Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Feeding in the transitional period
Eerden, Ellen van - \ 2018
New poultry nutrition
Eerden, Ellen van - \ 2018
Poultry health: the role of nutrition in controlling and enhancing intestinal integrity
Eerden, Ellen van - \ 2018
Development of the microbial balance in the intestinal tract to explain gut health
Eerden, Ellen van - \ 2018
Effects of inclusion of hydrolyzed yeast on the immune response and performance of piglets after weaning
Molist, F. ; Eerden, E. van; Parmentier, H.K. ; Vuorenmaa, J. - \ 2014
Animal Feed Science and Technology 195 (2014). - ISSN 0377-8401 - p. 136 - 141.
growth-performance - saccharomyces-cerevisiae - natural antibodies - weanling pigs - nutrient digestibility - weaned piglets - supplementation - polysaccharides - challenge - chickens
The aim of this study was to examine whether yeast derivative (YD) based on brewery yeast hydrolyzate added to a post-weaning diet affected performance and immune responses in weaning pigs. One hundred and twenty pigs were allocated to 20 pens, taking initial body weight into account, and were distributed into two groups as follows: a negative control diet and the same diet supplemented with 2 g YD/kg. The YD used was Progut® (Hankkija Oy/Suomen Rehu, Hyvinkää, Finland). At days 7 and 21 of the experiment, half of the piglets per group were challenged intramuscularly with 1 mL of a solution of 20% sheep red blood cells (SRBC) in sterile phosphate buffered saline (PBS). At days 0, 14, 21 and 28 of the experiment, blood samples from the challenged piglets were obtained and acute-phase proteins (Pig-MAP), natural antibodies of the IgM- and IgG-isotype binding to keyhole limpet hemocyanin (KLH), and agglutinating antibody titers to SRBC were measured. Yeast derivative inclusion improved feed conversion ratio (P=0.025) for the overall period, tended to increase IgG (P=0.087) and IgM (P=0.061) antibodies in serum-binding KLH, and increased (P=0.037) SRBC agglutination titers. Collectively, these data suggest that YD supplementation as 2 g Progut®/kg to weanling pigs triggered the immune system to a more responsive state without penalizing the animal performance which could potentially be beneficial for overcoming disease challenges. Piglets fed with 2 g Progut®/kg for 28 days after weaning also showed an improvement in feed conversion ratio.
Differences in fluorescence of doxycycline in chicken bone depending on dosage and treatment time
Groot, M.J. ; Ossenkoppele, J.S. ; Bruchem, G.D. van; Eerden, E. van; Klis, J.D. van der; Nielen, M.W.F. - \ 2014
Effects of herbal products in vitro and in vivo
Groot, M.J. ; Pikkemaat, M.G. ; Driessen-van Lankveld, W.D.M. ; Eerden, M.E. van; Klis, J.D. van der - \ 2013
diervoeding - geneeskrachtige kruiden - voedertoevoegingen - antimicrobe-eigenschappen - anti-infectieuze middelen - diergezondheid - animal nutrition - herbal drugs - feed additives - antimicrobial properties - antiinfective agents - animal health
The aim of the study was to examine the antimicrobial action of herbal feed additives and the relation between this antimicrobial action and performance data in vivo and gut histology (villus/crypt ratio) as parameter for gut health.
Effecten van kruidenproducten in vitro en in vivo
Groot, M.J. ; Pikkemaat, M.G. ; Driessen, J.J.M. ; Eerden, E. van; Klis, J.D. van der - \ 2013
Nederlands Tijdschrift voor Fytotherapie 4 (2013). - ISSN 1384-8925 - p. 16 - 20.
Specific serum antibody responses following a Toxoplasma gondii and Trichinella spiralis co-infection in swine
Bokken, G. ; Eerden, E. van; Opsteegh, M. ; Augustijn, M. ; Graat, E.A.M. ; Franssen, F. ; Görlich, K. ; Buschtöns, S. ; Tenter, A.M. ; Giessen, J.W.B. van der; Bergwerff, A.A. ; Knapen, F. van - \ 2012
Veterinary Parasitology 184 (2012)2-4. - ISSN 0304-4017 - p. 126 - 132.
