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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Dietary fibre enrichment of supplemental feed modulates the development of the intestinal tract in suckling piglets
Hees, H.M.J. Van; Davids, M. ; Maes, D. ; Millet, S. ; Possemiers, S. ; Hartog, L.A. Den; Kempen, T.A.T.G. Van; Janssens, G.P.J. - \ 2019
Journal of Animal Science and Biotechnology 10 (2019)1. - ISSN 1674-9782
Dietary fibre - Gut maturation - Gut microbiota - Suckling piglets

Background: Commercial pre-weaning diets are formulated to be highly digestible and nutrient-dense and contain low levels of dietary fibre. In contrast, pigs in a natural setting are manipulating fibre-rich plant material from a young age. Moreover, dietary fibre affects gastrointestinal tract (GIT) development and health in older pigs. We hypothesised that supplemental diets that contain vegetal fibres are accelerating GIT development in suckling piglets in terms of size and functionality. From d 2 of life, sow-suckled piglets had access to a low fibre diet (CON), a diet with a fermentable long-chain arabinoxylan (lc-AXOS), a diet with a largely non-fermentable purified cellulose (CELL), or a diet containing both fibres. During the initial 2 weeks, the control diet was a high-density milk replacer, followed by a dry and highly digestible creep meal. Upon weaning at 25 d, 15 piglets from each treatment group, identified as eaters and originating from six or seven litters, were sacrificed for post-mortem examination of GIT morphology, small intestinal permeability and metabolic profile of the digesta. The microbiota composition of the mid-colon was evaluated in a sub-set of ten piglets. Results: No major statistical interactions between the fibre sources were observed. Piglets consumed the fibre-containing milk supplements and creep diets well. Stomach size and small intestinal permeability was not affected. Large intestinal fill was increased with lc-AXOS only, while relative large intestinal weight was increased with both fibre sources (P < 0.050). Also, CELL decreased ileal pH and tended to increase ileal DM content compared to CON (P < 0.050). Moreover, the concentration of volatile fatty acids was increased in the caecum (P < 0.100) and mid-colon (P < 0.050) by addition of CELL. lc-AXOS only stimulated caecal propionate (P < 0.050). The microbiota composition showed a high individual variation and limited dietary impact. Nonetheless, CELL induced minor shifts in specific genera, with notable reductions of Escherichia-Shigella. Conclusions: Adding dietary fibres to the supplemental diet of suckling piglets altered large intestinal morphology but not small intestinal permeability. Moreover, dietary fibre showed effects on fermentation and modest changes of microbial populations in the hindgut, with more prominent effects from the low-fermentable cellulose.

Inter- and intra-breed genome-wide copy number diversity in a large cohort of European equine breeds
Solé, Marina ; Ablondi, Michela ; Binzer-Panchal, Amrei ; Velie, Brandon D. ; Hollfelder, Nina ; Buys, Nadine ; Ducro, Bart J. ; François, Liesbeth ; Janssens, Steven ; Schurink, Anouk ; Viklund, Åsa ; Eriksson, Susanne ; Isaksson, Anders ; Kultima, Hanna ; Mikko, Sofia ; Lindgren, Gabriella - \ 2019
BMC Genomics 20 (2019)1. - ISSN 1471-2164 - 1 p.
