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.

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    Fixed or mixed? Variation in tree functional types and vegetation structure in a forest-savanna ecotone in West Africa
    Ametsitsi, George K.D. ; Langevelde, Frank Van; Logah, Vincent ; Janssen, Thomas ; Medina-Vega, Jose A. ; Issifu, Hamza ; Ollivier, Laurianne ; Hartogh, Koos Den; Adjei-Gyapong, Thomas ; Adu-Bredu, Stephen ; Lloyd, Jon ; Veenendaal, Elmar M. - \ 2020
    Journal of Tropical Ecology 36 (2020)4. - ISSN 0266-4674 - p. 133 - 149.
    Alternate stable states - canopy cover - forest-savanna ecotone - soil properties - vegetation structure

    We analysed thirty-five 400-m2 plots encompassing forest, savanna and intermediate vegetation types in an ecotonal area in Ghana, West Africa. Across all plots, fire frequency was over a period of 15 years relatively uniform (once in 2-4 years). Although woodlands were dominated by species typically associated with savanna-type formations, and with forest formations dominated by species usually associated with closed canopies, these associations were non-obligatory and with a discrete non-specialized species grouping also identified. Across all plots, crown area index, stem basal area and above-ground biomass were positively associated with higher soil exchangeable potassium and silt contents: This supporting recent suggestions of interplays between potassium and soil water storage potential as a significant influence on tropical vegetation structure. We also found an average NDVI cover increase of ∼0.15% year-1 (1984-2011) with plots dominated by non-specialized species increasing more than those dominated by either forest-or savanna-affiliated species. Our results challenge the traditional view of a simple forest vs. savanna dichotomy controlled by fire, and with our newly identified third non-specialized species grouping also potentially important in understanding ecotonal responses to climate change.

    A multi-model approach for analysing water balance and water-related ecosystem services in the Ouriyori catchment (Benin)
    Togbévi, Quentin Fiacre ; Bossa, Aymar Yaovi ; Yira, Yacouba ; Preko, Kwasi ; Sintondji, Luc Ollivier ; Ploeg, Martine van der - \ 2020
    Hydrological Sciences Journal 65 (2020)14. - ISSN 0262-6667 - p. 2453 - 2465.
    Benin - catchment - hydrological ecosystem services - multi-modelling - SWAT - WaSiM

    Freshwater supply remains limited in West Africa due to lack of operational governance frameworks. In this study, the Water flow and balance Simulation Model (WaSiM) and the Soil and Water Assessment Tool (SWAT) were applied in the Ouriyori catchment (14.5 km2, Benin) to assess hydrological ecosystem services (HES) in terms of service flow and service capacity using the ecosystem accounting framework. The modelling exercises indicated satisfactory goodness-of-fit coefficients greater than 75% with an absolute bias of less than 25%. The HES capacity was in general higher than the HES flow for crop and household (surface/groundwater) water supplies, indicating that the catchment can potentially supply more water under optimal storage and management conditions. Positive and negative shifts in service capacities of crop water and household supplies were observed over the simulation period. These significant results can support sustainable interventions in securing water and food productions through increasing HES flow and capacity.

    Do wealthy farmers implement better agricultural practices? An assessment of implementation of Good Agricultural Practices among different types of independent oil palm smallholders in Riau, Indonesia
    Jelsma, Idsert ; Woittiez, Lotte S. ; Ollivier, Jean ; Dharmawan, Arya Hadi - \ 2019
    Agricultural Systems 170 (2019). - ISSN 0308-521X - p. 63 - 76.
