattern. Here the occurrence of the disease is often not related to close contact between cattle and wildebeest, and most cases are observed during late winter and spring, when wildebeest calves are 8-10 months old. This is in contrast to the situation in Kenya and Tanzania, where most cases are encountered during autumn, when wildebeest calves are 3-4 months old.  相似文献   

Characterization and purification of the F17 adhesin on the surface of bovine enteropathogenic and septicemic Escherichia coli   总被引：13，自引：0，他引：13  

P F Lintermans  P Pohl  A Bertels  G Charlier  J Vandekerckhove  J Van Damme  J Schoup  C Schlicker  T Korhonen  H De Greve 《American journal of veterinary research》1988,49(11):1794-1799

The F17 antigen from bovine enterotoxigenic Escherichia coli strain (E coli 25KHO9), which adhered to calf intestinal villi, was isolated. An enterotoxin-negative derivative (25KHO9st) was used for further studies. Using an immunogold-labeling technique, the F17 antigen was characterized as a fimbrial protein. Pure fimbriae with a subunit molecular weight of 20,000 were obtained by homogenization and use of a sucrose gradient. The adhesion of E coli 25KHO9st was mediated by the F17 fimbriae, as both F17 antibodies and F17 protein blocked the adhesion of the strain 25KHO9st. The F17 fimbriae were serologically distinct from K88, K99, F41, and 987P fimbriae and did not agglutinate bovine, ovine, guinea pig, human, or chicken erythrocytes. Peptide fingerprint analysis revealed F17 and F(Y) adhesins to be homologous, if not identical.  相似文献   

Assessment of the reproductive system of the male ruminant.     

K A Bruner  S D Van Camp 《Veterinary Clinics of North America: Food Animal Practice》1992,8(2):331-345

Physical examination requires very little equipment or expense and is an effective means of obtaining valuable information concerning fertility. Thorough evaluation of the reproductive system provides important information often unattainable by any other means. Disease processes, congenital abnormalities, injuries, management errors, and many other factors can be identified. No segment of the examination should be overlooked, as each part is important. The time invested in evaluating the male reproductive system is rewarded with a more complete and accurate assessment of the breeding male.  相似文献   

Salinity in irrigation and water resources: Dan Yaron (editor). Marcel Dekker,New York, 1981. vii + 432 pp., CHF 160/US$80.00, ISBN 0-8247-6741-1     

Jan Van Schilfgaarde 《Agricultural Water Management》1982,5(3):277-280

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Intestinal permeability to macromolecules in piglets infected with transmissible gastroenteritis virus     

L. Vellenga  Th. Wensing  H. J. A. Egberts  J. E. Van Dijk  J. M. V. M. Mouwen  H. J. Breukink 《Veterinary research communications》1988,12(6):481-489

The permeability of the intestine of specific pathogen free piglets was investigated by measuring the concentration of 125-I in the blood after oral administration of 125-I polyvinylpyrrolidone (125-I PVP, MW=40 000 Da) and the concentration of 131-I in the faeces after intravenous administration of 131-I porcine albumin (131-I PA, MW=68 000 Da). The tests were performed one day before and up to two days after the piglets were infected with the Miller strain of transmissible gastroenteritis (TGE) virus. Biopsies of the jejunum were taken at the end of the experiment and blood samples were taken six-hourly. The piglets became anorexic and had diarrhoea 12 hours after infection; the packed cell volume decreased and the concentrations of urea and total serum proteins increased slightly after infection. However, the marked villous atrophy was not accompanied by an increased permeability of the intestine to PVP or PA.  相似文献   

Regulation of hepatic triacylglycerol synthesis and secretion     

H. P. Haagsman  L. M. G. Van Golde 《Veterinary research communications》1984,8(1):157-171

Triacylglycerols are the most concentrated storage form of energy for the mammalian organism. These lipids are synthesized and secreted by the liver and serve as a fuel for other tissues. This paper presents a brief review of the regulation of hepatic triacylglycerol synthesis and secretion. Particular attention will be given to the dissociation of the synthesis of triacylglycerols from that of the metabolically closely related nitrogenous phospholipids. Recent evidence is presented which suggests that triacylglycerol synthesis (and secretion) is regulated, at least partially, at the diacylglycerol branchpoint.  相似文献   

Ophthalmic lesions in locoweed poisoning of cattle, sheep, and horses     

K R Van Kampen  L F James 《American journal of veterinary research》1971,32(8):1293-1295

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