Copy number variation - Horse - SNP genotyping array - Structural variation

BACKGROUND: Copy Number Variation (CNV) is a common form of genetic variation underlying animal evolution and phenotypic diversity across a wide range of species. In the mammalian genome, high frequency of CNV differentiation between breeds may be candidates for population-specific selection. However, CNV differentiation, selection and its population genetics have been poorly explored in horses. RESULTS: We investigated the patterns, population variation and gene annotation of CNV using the Axiom® Equine Genotyping Array (670,796 SNPs) from a large cohort of individuals (N = 1755) belonging to eight European horse breeds, varying from draught horses to several warmblood populations. After quality control, 152,640 SNP CNVs (individual markers), 18,800 segment CNVs (consecutive SNP CNVs of same gain/loss state or both) and 939 CNV regions (CNVRs; overlapping segment CNVs by at least 1 bp) compared to the average signal of the reference (Belgian draught horse) were identified. Our analyses showed that Equus caballus chromosome 12 (ECA12) was the most enriched in segment CNV gains and losses (~ 3% average proportion of the genome covered), but the highest number of segment CNVs were detected on ECA1 and ECA20 (regardless of size). The Friesian horses showed private SNP CNV gains (> 20% of the samples) on ECA1 and Exmoor ponies displayed private SNP CNV losses on ECA25 (> 20% of the samples). The Warmblood cluster showed private SNP CNV gains located in ECA9 and Draught cluster showed private SNP CNV losses located in ECA7. The length of the CNVRs ranged from 1 kb to 21.3 Mb. A total of 10,612 genes were annotated within the CNVRs. The PANTHER annotation of these genes showed significantly under- and overrepresented gene ontology biological terms related to cellular processes and immunity (Bonferroni P-value < 0.05). We identified 80 CNVRs overlapping with known QTL for fertility, coat colour, conformation and temperament. We also report 67 novel CNVRs. CONCLUSIONS: This work revealed that CNV patterns, in the genome of some European horse breeds, occurred in specific genomic regions. The results provide support to the hypothesis that high frequency private CNVs residing in genes may potentially be responsible for the diverse phenotypes seen between horse breeds.

Typologie van boeren in Flevoland : Een verkenning van typen boeren die het anders willen
Smit, A.B. ; Schoorlemmer, H.A.B. ; Balen, D.J.M. van; Janssens, S.R.M. ; Wolf, P.L. de - \ 2019
Wageningen : Wageningen Economic Research (Wageningen Economic Research rapport 2019-106) - ISBN 9789463951395 - 25
Agriculture in the province of Flevoland is very diverse in identity and presentation. The sector contains different ‘types’ of entrepreneurship besides different subsectors (field and vegetable farming, dairy farming, greenhouse horticulture, flower bulb growing, etc.). These types not only hold conventional, organic and biodynamic agriculture. There is also much variation within these three main stream types as to the motivation of farmers ‘to change’ and the direction in which they are moving. This report contains an inventory of such types and of the innovations that take place within those types.
Gaining insights in the nutritional metabolism of amphibians: analysing body nutrient profiles of the African clawed frog, Xenopus laevis
Brenes-Soto, Andrea ; Dierenfeld, E.S. ; Bosch, G. ; Hendriks, W.H. ; Janssens, Geert P.J. - \ 2019
PeerJ 7 (2019). - ISSN 2167-8359
Metabolism - Nutrition - Xenopus laevis - Body composition - Amino acids - Fatty acids
Whole bodies of Xenopus laevis (n = 19) were analysed for chemical composition and morphometrics. The nutrient profile (macronutrients, amino acids, fatty acids and minerals) was evaluated by sex; interactions among variables with body weights and lengths, and comparisons made with different species of marine and fresh water fish. Significant differences were found in morphometric measurements, water content, several minerals and fatty acids between sexes of X. laevis. Amino acid profiles differed in methionine, proline and cysteine, which could underlie different metabolic pathways in frogs when compared to fish. In addition, fatty acid profiles revealed more monounsaturated and n − 6 polyunsaturated fatty acids in frogs than in fish, more similar to values reported for terrestrial than aquatic vertebrates. Important interactions were also found between body measurements and fat, calcium, and phosphorus, as well as between essential and non-essential amino acids. The results indicate that frogs might have particular biochemical pathways for several nutrients, dependent on sex and linked to body weight, which ultimately could reflect specific nutrient needs