tissue cysts - pigs - infections - mice - netherlands - diagnosis - britovi - pork
The aim of this study was to examine the dynamics of parasite specific antibody development in Trichinella spiralis and Toxoplasma gondii co-infections in pigs and to compare these with antibody dynamics in T. spiralis and T. gondii single infections. In this experiment, fiftyfour pigs were divided into five inoculated groups of ten animals, and one control group of four animals. Two groups were inoculated with a single dose of either T. gondii tissue cysts or T. spiralis muscle larvae, one group was inoculated simultaneously with both parasites and two groups were successively inoculated at an interval of four weeks. Specific IgG responses to the parasites were measured by ELISA. T. gondii burden was determined by MC-PCR carried out on heart muscle and T. spiralis burden by artificial digestion of diaphragm samples. Specific IgG responses to T. gondii and T. spiralis in single and simultaneously inoculated animals showed a respective T. gondii and T. spiralis inoculation effect but no significant interaction of these parasites to the development of specific antibodies with the serum dilutions used. Moreover, our data showed that the specific IgG response levels in groups of animals successively or simultaneously co-infected were independent of a respective previous or simultaneous infection with the other parasite. Additionally, no differences in parasite burden were found within groups inoculated with T. gondii and within groups inoculated with T. spiralis. Conclusively, for the infection doses tested in this experiment, the dynamics of specific antibody development does not differ between single and simultaneous or successive infection with T. gondii and T. spiralis. However, lower parasitic doses and other ratios of doses, like low-low, low-high and high-low of T. gondii and T. spiralis in co-infection, in combination with other time intervals between successive infections may have different outcomes and should therefore be studied in further detail.
The need for future wetland bird studies: scales of habitat use as input for ecological restoration and spatial water management
Platteeuw, M. ; Foppen, R.P.B. ; Eerden, M.R. van - \ 2010
Ardea 98 (2010)3. - ISSN 0373-2266 - p. 403 - 416.
phalacrocorax-carbo-sinensis - european harriers circus - purple heron - netherlands - population - information - landscape - corridors - drought - climate
All over Europe, wetlands have decreased in size, lost their original dynamics and became fragmented as the consequence of an ever increasing human land use. These processes have resulted in losses of nature values, among which declines in marshland bird populations. Ecological restoration of wetland systems follows from initiatives like EU Bird and Habitat Directives and Water Framework Directive, but may be, in itself, too costly to be widely applied. More promising perspectives to reinforce the wetland part of the ecological network Natura 2000 might come into focus when combined with spatial water management which is primarily aimed at more sustainable safety against flooding. In this way, the wetland network may acquire a wider public and political support. Knowledge on scale-related habitat use of wetland birds can play a role in the process of spatial planning. We illustrate this point by distinguishing four levels of spatial and temporal habitat use by wetland birds, and giving examples for each. The four levels are: (1) birds on stopover sites during migration, (2) territorial breeding birds, (3) colonial breeding birds, and (4) staging birds on wintering sites. This asks for ecological coherence on different scales, e.g. on the international level of migration flyways, on the regional level of landscapes and on the local level of individual wetlands. It is advocated that wetland ecologists dedicate themselves more specifically to quantifying the relevant data on habitat use of birds on each of these scale levels. Meanwhile, spatial planners should try to incorporate them into their efforts in realising combinations of ecological restoration or rehabilitation of wetlands and solutions for sustainable water management. These combinations might turn the tide for some seriously threatened species of marshland and wetland birds.
Residual feed intake in young chickens : effects on energy partitioning and immunity
Eerden, E. van - \ 2007
Wageningen University. Promotor(en): Bas Kemp; Mart de Jong, co-promotor(en): Henry van den Brand. - [S.l.] : S.n. - ISBN 9789085045939 - 168
jonge kippen - voeropname - efficiëntie - middelentoewijzing - energiegebruik - experimentele infectie - immuniteitsreactie - immuniteit - pullets - feed intake - efficiency - resource allocation - energy consumption - experimental infection - immune response - immunity
Profits and losses of dietary efficiency with respect to immune reactivity
Eerden, E. van; Brand, H. van den; Kemp, B. - \ 2006
Dietary efficiency: waste not, want not?
Eerden, E. van; Brand, H. van den; Kemp, B. - \ 2006
Energy Partitioning and Thyroid Hormone Levels During Salmonella enteritidis Infections in Pullets with High or Low Residual Feed Intake
Eerden, E. van; Brand, H. van den; Heetkamp, M.J.W. ; Decuypere, M.P. ; Kemp, B. - \ 2006
Poultry Science 85 (2006)10. - ISSN 0032-5791 - p. 1775 - 1783.