    Farmer typology - Indonesia - Intensification - Land use - Oil palm - Smallholders

    Palm oil has become a leading vegetable oil over the past 30 years and smallholder farmers in Indonesia, with more than 12 million hectare the world's largest producer of palm oil, have massively engaged in oil palm (Elaeis guineensis) cultivation. In Sumatra, where more than 60% of Indonesian palm oil is cultivated, smallholders currently cover roughly 50% of the oil palm area. The rapid expansion of palm oil however did not happen without controversy. In current efforts by the Indonesian government, NGO's and private sector to improve sector performance, smallholders are often characterized as the Achilles heel of the oil palm sector due to poor practices and low yields compared to companies. However, ‘oil palm smallholders’ is a container concept and there has been only limited research into smallholder diversity beyond the organised versus independent farmer dichotomy. This research delves into the implementation of Good Agricultural Practices (GAP) among seven types of independent smallholders in Rokan Hulu regency, Riau province. The research area consisted of a relative established agricultural area on mineral soils and a relative frontier, mostly on peat. Smallholder types ranged from small local farmers to large farmers who usually reside in urban areas far from their plantation and regard oil palm cultivation as an investment opportunity. The underlying hypothesis is that larger farmers have more capital and therefore implement better agricultural practices than small farmers, who are usually more cash constrained. A wide range of methods was applied, including farmer and farm surveys, remote sensing, tissue analysis and photo interpretation by experts. These methods provided data on fertilizer use, nutrient conditions in oil palms, planting material, planting patterns, and other management practices in the plantations. Results show that yields are poor, implementation of GAP are limited and there is much room for improvement among all farmer types. Poor planting materials, square planting patterns, and limited nutrient applications were particularly prevalent. This implies that farmers across different typologies opt for a low-input low-output system for a myriad of reasons and that under current conditions, initiatives such as improving access to finance or availability of good planting material alone are unlikely to significantly improve the productivity and sustainability of the smallholder oil palm sector.

    Effector diversification within compartments of the Leptosphaeria maculans genome affected by repeat induced point mutations
    Rouxel, T. ; Grandaubert, J. ; Hane, J.K. ; Hoede, C. ; Wouw, A. ; Couloux, A. ; Dominguez, V. ; Anthouard, V. ; Bally, P. ; Bourras, S. ; Cozijnsen, A.J. ; Ciuffetti, L.M. ; Degrave, A. ; Dilmaghani, A. ; Duret, L. ; Fudal, L. ; Goodwin, S.B. ; Gout, L. ; Glaser, N. ; Linglin, J. ; Kema, G.H.J. ; Lapalu, N. ; Lawrence, C.B. ; May, K. ; Meyer, M. ; Ollivier, B. ; Poulain, J. ; Schoch, C.L. ; Simon, A. ; Spatafora, J.W. ; Stachowiak, A. ; Turgeon, B.G. ; Tyler, B.M. ; Vincent, D. ; Weissenbach, J. ; Amselem, J. ; Quesneville, H. ; Oliver, R.P. ; Wincker, P. ; Balesdent, M.H. ; Howlett, B.J. - \ 2011
    Nature Communications 2 (2011). - ISSN 2041-1723 - p. 202 - 202.
    transposable elements - molecular evolution - pathogen effectors - brassica-napus - gene-transfer - oilseed rape - stem canker - avirulence - plant - fungal
    Fungi are of primary ecological, biotechnological and economic importance. Many fundamental biological processes that are shared by animals and fungi are studied in fungi due to their experimental tractability. Many fungi are pathogens or mutualists and are model systems to analyse effector genes and their mechanisms of diversification. In this study, we report the genome sequence of the phytopathogenic ascomycete Leptosphaeria maculans and characterize its repertoire of protein effectors. The L. maculans genome has an unusual bipartite structure with alternating distinct guanine and cytosine-equilibrated and adenine and thymine (AT)-rich blocks of homogenous nucleotide composition. The AT-rich blocks comprise one-third of the genome and contain effector genes and families of transposable elements, both of which are affected by repeat-induced point mutation, a fungal-specific genome defence mechanism. This genomic environment for effectors promotes rapid sequence diversification and underpins the evolutionary potential of the fungus to adapt rapidly to novel host-derived constraints