Browse preference in bonobos
Depauw, Sarah ; Janssens, Geert P.J. ; Stevens, Jeroen M.G. ; Bosch, G. - \ 2019
Genomic regions associated with IgE levels against culicoides spp. Antigens in three horse breeds
François, Liesbeth ; Hoskens, Hanne ; Velie, Brandon D. ; Stinckens, Anneleen ; Tinel, Susanne ; Lamberigts, Chris ; Peeters, Liesbet ; Savelkoul, Huub F.J. ; Tijhaar, Edwin ; Lindgren, Gabriella ; Janssens, Steven ; Ducro, Bart J. ; Buys, Nadine ; Schurink, Anouk - \ 2019
Genes 10 (2019)8. - ISSN 2073-4425
Belgian Warmblood horse - Diagnostic ELISA test - Genome-wide association study - Icelandic horse - IgE - Insect bite hypersensitivity - Shetland pony - Summer eczema

Insect bite hypersensitivity (IBH), which is a cutaneous allergic reaction to antigens from Culicoides spp., is the most prevalent skin disorder in horses. Misdiagnosis is possible, as IBH is usually diagnosed based on clinical signs. Our study is the first to employ IgE levels against several recombinant Culicoides spp. allergens as an objective, independent, and quantitative phenotype to improve the power to detect genetic variants that underlie IBH. Genotypes of 200 Shetland ponies, 127 Icelandic horses, and 223 Belgian Warmblood horses were analyzed while using a mixed model approach. No single-nucleotide polymorphism (SNP) passed the Bonferroni corrected significance threshold, but several regions were identified within and across breeds, which confirmed previously identified regions of interest and, in addition, identifying new regions of interest. Allergen-specific IgE levels are a continuous and objective phenotype that allow for more powerful analyses when compared to a case-control set-up, as more significant associations were obtained. However, the use of a higher density array seems necessary to fully employ the use of IgE levels as a phenotype. While these results still require validation in a large independent dataset, the use of allergen-specific IgE levels showed value as an objective and continuous phenotype that can deepen our understanding of the biology underlying IBH.

Development and evaluation of a genome-wide Coffee 8.5K SNP array and its application for high-density genetic mapping and for investigating the origin of Coffea arabica L.
Merot-L'anthoene, Virginie ; Tournebize, Rémi ; Darracq, Olivier ; Rattina, Vimel ; Lepelley, Maud ; Bellanger, Laurence ; Tranchant-Dubreuil, Christine ; Coulée, Manon ; Pégard, Marie ; Metairon, Sylviane ; Fournier, Coralie ; Stoffelen, Piet ; Janssens, Steven B. ; Kiwuka, Catherine ; Musoli, Pascal ; Sumirat, Ucu ; Legnaté, Hyacinthe ; Kambale, Jean Léon ; Ferreira da Costa Neto, João ; Revel, Clara ; Kochko, Alexandre de; Descombes, Patrick ; Crouzillat, Dominique ; Poncet, Valérie - \ 2019
Plant Biotechnology Journal 17 (2019)7. - ISSN 1467-7644 - p. 1418 - 1430.
C. canephora - C. eugenioides - Coffea arabica origin - genetic map - single-nucleotide polymorphism - SNP array

Coffee species such as Coffea canephora P. (Robusta) and C. arabica L. (Arabica) are important cash crops in tropical regions around the world. C. arabica is an allotetraploid (2n = 4x = 44) originating from a hybridization event of the two diploid species C. canephora and C. eugenioides (2n = 2x = 22). Interestingly, these progenitor species harbour a greater level of genetic variability and are an important source of genes to broaden the narrow Arabica genetic base. Here, we describe the development, evaluation and use of a single-nucleotide polymorphism (SNP) array for coffee trees. A total of 8580 unique and informative SNPs were selected from C. canephora and C. arabica sequencing data, with 40% of the SNP located in annotated genes. In particular, this array contains 227 markers associated to 149 genes and traits of agronomic importance. Among these, 7065 SNPs (~82.3%) were scorable and evenly distributed over the genome with a mean distance of 54.4 Kb between markers. With this array, we improved the Robusta high-density genetic map by adding 1307 SNP markers, whereas 945 SNPs were found segregating in the Arabica mapping progeny. A panel of C. canephora accessions was successfully discriminated and over 70% of the SNP markers were transferable across the three species. Furthermore, the canephora-derived subgenome of C. arabica was shown to be more closely related to C. canephora accessions from northern Uganda than to other current populations. These validated SNP markers and high-density genetic maps will be useful to molecular genetics and for innovative approaches in coffee breeding.