growing layer hens - laying hens - food-consumption - divergent selection - growth-hormone - egg-production - body-weight - efficiency - chicken - lines
This experiment was conducted to investigate whether feed efficiency, as measured by residual feed intake as a phenotypic trait, affects energy partitioning in pullets that have received Salmonella inoculation as an immune challenge. In each of 8 trials, energy partitioning was measured during 5 wk in 15-wk-old efficient (R¿) and nonefficient (R+) pullets, which were housed per efficiency group in 2 identical climate respiration chambers. After 1 wk of adaptation, the pullets in 4 trials were orally inoculated with 108 cfu of Salmonella enteritidis; pullets in the remaining trials were not inoculated and served as controls. Heat production was calculated from continuous recordings of O2 consumption and CO2 production. Energy and N partitioning were recorded on a weekly basis. Blood samples for analyses on thyroid hormones were taken at 16, 17, and 19 wk of age. There were no interactions between efficiency type and Salmonella treatment or Salmonella treatment effects in energy partitioning, except for a short-term increase in heat production in inoculated pullets. Nonefficient pullets had higher gross energy and ME intake, higher estimated ME for maintenance, lower ME:gross energy ratio, and higher total heat production and nonactivity-related heat production compared with R¿ pullets. Triiodothyronine levels in R+ pullets were higher at 16 and 17 wk but were lower at 19 wk of age compared with R¿ pullets. Thyroxine levels were higher in R¿ at 16 wk and showed interactions between efficiency type and Salmonella treatment at 17 and 19 wk of age. Body weights and spleen weights did not differ between efficiency groups. Nonefficient pullets had higher heart, liver, and ovary weights and more large yellow follicles than R¿ pullets. There were no Salmonella effects on body and organ weights. We conclude that R+ pullets have a faster running energy metabolism and that they put more resources into organ development than R¿ pullets. Inoculation with Salmonella has a short-term effect on nonactivity-related heat production but does not affect energy partitioning, regardless of efficiency type
Detection of egg yolk antibodies reflecting Salmonella enteritidis infections using a surface plasmon resonance biosensor
Thomas, M.E. ; Bouma, A. ; Eerden, E. van; Landman, W.J.M. ; Knapen, F. van; Stegeman, J.A. ; Bergwerff, A.A. - \ 2006
Journal of Immunological Methods 315 (2006)1-2. - ISSN 0022-1759 - p. 68 - 74.
laying hens - typhimurium - chickens - elisa - assay - immunosensor - netherlands - antigens - serum
A surface plasmon resonance (SPR) biosensor assay was developed on the basis of a lipopolysaccharide antigen of Salmonella enterica serovar enteritidis (S. enterica serovar enteritidis) to detect egg yolk antibodies against S. enterica serovar enteritidis. This biosensor assay was compared to two commercial ELISA kits based on LPS antigen and flagellar antigen. A number of 163 egg yolk and combined egg white and yolk samples from chickens experimentally infected with S. enterica serovar enteritidis and 90 egg yolk and combined egg white and yolk samples from uninfected chickens were analyzed. Receiver operating characteristic analysis of the data calculated a diagnostic sensitivity of 82% and a diagnostic specificity of 100%. The within-day coefficient of variation of a positive internal-control egg yolk was 1%. The SPR biosensor assay was able to detect antibodies in a significantly higher percentage of known positive samples than the commercial ELISA's. The anticipated use of the SPR biosensor assay is to determine the S. enterica serovar enteritidis serostatus of non-vaccinated layer hens
Een analyse van de mogelijke gevolgen van de aanleg van IJburg tweede fase voor watervogels in de SBZ IJmeer
Schekkerman, H. ; Eerden, M.E. van; Rijn, S. van; Roos, M. - \ 2006
Wageningen : Alterra (Alterra-rapport 1363) - 95
vogels - milieueffect - wildbescherming - stedelijke planning - nederland - amsterdam - birds - environmental impact - wildlife conservation - urban planning - netherlands
De gemeente Amsterdam heeft vergevorderde plannen om in het IJmeer, grenzend aan het Vogelrichtlijngebied (SBZ, Natura 2000 gebied) IJmeer, de tweede fase van de wijk IJburg te realiseren. In dit rapport wordt (1) beschreven welke specifieke waarden van het IJmeer volgens de Vogelrichtlijn dienen te worden beschermd, (2) verkend welke invloed IJburg II op deze waarden zal hebben en of daarbij sprake is van significante gevolgen in het kader van de Vogelrichtlijn, en (3) aangegeven welke mitigerende maatregelen de verstorende effecten van IJburg II kunnen voorkomen. Het rapport zal mede de basis vormen onder een nieuwe versie van het bestemmingsplan voor IJburg II, die vervolgens aan een `passende beoordeling¿ in het kader van de NB-wet 1998 zal worden onderworpen
Salmonella Challenge Affects the Antibody Isotype Profile of Bile in Hens Differing in Metabolic Efficiency
Cotter, P.F. ; Eerden, E. van - \ 2006
Poultry Science 85 (2006)5. - ISSN 0032-5791 - p. 861 - 865.