    Genome sequence of the pea aphid Acyrthosiphon pisum
    Richards, Stephen ; Gibbs, Richard A. ; Gerardo, Nicole M. ; Moran, Nancy ; Nakabachi, Atsushi ; Stern, David ; Tagu, Denis ; Wilson, Alex C.C. ; Muzny, Donna ; Kovar, Christie ; Cree, Andy ; Chacko, Joseph ; Chandrabose, Mimi N. ; Dao, Marvin Diep ; Dinh, Huyen H. ; Gabisi, Ramatu Ayiesha ; Hines, Sandra ; Hume, Jennifer ; Jhangian, Shalini N. ; Joshi, Vandita ; Lewis, Lora R. ; Liu, Yih Shin ; Lopez, John ; Morgan, Margaret B. ; Nguyen, Ngoc Bich ; Okwuonu, Geoffrey O. ; Ruiz, San Juana ; Santibanez, Jireh ; Wright, Rita A. ; Fowler, Gerald R. ; Hitchens, Matthew E. ; Lozado, Ryan J. ; Moen, Charles ; Steffen, David ; Warren, James T. ; Zhang, Jingkun ; Nazareth, Lynne V. ; Chavez, Dean ; Davis, Clay ; Lee, Sandra L. ; Patel, Bella Mayurkumar ; Pu, Ling Ling ; Bell, Stephanie N. ; Johnson, Angela Jolivet ; Vattathil, Selina ; Williams, Rex L. ; Shigenobu, Shuji ; Dang, Phat M. ; Morioka, Mizue ; Fukatsu, Takema ; Kudo, Toshiaki ; Miyagishima, Shin Ya ; Jiang, Huaiyang ; Worley, Kim C. ; Legeai, Fabrice ; Gauthier, Jean Pierre ; Collin, Olivier ; Zhang, Lan ; Chen, Hsiu Chuan ; Ermolaeva, Olga ; Hlavina, Wratko ; Kapustin, Yuri ; Kiryutin, Boris ; Kitts, Paul ; Maglott, Donna ; Murphy, Terence ; Pruitt, Kim ; Sapojnikov, Victor ; Souvorov, Alexandre ; Thibaud-Nissen, Françoise ; Câmara, Francisco ; Guigó, Roderic ; Stanke, Mario ; Solovyev, Victor ; Kosarev, Peter ; Gilbert, Don ; Gabaldón, Toni ; Huerta-Cepas, Jaime ; Marcet-Houben, Marina ; Pignatelli, Miguel ; Moya, Andrés ; Rispe, Claude ; Ollivier, Morgane ; Quesneville, Hadi ; Permal, Emmanuelle ; Llorens, Carlos ; Futami, Ricardo ; Hedges, Dale ; Robertson, Hugh M. ; Alioto, Tyler ; Mariotti, Marco ; Nikoh, Naruo ; McCutcheon, John P. ; Burke, Gaelen ; Kamins, Alexandra ; Latorre, Amparo ; Ashton, Peter ; Calevro, Federica ; Charles, Hubert ; Colella, Stefano ; Douglas, Angela E. ; Jander, Georg ; Jones, Derek H. ; Febvay, Gérard ; Kamphuis, Lars G. ; Kushlan, Philip F. ; Macdonald, Sandy ; Ramsey, John ; Schwartz, Julia ; Seah, Stuart ; Thomas, Gavin ; Vellozo, Augusto ; Cass, Bodil ; Degnan, Patrick ; Hurwitz, Bonnie ; Leonardo, Teresa ; Koga, Ryuichi ; Altincicek, Boran ; Anselme, Caroline ; Atamian, Hagop ; Barribeau, Seth M. ; Vos, Martin De; Duncan, Elizabeth ; Evans, Jay ; Ghanim, Murad ; Heddi, Abdelaziz ; Kaloshian, Isgouhi ; Vincent-Monegat, Carole ; Parker, Ben J. ; Pérez-Brocal, Vicente ; Rahbé, Yvan ; Spragg, Chelsea J. ; Tamames, Javier ; Tamarit, Daniel ; Tamborindeguy, Cecilia ; Vilcinskas, Andreas ; Bickel, Ryan D. ; Brisson, Jennifer A. ; Butts, Thomas ; Chang, Chun Che ; Christiaens, Olivier ; Davis, Gregory K. ; Duncan, Elizabeth ; Ferrier, David ; Iga, Masatoshi ; Janssen, Ralf ; Lu, Hsiao Ling ; McGregor, Alistair ; Miura, Toru ; Smagghe, Guy ; Smith, James ; Zee, Maurijn Van Der; Velarde, Rodrigo ; Wilson, Megan ; Dearden, Peter ; Edwards, Owain R. ; Gordon, Karl ; Hilgarth, Roland S. ; Rider, Stanley Dean ; Srinivasan, Dayalan ; Walsh, Thomas K. ; Ishikawa, Asano ; Jaubert-Possamai, Stéphanie ; Fenton, Brian ; Huang, Wenting ; Rizk, Guillaume ; Lavenier, Dominique ; Nicolas, Jacques ; Smadja, Carole ; Zhou, Jing Jiang ; Vieira, Filipe G. ; He, Xiao Li ; Liu, Renhu ; Rozas, Julio ; Field, Linda M. ; Campbell, Peter ; Carolan, James C. ; Fitzroy, Carol I.J. ; Reardon, Karen T. ; Reeck, Gerald R. ; Singh, Karam ; Wilkinson, Thomas L. ; Huybrechts, Jurgen ; Abdel-Latief, Mohatmed ; Robichon, Alain ; Veenstra, Jan A. ; Hauser, Frank ; Cazzamali, Giuseppe ; Schneider, Martina ; Williamson, Michael ; Stafflinger, Elisabeth ; Hansen, Karina K. ; Grimmelikhuijzen, Cornelis J.P. ; Price, Daniel R.G. ; Caillaud, Marina ; Fleet, Eric Van; Ren, Qinghu ; Gatehouse, John A. ; Brault, Véronique ; Monsion, Baptiste ; Diaz, Jason ; Hunnicutt, Laura ; Ju, Ho Jong ; Pechuan, Ximo ; Aguilar, José ; Cortés, Teresa ; Ortiz-Rivas, Benjamín ; Martínez-Torres, David ; Dombrovsky, Aviv ; Dale, Richard P. ; Davies, T.G.E. ; Williamson, Martin S. ; Jones, Andrew ; Sattelle, David ; Williamson, Sally ; Wolstenholme, Adrian ; Cottret, Ludovic ; Sagot, Marie France ; Heckel, David G. ; Hunter, Wayne - \ 2010