Factors driving up prices along the food value chain in Switzerland – Case studies on bread, yoghurt, and cured ham
Logatcheva, K. ; Galen, M.A. van; Janssens, S.R.M. ; Rau, M.L. ; Baltussen, W.H.M. ; Berkum, S. van; Mann, Stefan ; Ferjani, Ali ; Cerca, Mariana - \ 2019
Berne : (Strukturberichterstattung 60/3) - 116 p.
Biological activities associated with the volatile compound 2,5-bis(1-methylethyl)-pyrazine
Janssens, Thierry K.S. ; Tyc, Olaf ; Besselink, Harrie ; Boer, Wietse de; Garbeva, Paolina - \ 2019
FEMS Microbiology Letters 366 (2019)3. - ISSN 0378-1097
Burkholderia - Paenibacillus - mode of action - pyrazine - toxicity - transcriptional reporter assays - volatiles

Pyrazines are 1,4-diazabenzene-based volatile organic compounds and known for their broad-spectrum antimicrobial activity. In the present study, we assessed the antimicrobial activity of 2,5-bis(1-methylethyl)-pyrazine, produced by Paenibacillus sp. AD87 during co-culture with Burkholderia sp. AD24. In addition, we were using transcriptional reporter assays in E. coli and mammalian cells to decipher the possible mode of action. Bacterial and mammalian luciferase reporter strains were deployed to elucidate antimicrobial and toxicological effects of 2,5-bis(1-methylethyl)-pyrazine. At high levels of exposure, 2,5-bis(1-methylethyl)-pyrazine exerted strong DNA damage response. At lower concentrations, cell-wall damage response was observed. The activity was corroborated by a general toxicity reporter assay in E. coli ΔampD, defective in peptidoglycan turnover. The maximum E. coli cell-wall stress activity was measured at a concentration close to the onset of the mammalian cytotoxicity, while other adverse outcome pathways, such as the activation of aryl hydrocarbon and estrogenic receptor, the p53 tumour suppressor and the oxidative stress-related Nrf2 transcription factor, were induced at elevated concentrations compared to the response of mammalian cells. Because of its broad-spectrum antimicrobial activity at lower concentrations and the relatively low mammalian toxicity, 2,5-bis(1-methylethyl)-pyrazine is a potential bio-based fumigant with possible applications in food industry, agriculture or logistics.

Effecten van mogelijke maatregelen ter beheer van de bestanden van brasem, blankvoorn, snoekbaars en baars in het IJssel- en Markermeer
Zaalmink, Wim ; Tien, Nicola ; Prins, Henri ; Leeuw, Joep de; Janssens, Bas - \ 2019
Wageningen : Wageningen Economic Research (Wageningen Economic Research nota 2019-007) - 55
The Ministry of Agriculture, Nature, and Food Quality wants to achieve a 36% catch reduction of roach and bream for the gill net and seine fishery on the IJsselmeer and the Markermeer. This catch reduction should contribute to the preservation of the scaly-fish stocks of roach, bream, perch, and pike-perch. Ten measures were researched with the potential to contribute to the 36% catch reduction. The measures which can be implemented in the short term and which are easily enforceable are a 36% reduction of the current fishing effort and a closure of the fisheries during the period of 1 January to 15 March, or a shorter period within that time-span. Because the gill net fishery is a mixed fishery, no measure will lead to a proportional, effective impact for all four stocks. The abovementioned measures will lead to a loss of income which may be unevenly distributed among the fishermen.