residual feed-intake - growing layer hens - enteritidis infection - immune-responses - chicken bile - iga - lectin - selection - subclass - jacalin
Gel precipitation reactions determined antibody isotypes in bile from hens differing in dietary efficiency. Ouchterlony double diffusion employing ¿-chain specific goat-anti-chicken IgA, rabbit anti-chicken IgG, goat anti-chicken IgM, black turtle bean (BTB), and Jacalin lectins as precipitating reagents detected bile IgA, IgG, and IgM from Salmonella exposed and nonexposed hens. The IgA was present in 1 of 3 forms designated by reagent and frequency: IgAB (precipitated by BTB lectin) 100%; IgAA (precipitated by anti-¿ chain antibody) 98%, and IgAJ (precipitated by Jacalin) 97%. That both BTB and Jacalin precipitates contain IgA was confirmed by immuno-dot blots using affinity purified ¿-chain specific antibody, establishing each as IgA glycoforms. Three measurements of Ouchterlony precipitates were made; d1 and d2 indicate diffusion from sample or reagent wells, ? indicates arc length. Mean values for ?, estimating quantity, were IgAA (11.3 mm) and IgAB (11.6 mm) and IgAJ (8.3 mm). The crescent shape IgAJ arc and its slower diffusion (d1) suggested its molecular weight is greater than either IgAA or IgAB. Arc lengths of individual samples were not significantly correlated suggesting that these are independent components of bile. Oral Salmonella enteritidis challenge resulted in a highly significant difference in bile IgA profiles. The IgAJ arc lengths (?) in R¿ hens increased by 20% over those in nonchallenged R¿ hens. Conversely S. enteritidis challenge was associated with a decrease of 10% in IgAJ arc lengths in nonefficient (R+) hens. Salmonella enteritidis challenge was not associated with arc length differences in either IgAA or IgAB. The IgG was present in all specimens, and in 9 of 59 (15%) 2 forms were detected. The IgG quantity was unaffected by either efficiency type or S. enteritidis challenge. The IgM was detected in only 2 of 59 (3.4%) specimens. Our observations suggest IgA of bile is composed of multiple forms influenced both by diet efficiency status and S. enteritidis exposure. It appears that the latter resulted in an increased quantity of IgAJ in R¿ hens, and suggests the existence of functional differences among the various IgA types.
Natural Anti-Gal and Salmonella-Specific Antibodies in Bile and Plasma of Hens Differing in Diet Efficiency
Cotter, P.F. ; Eerden, E. van - \ 2006
Poultry Science 85 (2006)3. - ISSN 0032-5791 - p. 435 - 440.
residual feed-intake - growing layer hens - enteritidis infection - immune-responses - selection - chickens
Specific anti-Salmonella enteritidis (SE) and natural anti-¿-gal epitope (Gal¿1-3Galß-1-4GlcNAc-R; anti-Gal) antibodies were measured in plasma sample pools and individual bile specimens obtained from hens differing in diet efficiency. More SE somatic (O) and flagellar (H) antibodies were found in plasma pools from efficient hens (R¿) compared with nonefficient hens (R+) after oral challenge with live SE. Mean titers of somatic agglutinins in bile were 2.3 in R¿ hens and 1.9 in R+ hens (P = 0.06) following live challenge. Salmonella enteritidis antibodies were also found in bile of nonchallenged hens of both types but their levels were not significantly different. Flagellar (H) agglutinin scores were higher in SE-challenged hens compared with nonchallenged hens (3.1 vs. 2.1; P is less than or equal to 0.004) but efficiency types did not differ. Bile also contained high titers of the anti-Gal antibody indicated by the agglutination of glutaraldehyde-stabilized rabbit erythrocytes. The average titer of all SE-nonexposed hens was 9.0 corresponding to 1:5,120 when corrected for the initial dilution and expressed in conventional terms. Salmonella enteritidis exposure was associated with higher anti-Gal titers. The average anti-Gal titer for all SE-exposed hens was 10.0, corresponding to 1:10,240 in conventional terms; this difference was significant (P is less than or equal to 0.016). Diet efficiency type-associated differences in anti-Gal titers were not significant. Collectively, our data indicate that diet efficiency status is not associated with compromised Salmonella-specific immune responses. Rather it appears that the immune responses of diet efficient hens (R¿) are also more efficient. This is because R¿ hens produced higher levels of O- and H-type antibody only as the result of direct exposure to living SE. On the contrary, R+ hens produced H-type antibody because of challenge with heat-killed SE, a circumstance that will not result in disease. Moreover, the hen type difference does not seem to occur at the expense of innate immunity as measured by anti-Gal antibody levels
PRISM Pechora River Integrated System Management : final report first phase: 2003-2005
Eerden, M.R. van; Leummens, H. ; Ponomarev, V. ; Pedroli, G.B.M. ; Roos, M. ; Vries, M. - \ 2005
Lelystad [etc.] : RIZA [etc.] - 16
waterbeheer - rivieren - delta's - rusland - aquatische ecosystemen - water management - rivers - deltas - russia - aquatic ecosystems
PRISM (Pechora River Integrated System Management)
Eerden, M.R. van; Leummens, H. ; Ponomarev, V. ; Pedroli, G.B.M. ; Roos, M. ; Vries, M. - \ 2005
Lelystad : RIZA - ISBN 903695732X - 56 p.
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