    PloS Biology 8 (2010)2. - ISSN 1544-9173

    Aphids are important agricultural pests and also biological models for studies of insect-plant interactions, symbiosis, virus vectoring, and the developmental causes of extreme phenotypic plasticity. Here we present the 464 Mb draft genome assembly of the pea aphid Acyrthosiphon pisum. This first published whole genome sequence of a basal hemimetabolous insect provides an outgroup to the multiple published genomes of holometabolous insects. Pea aphids are host-plant specialists, they can reproduce both sexually and asexually, and they have coevolved with an obligate bacterial symbiont. Here we highlight findings from whole genome analysis that may be related to these unusual biological features. These findings include discovery of extensive gene duplication in more than 2000 gene families as well as loss of evolutionarily conserved genes. Gene family expansions relative to other published genomes include genes involved in chromatin modification, miRNA synthesis, and sugar transport. Gene losses include genes central to the IMD immune pathway, selenoprotein utilization, purine salvage, and the entire urea cycle. The pea aphid genome reveals that only a limited number of genes have been acquired from bacteria; thus the reduced gene count of Buchnera does not reflect gene transfer to the host genome. The inventory of metabolic genes in the pea aphid genome suggests that there is extensive metabolite exchange between the aphid and Buchnera, including sharing of amino acid biosynthesis between the aphid and Buchnera. The pea aphid genome provides a foundation for post-genomic studies of fundamental biological questions and applied agricultural problems.

    An assessment of the European pig diversity using molecular markers: partitioning of diversity among breeds
    Ollivier, L. ; Alderson, L. ; Gandini, G.C. ; Foulley, J.L. ; Haley, C.S. ; Joosten, R. ; Rattink, A.P. ; Harlizius, B. ; Groenen, M.A.M. - \ 2005
    Conservation Genetics 6 (2005)5. - ISSN 1566-0621 - p. 729 - 741.
    dierveredeling - varkens - varkensrassen - genetische diversiteit - genetische merkers - microsatellieten - moleculaire genetica - cryopreservering - kruising - conservering - uitsterven - rasverschillen - biodiversiteit - aflp - animal breeding - pigs - pig breeds - genetic diversity - genetic markers - microsatellites - molecular genetics - cryopreservation - crossbreds - conservation - extinction - breed differences - biodiversity - amplified fragment length polymorphism - subdivided populations - conservation genetics - livestock breeds - cattle breeds - management - distance - purposes - size
    Genetic diversity within and between breeds (and lines) of pigs was investigated. The sample comprised 68 European domestic breeds (and lines), including 29 local breeds, 18 varieties of major international breeds, namely Duroc, Hampshire, Landrace, Large White and Piétrain, and 21 commercial lines either purebred or synthetic, to which the Chinese Meishan and a sample of European wild pig were added. On average 46 animals per breed were sampled (range 12–68). The genetic markers were microsatellites (50 loci) and AFLP (amplified fragment length polymorphism, 148 loci). The analysis of diversity showed that the local breeds accounted for 56% of the total European between-breed microsatellite diversity, and slightly less for AFLP, followed by commercial lines and international breeds. Conversely, the group of international breeds contributed most to within-breed diversity, followed by commercial lines and local breeds. Individual breed contributions to the overall European between- and within-breed diversity were estimated. The range in between-breed diversity contributions among the 68 breeds was 0.04–3.94% for microsatellites and 0.24–2.94% for AFLP. The within-breed diversity contributions varied very little for both types of markers, but microsatellite contributions were negatively correlated with the between-breed contributions, so care is needed in balancing the two types of contribution when making conservation decisions. By taking into account the risks of extinction of the 29 local breeds, a cryopreservation potential (priority) was estimated for each of them.
