Epizootiology of fowls adenoviruses     

Hess M  Prusas C  Bergmann V  Mazaheri A  Raue R 《Berliner und Münchener tier?rztliche Wochenschrift》2000,113(5):202-208

Fowl adenoviruses of the serotype 4 from Germany were characterised by restriction enzyme analysis in comparison to isolates from Asia, South America and the FAV4 reference strain KR5. Only strain Da60 which was isolated from a psittacine aviary was identical with the reference strain KR5. None of the isolates was identical with the highly pathogenic strains from India and Ecuador. One-day-old chicks were infected orally and intramuscularly with the reference strain KR5, the psittacine isolate Da60 and isolate K1013 from Ecuador. Whereas no mortality was seen with the two strains KR5 and Da60, the mortality with K1013 was 100%. The main pathological signs were a swollen liver with necrosis and a lymphocyte depletion with a loss of the follicle structure. To investigate a second subject of avian adenovirus epizootiology several FAVs were characterized serologically and with PCR which was combined with the digestion of the PCR products. Including the reference strains, both methods were compared. It was shown that the digestion of the PCR products allows a clear attribution to a specific serotype, which underlines the usefulness of this method for diagnostic purposes.  相似文献   

Influence of Extreme Management on Decomposable Soil Organic Matter Pool     

Elke Schulz 《Archives of Agronomy and Soil Science》2013,59(2):101-105

Basing on two long-term model experiments (microplots as well as greenhouse pot experiment) the influence of extreme management on a very easily decomposable pool of soil organic matter (SOM) was measured. The carbon content (C hwe ) of a hot water extractable pool of SOM was used as an indicator for the decomposable C pool. This parameter reflects both the dynamics of the amount of decomposable organic C pool and the different transformation conditions in case of the pot experiment (outside versus inside the greenhouse). Depending on soil type and both the total and decomposable organic matter level at the starting point of the experiments we can observe differences in the decreasing speed of the decomposable C pool: in the soils having a high level of SOM at starting point C hwe pool decreases more rapidly compared to the soils unfertilized or in case of the only P and K treatment of the Static Fertilization Experiment at the beginning of the pot experiment. At least we can observe a difference in decreasing intensity of this C hwe pool when comparing different soil types.  相似文献   

The pathomorphology and pathogenesis of acute cardiovascular failure in swine. 2. Histopathologic findings in the myocardium of swine of different populations     

A Gr?fe  V Bergmann  H Seifert 《Archiv fuer experimentelle veterinaermedizin》1990,44(4):513-520

Histopathological alterations of the myocardium (inflammatory processes, fibrolysis, fibronecrosis, dystrophic calcification, fatty degeneration of fibres, sarcosporidia) were recorded for quantitative evaluation from 200 hearts which had been collected from clinically intact pigs for slaughter of different populations (Leicoma, land race, Schwerfurt breed, Belgian land race). Both incidence and severity of myocardial damage in pigs of stress-sensitive populations were higher with significance than those in the less stress-sensitive Leicoma population oriented to breeding. The highest rate of pathological processes was recorded from hearts of the Schwerfurt breed. These alterations were interpreted as objectively measurable expressions of breed-dependent differences in cardiovascular stability. In this context, rates of damage were higher in hearts of low absolute mass.  相似文献   

Establishment and early growth characteristics of six Paulownia genotypes for goat browse in Raleigh, NC, USA     

J. Paul Mueller  Jean-Marie Luginbuhl  Ben A. Bergmann 《Agroforestry Systems》2001,52(1):63-72

Meat goat production in the eastern USA is increasing as a result of growing demand from various ethnic groups. Because goats naturally prefer a high proportion of browse in their diets, research was initiated to investigate various silvopastoral production systems. The genus Paulownia contains several species which exhibit rapid juvenile growth and other characteristics that justify research into their potential use in meat goat feeding systems. In May 1997, six Paulownia genotypes were planted in a randomized complete block experiment with six replications. Trees were between 6 and 12 cm in height at planting. Genotypes included: P. fortunei seedlings, P. tomentosa seedlings, P. elongata seedlings and three P. elongata clones. Each 4-m wide plot contained a single row of 12 trees with an intra-row spacing of 1 m. Plant measurements included height, root collar diameter (RCD) at 3 cm above soil surface, and the number of main branches. Leaf samples were collected from all six replications for estimates of herbage quality. During 1998, trees were browsed with goats on two occasions to assess palatability of the herbage and to determine any preference for specific genotypes by the animals. Compared with seedling trees of all three species, the three P. elongata clones were taller (clones: 79.7 cm, seedlings: 55.9 cm; P < 0.01), had larger RCDs (clones: 18.4 mm, seedlings: 13.9 mm; P < 0.01) and had a higher branching frequency (clones: 4.9, seedlings: 1.5; P < 0.01) by the end of the first growing season. Mortality averaged 4.8% across all treatments and ranged between 0 and 8%. Early in the 1998 growing season before trees were browsed, P. elongata clones grew more rapidly than seedlings (clones: 116.4 cm, seedlings: 84.1 cm; P < 0.01). Estimates of herbage quality indicated favorable concentrations of energy and protein for lamina. In vitro true dry matter disappearance ranged from 85.4 (blades) to 71.5% (petioles) and crude protein from 25.1 (blades) to 4.9% (petioles). Animals readily browsed the lamina during two separate sessions, but no clear preference trends were observed among the different Paulownia genotypes.This revised version was published online in November 2005 with corrections to the Cover Date.  相似文献   

Fruit availability influences the seasonal abundance of invasive stink bugs in ornamental tree nurseries     

Holly M. Martinson  P. Dilip Venugopal  Erik J. Bergmann  Paula M. Shrewsbury  Michael J. Raupp 《Journal of pest science》2015,88(3):461-468