Overgangstermijn innemen ongebruikte rechten voor staande netten IJsselmeervisserij
Zaalmink, Wim ; Prins, Henri ; Janssens, Bas - \ 2019
Den Haag : Wageningen Economic Research (Wageningen Economic Research nota 2019-006) - 19
De rechten voor staande netten die gebruikt mogen worden voor de schubvisvisserij op het IJsselmeer zijn sinds 2014 gereduceerd met 85%. De sindsdien niet gebruikte rechten brengen bij uitgifte en controle onnodige administratieve lasten met zich mee, zijn daarmee foutgevoelig en kunnen leiden tot een niet realistische beeldvorming over toekomstig gebruik in de visserijpraktijk. Daarom overweegt de minister van Landbouw, Natuur en Voedselkwaliteit (LNV) maatregelen te treffen om deze rechten in te nemen. De vraag is of vissers hier schade van ondervinden, of er een balans is tussen enerzijds het ondernemersbelang en anderzijds het maatschappelijke belang, en welke overgangstermijn passend is om deze maatregelen in te laten gaan.
Copy number variations in Friesian horses and genetic risk factors for insect bite hypersensitivity
Schurink, A. ; Silva, Vinicius da; Velie, Brandon D. ; Dibbits, B.W. ; Crooijmans, R.P.M.A. ; François, Liesbeth ; Janssens, Steven ; Stinckens, Anneleen ; Blott, Sarah ; Buys, Nadine ; Lindgren, Gabriella ; Ducro, B.J. - \ 2018
copy number variations - Friesian horse - genome-wide association study - insect bite hypersensitivity
Background Many common and relevant diseases affecting equine welfare have yet to be tested regarding structural variants such as copy number variations (CNVs). CNVs make up a substantial proportion of total genetic variability in populations of many species, resulting in more sequence differences between individuals than SNPs. Associations between CNVs and disease phenotypes have been established in several species, but equine CNV studies have been limited. Aim of this study was to identify CNVs and to perform a genome-wide association (GWA) study in Friesian horses to identify genomic loci associated with insect bite hypersensitivity (IBH), a common seasonal allergic dermatitis observed in many horse breeds worldwide. Results Genotypes were obtained using the AxiomÂŽ Equine Genotyping Array containing 670,796 SNPs. After quality control of genotypes, 15,041 CNVs and 5350 CNV regions (CNVRs) were identified in 222 Friesian horses. Coverage of the total genome by CNVRs was 11.2% with 49.2% of CNVRs containing genes. 58.0% of CNVRs were novel (i.e. so far only identified in Friesian horses). A SNP- and CNV-based GWA analysis was performed, where about half of the horses were affected by IBH. The SNP-based analysis showed a highly significant association between the MHC region on ECA20 and IBH in Friesian horses. Associations between the MHC region on ECA20 and IBH were also detected based on the CNV-based analysis. However, CNVs associated with IBH in Friesian horses were not often in close proximity to SNPs identified to be associated with IBH. Conclusions CNVs were identified in a large sample of the Friesian horse population, thereby contributing to our knowledge on CNVs in horses and facilitating our understanding of the equine genome and its phenotypic expression. A clear association was identified between the MHC region on ECA20 and IBH in Friesian horses based on both SNP- and CNV-based GWA studies. These results imply that MHC contributes to IBH sensitivity in Friesian horses. Although subsequent analyses are needed for verification, nucleotide differences, as well as more complex structural variations like CNVs, seem to contribute to IBH sensitivity. IBH should be considered as a common disease with a complex genomic architecture.