    Criteria to assess the degree of endangerment of livestock breeds in Europe
    Gandini, G.C. ; Ollivier, L. ; Danell, B. ; Distl, O. ; Georgoudis, A. ; Groeneveld, E. ; Martyniuk, E. ; Arendonk, J.A.M. van; Woolliams, J.A. - \ 2004
    Livestock Production Science 91 (2004)1-2. - ISSN 0301-6226 - p. 173 - 182.
    dierveredeling - rundvee - rundveerassen - bedreigde rassen - uitsterven - conservering - genetische bronnen van diersoorten - genetische variatie - genetische bronnen - veredelingsprogramma's - fokwaarde - demografie - populatiegroei - europa - animal breeding - cattle - cattle breeds - endangered breeds - extinction - conservation - animal genetic resources - genetic variation - genetic resources - breeding programmes - breeding value - demography - population growth - europe - overlapping generations - predicting rates - populations - selection - diversity
    The degree to which a breed is exposed to becoming extinct, i.e. its degree of endangerment (DE), is an essential information to orient conservation policies. Assessing DE properly is a difficult task, as numerous factors are involved. Several methods are currently used in Europe and the paper first discusses the development of some objective criteria to promote the creation of a uniform system. Both demographic and genetic aspects of population decline are considered. It is proposed to estimate the number of years needed to reach a critical population size, which is also a measure of time available to evaluate options and undertake action before extinction. Thresholds of endangerment for both the demographic and genetic aspects are discussed. In addition, the population growth rate of 110 European cattle breeds is analysed. Growth rate is normally distributed with a mean of 1.00 (S.D. 0.09, range 0.77-1.27). Population size at the beginning of the analysed period and country of breeding affect growth rate significantly
    The degree to which a breed is exposed to becoming extinct, i.e. its degree of endangerment (DE), is an essential information to orient conservation policies. Assessing DE properly is a difficult task, as numerous factors are involved. Several methods are currently used in Europe and the paper first discusses the development of some objective criteria to promote the creation of a uniform system. Both demographic and genetic aspects of population decline are considered. It is proposed to estimate the number of years needed to reach a critical population size, which is also a measure of time available to evaluate options and undertake action before extinction. Thresholds of endangerment for both the demographic and genetic aspects are discussed. In addition, the population growth rate of 110 European cattle breeds is analysed. Growth rate is normally distributed with a mean of 1.00 (S.D. 0.09, range 0.77-1.27). Population size at the beginning of the analysed period and country of breeding affect growth rate significantly. (C) 2004 Elsevier B.V. All rights reserved.
    The development of criteria for evaluating the degree of endangerment of livestock breeds in Europe
    Banell, B. ; Distl, O. ; Georgoudis, A. ; Groeneveld, E. ; Martyniuk, E. ; Ollivier, L. ; Arendonk, J.A.M. van; Woolliams, J. - \ 2001
    In: Book of abstracts no. 7 : 52nd Meeting of the European Association for Animal Production, Budapest, 2001. - Budapest : [s.n.], 2001 - p. 76 - 76.
    Genetic diversity of 11 European pig breeds
    Lavall, G. ; Iannuccelli, N. ; Legault, C. ; Milan, D. ; Groenen, M.A.M. ; Andersson, L. ; Fredholm, M. ; Geldermann, H. ; Foulley, J.L. ; Chevalet, C. ; Ollivier, L. - \ 2000
    Genetics, Selection, Evolution 32 (2000)2. - ISSN 0999-193X - p. 187 - 203.