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Determination of cocoa butter equivalents in milk chocolate by triacylglycerol profiling     

Buchgraber M  Androni S  Anklam E 《Journal of agricultural and food chemistry》2007,55(9):3284-3291

An analytical approach for the detection and quantification of cocoa butter equivalents (CBEs) in milk chocolate is presented. It is based on (i) a comprehensive standardized database covering the triacylglycerol composition of a wide range of authentic milk fat (n=310), cocoa butter (n=75), and CBE (n=74) samples and 947 gravimetrically prepared mixtures thereof, (ii) the availability of a certified cocoa butter reference material (IRMM-801) for calibration, (iii) an evaluation algorithm, which allows a reliable quantification of the milk fat content in chocolate fats using a simple linear regression model, (iv) a subsequent correction of triacylglycerols deriving from milk fat, (v) mathematical expressions to detect the presence of CBEs in milk chocolate, and (vi) a multivariate statistical formula to quantify the amount of CBEs in milk chocolate. The detection limit was 1% CBE in chocolate fat (0.3% CBE in milk chocolate, having a fat content of 30%). For quantification, the average error for prediction was 1.2% CBE in chocolate fat, corresponding to 0.4% in milk chocolate (fat content, 30%).  相似文献   

Age‐dependent baseline values of faecal cortisol metabolites in the American mink (Neovison vison) under semi‐natural housing conditions     

E. Rauch  S. Bergmann  A. Hagn  J. Meixensperger  S. Reese  R. Palme  M.H. Erhard 《Journal of animal physiology and animal nutrition》2014,98(3):497-503

The welfare of an animal is ensured if it is able to fully satisfy its essential species‐typical needs in all functional aspects of behaviour. In mink, stereotypies and apathy, internal and/or external injuries as well as increased susceptibility to disease have been known to occur as a result of chronic stress. The non‐invasive method of analysing faecal cortisol metabolites (FCM) allows conclusions to be drawn about the stress level in the respective housing system. The objective of this study is to find out how the cortisol metabolites content in the faecal changes with increasing age of the mink under semi‐natural housing conditions. Thus, 40 American mink (Neovison vison) were housed in two outdoor enclosures imitating natural conditions. Throughout the entire study (13th to 32nd week of life), faecal samples were collected to measure cortisol metabolites. No differences in FCM concentrations between the two outdoor enclosures were found. In the young mink lower, less fluctuating FCM levels were found than in older animals. After the first faecal collection in the 13th/14th week of life, the level of metabolites decreased slightly (p = 0.032; 17th/18th week). From the 22nd/23rd week onwards until the 30th/31st week, shortly before the animals were pelted, continuously increasing concentrations were then measured. Increasing FCM levels with advancing age of the animals are probably attributable to the onset of sexual maturity and/or the respective season. This has to be taken into account in future studies using this method for assessing welfare and when comparing different mink housing systems.  相似文献   

Über den Einfluß der Eisen- und Manganernährung auf die Peroxidase- und Katalaseaktivität sowie den Gehalt an löslichen Kohlenhydraten in den Blättern einiger landwirtschaftlicher Kulturpflanzen     

Hans-Peter Vielemeyer  Friedrich Fischer  Werner Bergmann 《Archives of Agronomy and Soil Science》2013,59(8):727-745

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The pathomorphology and pathogenesis of acute cardiovascular failure in swine. 1. Histopathologic findings in the myocardium of swine of different age groups     

V Bergmann  A Gr?fe 《Archiv fuer experimentelle veterinaermedizin》1990,44(4):503-512

Myocardia were histologically examined for the presence of pathomorphological processes in 143 pigs of varying age groups (one, three, seven to nine, and 24 months). Some of them had been slaughtered in clinically intact condition. Others had died of non-cardial diseases. Numerous alterations were recorded, with the following among them being more suitable than others for quantitative assessment and thus objective appraisal of the myocardium: inflammatory infiltrations, granular or hyaline disintegration of fibres, fibre necrosis, dystrophic calcification of fibres, degenerative fat infiltration, and sarcosporidiosis. These parameters were increasingly detectable along with growing age of animals. Inflammatory infiltrations were among the most common findings from pigs for slaughter, aged seven to nine months (40.4 percent of myocardial samples or 58 percent of hearts), followed by muscle fibre necroses (26.4 or 42.0 percent). Most of these disorders were but slightly manifest and were considered to be indicators of catabolic or reparative processes in the myocardium. Attention should be given to them, whenever it comes to pigs with cardiac or circulatory disturbances.  相似文献   

The pathomorphology and pathogenesis of acute cardiovascular failure in swine. 3. Histopathologic findings in the myocardium of swine with transport-related cardiovascular insufficiency     

V Bergmann  A Gr?fe  H Seifert 《Archiv fuer experimentelle veterinaermedizin》1990,44(4):521-532

Quantitative pathohistological investigations were performed on 300 samples of five different myocardial regions from 50 pigs with had suffered stress-related myocardial insufficiency on their transport to the slaughterhouse (transport exhaustion). The findings were compared to 1,200 myocardial samples from 200 clinically intact pigs for slaughter. Animals with transport-related damage exhibited with significance more and more severe inflammatory and degenerative myocardial alterations, such as round-cell infiltration, fiber necrosis, calcification, and fat infiltration. Many of these lesions had been manifest already prior to transport. Myocardially predamaged pigs were less capable than others of sustaining transport stress and were more predisposed to cardiac failure. Stress-related cardiovascular insufficiency, consequently, depended not only on direct stress but also on the general health condition of the myocardium. Causes and pathogenetic relevance of these alterations are discussed in some detail.  相似文献