Nadeelcompensatie visserijvrije zones : systematiek en indicatie van bedragen
Zaalmink, Wim ; Janssens, Bas ; Prins, Henri - \ 2018
Wageningen : Wageningen Economic Research (Wageningen Economic Research nota 2019-045) - 30
Het ministerie van LNV onderzoekt de consequenties van het instellen van visserijvrije zones (VVZ’s) rondom vismigratievoorzieningen. Hierbij kan de mogelijkheid zich voordoen dat vistuigen hiervoor moeten wijken. De vraag is welke vergoedingen hiervoor moeten worden uitgekeerd, en hoe deze kunnen worden berekend. Er zijn geen sluitende vangstregistratiesystemen waarmee vissers de besommingen van specifieke fuiken kunnen aantonen. Er is een brede range waarbinnen de gemiddelde vangsten per vaste fuik bewegen. De berekende gemiddelde onteigeningswaarde bedraagt voor binnendijkse vaste fuiken 4.680 euro, voor buitendijkse vaste fuiken 1.560 euro en voor binnendijks viswater 234 euro per ha.
What's gotten into the frog? Insights from the body composition of an amphibian, Xenopus laevis
Brenes-Soto, Andrea ; Dierenfeld, E.S. ; Bosch, G. ; Hendriks, W.H. ; Janssens, Geert P.J. - \ 2018
Business opportunities Croatian fruit and vegetables growers
Logatcheva, Katja ; Galen, Michiel van; Janssens, Bas ; Splinter, Gerben - \ 2018
Wageningen : Wageningen Economic Research (Wageningen Economic Research report 2018-002) - ISBN 9789463437615 - 101
The European Bank for Reconstruction and Development (EBRD) has asked Wageningen Economic Research to carry out a study on the Croatian fruit and vegetables sector and value chain to make a contribution to the enhancement of the position of growers in the value chain. The study shows that the Croatian fruit and vegetables farming sector has opportunities in the development of the domestic supermarket channel and tourism markets. In the short run, growers will benefit from improving yields, efficiency and product quality. Increasing supply volumes and hence marketing efficiency can also be achieved by improved cooperation between farmers and further land reform measures. A good competitive position on the domestic market is a necessary pre-condition for increasing exports. In the longer term, in order to be able to develop export markets, the sector will benefit from the development of a buyers network, marketing, EU quality labels, and export logistics.
Communicatie over duurzame vis in de visdetailhandel
Janssens, S.R.M. ; Vos, B.I. de - \ 2018
Wageningen : Wageningen University & Research, Wetenschapswinkel (Wetenschapswinkel rapport 329) - ISBN 9789463432283 - 54
Copy number variations in Friesian horses and genetic risk factors for insect bite hypersensitivity
Schurink, Anouk ; Silva, Vinicius H. da; Velie, Brandon D. ; Dibbits, Bert W. ; Crooijmans, Richard P.M.A. ; François, Liesbeth ; Janssens, Steven ; Stinckens, Anneleen ; Blott, Sarah ; Buys, Nadine ; Lindgren, Gabriella ; Ducro, Bart J. - \ 2018
BMC Genetics 19 (2018)1. - ISSN 1471-2156
Copy number variations - Friesian horse - Genome-wide association study - Insect bite hypersensitivity

Background: Many common and relevant diseases affecting equine welfare have yet to be tested regarding structural variants such as copy number variations (CNVs). CNVs make up a substantial proportion of total genetic variability in populations of many species, resulting in more sequence differences between individuals than SNPs. Associations between CNVs and disease phenotypes have been established in several species, but equine CNV studies have been limited. Aim of this study was to identify CNVs and to perform a genome-wide association (GWA) study in Friesian horses to identify genomic loci associated with insect bite hypersensitivity (IBH), a common seasonal allergic dermatitis observed in many horse breeds worldwide. Results: Genotypes were obtained using the Axiom® Equine Genotyping Array containing 670,796 SNPs. After quality control of genotypes, 15,041 CNVs and 5350 CNV regions (CNVRs) were identified in 222 Friesian horses. Coverage of the total genome by CNVRs was 11.2% with 49.2% of CNVRs containing genes. 58.0% of CNVRs were novel (i.e. so far only identified in Friesian horses). A SNP- and CNV-based GWA analysis was performed, where about half of the horses were affected by IBH. The SNP-based analysis showed a highly significant association between the MHC region on ECA20 and IBH in Friesian horses. Associations between the MHC region on ECA20 and IBH were also detected based on the CNV-based analysis. However, CNVs associated with IBH in Friesian horses were not often in close proximity to SNPs identified to be associated with IBH. Conclusions: CNVs were identified in a large sample of the Friesian horse population, thereby contributing to our knowledge on CNVs in horses and facilitating our understanding of the equine genome and its phenotypic expression. A clear association was identified between the MHC region on ECA20 and IBH in Friesian horses based on both SNP- and CNV-based GWA studies. These results imply that MHC contributes to IBH sensitivity in Friesian horses. Although subsequent analyses are needed for verification, nucleotide differences, as well as more complex structural variations like CNVs, seem to contribute to IBH sensitivity. IBH should be considered as a common disease with a complex genomic architecture.