    A set of eleven pig breeds originating from six European countries, and including a small sample of wild pigs, was chosen for this study of genetic diversity. Diversity was evaluated on the basis of 18 microsatellite markers typed over a total of 483 DNA samples collected. Average breed heterozygosity varied from 0.35 to 0.60. Genotypic frequencies generally agreed with Hardy-Weinberg expectations, apart from the German Landrace and Schwäbisch-Hällisches breeds, which showed significantly reduced heterozygosity. Breed differentiation was significant as shown by the high among-breed fixation index (overall $F_{ m ST} = 0.27$ ), and confirmed by the clustering based on the genetic distances between individuals, which grouped essentially all individuals in 11 clusters corresponding to the 11 breeds. The genetic distances between breeds were first used to construct phylogenetic trees. The trees indicated that a genetic drift model might explain the divergence of the two German breeds, but no reliable phylogeny could be inferred among the remaining breeds. The same distances were also used to measure the global diversity of the set of breeds considered, and to evaluate the marginal loss of diversity attached to each breed. In that respect, the French Basque breed appeared to be the most "unique" in the set considered. This study, which remains to be extended to a larger set of European breeds, indicates that using genetic distances between breeds of farm animals in a classical taxonomic approach may not give clear resolution, but points to their usefulness in a prospective evaluation of diversity.
    The PiGMaP consortium linkage map of the pig (Sus scrofa).
    Archibald, A.L. ; Haley, C.S. ; Brown, J.F. ; Couperwhite, S. ; McQueen, H.A. ; Nicholson, D. ; Coppieters, W. ; Weghe, A. van de; Stratil, A. ; Wintero, A.K. ; Fredholm, M. ; Larsen, N.J. ; Nielsen, V.H. ; Milan, D. ; Woloszyn, N. ; Robic, A. ; Dalens, M. ; Rioquet, J. ; Gellin, J. ; Caritez, J.C. ; Burga, G. ; Ollivier, L. ; Bidanel, J.P. ; Vaiman, M. ; Renard, C. ; Geldermann, H. ; Davoli, R. ; Ruyter, D. ; Verstege, E.J.M. - \ 1995
    Mammalian Genome 6 (1995). - ISSN 0938-8990 - p. 157 - 175.
    A linkage map of the porcine genome has been developed by segregation analysis of 239 genetic markers. Eighty-one of these markers correspond to known genes. Linkage groups have been assigned to all 18 autosomes plus the X Chromosome (Chr). As 69 of the markers on the linkage map have also been mapped physically (by others), there is significant integration of linkage and physical map data. Six informative markers failed to show linkage to these maps. As in other species, the genetic map of the heterogametic sex (male) was significantly shorter (∼16.5 Morgans) than the genetic map of the homogametic sex (female) (∼21.5 Morgans). The sex-averaged genetic map of the pig was estimated to be ∼18 Morgans in length. Mapping information for 61 Type I loci (genes) enhances the contribution of the pig gene map to comparative gene mapping. Because the linkage map incorporates both highly polymorphic Type II loci, predominantly microsatellites, and Type I loci, it will be useful both for large experiments to map quantitative trait loci and for the subsequent isolation of trait genes following a comparative and candidate gene approach
    A note on the estimation of the effective number of additive and dominant loci contributing to quantitative variation.
    Ollivier, L. ; Janss, L.L.G. - \ 1993
    Genetics 135 (1993). - ISSN 0016-6731 - p. 907 - 909.
    Pigmap: a European initiative to map the porcine genome.
    Archibald, A. ; Haley, C.S. ; Andersson, L. ; Gustavsson, I. ; Bosma, A.A. ; Davies, W. ; Fredholm, M. ; Geldermann, H. ; Gellin, J. ; Groenen, M.A.M. ; Ollivier, L. - \ 1990
    In: Proc. 22nd Int. Conf. Animal genetics, East Lansing, USA - p. 541 - 541.
    The pig gene mapping project-Pigmap.
    Haley, C.S. ; Archibald, A. ; Andersson, L. ; Bosma, A.A. ; Davies, W. ; Fredholm, M. ; Geldermann, H. ; Groenen, M.A.M. ; Gustavsson, I. ; Ollivier, L. ; Tucke, E.M. ; Weghe, A. v.d. - \ 1990
    In: Proc. 4th World Congr. Genetics applied to livestock production, Vol. 13. Edinburgh, Scotland - p. 67 - 70.
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