Positie primaire producent in de keten : samenwerking en prijsvorming
Baltussen, Willy ; Galen, Michiel van; Logatcheva, Katja ; Reinders, Machiel ; Schebesta, Hanna ; Splinter, Gerben ; Doornewaard, Gerben ; Horne, Peter van; Hoste, Robert ; Janssens, Bas ; Meer, Ruud van der; Stokkers, Rob - \ 2018
Wageningen : Wageningen Economic Research (Wageningen Economic Research rapport 2018-027) - ISBN 9789463437929 - 59
Long-term impact of zinc supplementation in sows : Impact on zinc status biomarkers and performance
Riet, Miriam M.J. Van; Bos, Emilie Julie ; Ampe, Bart ; Bikker, Paul ; Vanhauteghem, Donna ; Bockstaele, Filip Van; Cornillie, Pieter ; Broeck, Wim Van Den; Laing, Gijs Du; Maes, Dominiek ; Tuyttens, Frank A.M. ; Janssens, Geert P.J. ; Millet, Sam - \ 2018
Journal of Swine Health and Production 26 (2018)2. - ISSN 1537-209X - p. 79 - 94.
Dietary zinc concentration - Performance - Rubber top layer flooring - Swine - Zinc status biomarkers
Objectives: To evaluate the long-term impact of zinc (Zn) supplementation on performance and Zn status biomarkers in sows and on whether this possible impact depends on housing conditions. Materials and methods: Six groups of sows were allotted to group housing on two different floor types during gestation. Within each group, sows were randomly allocated to one of three diets varying in the amount of Zn supplemented (0, 50, or 100 mg added Zn per kg diet; 50% ZnO: 50% organic Zn) to a basal diet containing 46.6 and 128.9 mg Zn per kg during gestation and lactation, respectively. Blood was collected at days 0, 50, 108, and 143 of every cycle and analyzed for plasma Zn and copper and serum metallothionein (MT) concentrations. After slaughter, mineral concentrations of metacarpals, liver, and abaxial horn wall were determined. Results: Dietary Zn supplementation beyond basal dietary Zn concentrations did not influence serum MT concentrations (P = .77) and Zn concentrations in blood plasma (P = .13), liver (P = .54), bone (P = .26), and horn wall (P = .39). The 100-mg Zn per kg supplemented sows had lower bodyweight, body condition score, and backfat thickness (P < .001). The lack of impact of Zn supplementation may have been (partly) attributed to the unexpected high supply of Zn through premix in the lactation diet. Implications: Under these study conditions, commercially grown sows might not need Zn supplementation during gestation when their basal diet contains Zn with phytase.
Positieve handelsbalans voor bevroren aardappelproducten
Janssens, S.R.M. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 43 - 46.
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