2Hoogenboom, LAP, Bokhorst, JG, Northolt, MD, et al. (2008) Contaminants and micro organisms in Dutch organic food products: a comparison with conventional products. Food Addit Contam 10, 1195–1207.
3Cooper, J, Leifert, C & Niggli, U (editors) (2007) Handbook of Organic Food Safety and Quality. Cambridge: Woodhead Publishing Limited.
4Brandt, K (2007) .
5AFSSA (2003) .
6Worthington, V (2001) Nutritional quality of organic versus conventional fruits, vegetables, and grains. J Altern Complement Med 7, 161–173.
7Woese, K, Lange, D, Boess, C, et al. (1997) A comparison of organically and conventionally grown foods – results of a review of the relevant literature. J Sci Food Agric 74, 281–293.
8Chassy, AW, Bui, L, Renoud, ENC, et al. (2006) Three-year comparison of the content of antioxidant microconstituents and several quality characteristics in organic and conventionally managed tomatoes and bell peppers. J Agric Food Chem 54, 8244–8252.
9Jørgensen, H, Brandt, K & Lauridsen, C (2008) Year rather than farming system influences protein utilization and energy value of vegetables when measured in a rat model. Nutr Res. 28, 866–878.
11Noverr, MC & Huffnagle, GB (2004) Does the microbiota regulate immune responses outside the gut? Trends Microbiol 12, 562–568.
12Klasing, KC (1998) Nutritional modulation of resistance to infectious diseases. Poult Sci 8, 1119–1125.
13Scrimshaw, NS & SanGiovanni, JP (1997) Synergism of nutrition, infection and immunity: an overview. Am J Clin Nutr 66, 464S–477S.
14Finamore, A, Britti, MS, Roselli, M, et al. (2004) Novel approach for food safety evaluation. Results of a pilot experiment to evaluate organic and conventional foods. J Agric Food Chem 52, 7425–7431.
15Lauridsen, C, Yong, C, Halekoh, U, et al. (2007) Rats show differences in some biomarkers of health when eating diets based on ingredients produced with three different cultivation strategies. J Sci Food Agric 88, 720–732.
16Baumgarth, N, Tung, JW & Herzenberg, L (2005) Inherent specificities in natural antibodies: a key to immune defense against pathogen invasion. Springer Semin Immunopathol 26, 347–362.
17Kreukniet, MB & Van der Zijpp, AJ (1992) Effects of immunization, adjuvant and unrelated antigens on the humoral immune response in lines of chickens selected for antibody production against sheep erythrocytes. Vet Immunol Immunopathol 33, 115–127.
18Parmentier, HK & Nieuwland, MGB (1996) Divergent antibody responses to vaccines and divergent body weights of chicken lines selected for high and low humoral responsiveness to sheep red blood cells. Avian Diseases 40, 634–644.
19Parmentier, HK, Lammers, A, Hoekman, JJ, et al. (2004) Different levels of natural antibodies in chickens divergently selected for specific antibody responses. Dev Comp Immunol 28, 39–49.
20Symonds, ME, Stephenson, T, Gardner, DS, et al. (2007) Long-term effects of nutritional programming of the embryo and fetus: mechanisms and critical windows. Reprod Fert Dev 19, 53–63.
21Demmelmair, H, Von Rosen, J & Koletzko, B (2006) Long-term consequences of early nutrition. Early Hum Dev 82, 567–574.
24Schoorl, N (1929) Suiker titratie (Suiker titration). Chem Weekblad 5, 130–134.
25Schram, E, Dustin, JP, Moore, EJ, et al. (1953) Application de la chromatographie sur échangeur d'ions a l'étude de la composition des aliments en acides amines (Application of chromatography on ion exchange to the study of food composition in amino acids). Anal Chim Acta 9, 149–162.
26Slump, P & Schreuder, HAW (1969) Determination of tryptophan in foods. Anal Biochem 27, 182–186.
27Fragner, J (1965) Vitamine und Biochemie, Band I (Vitamins and Biochemistry, Band I). Jena: Gustav Fisher Verlag pp. 273.
28Williams, S (1984) . In Official Methods of Analysis of the Association of Official Analytical Chemists, 14th ed., pp. 862–873. Arlington, VA: AOAC, Inc..
29Ploegaert, TCW, De Vries Reilingh, G, Nieuwland, MGB, et al. (2007) Intratracheally administered pathogen associated molecular patterns affect antibody responses of poultry. Poult Sci 86, 1667–1676.
30Parmentier, HK, Baelmans, R, Savelkoul, HFJ, et al. (2004) Serum haemolytic complement activities in 11 different MHC (B) typed chicken lines. Vet Immunol Immunopathol 100, 25–32.
31Parmentier, HK, Siemonsma, R & Nieuwland, MGB (1994) Immune responses to BSA in chickens divergently selected for antibody responses to SRBC. Poult Sci 73, 825–835.
32Koek, MM, Muilwijk, B, Van der Werf, MJ, et al. (2006) Microbial metabolomics with gas chromatography/mass spectrometry. Anal Chem 78, 1272–1281.
33Verhoeckx, KC, Bijlsma, S, Jespersen, S, et al. (2004) Characterization of anti-inflammatory compounds using transcriptomics, proteomics, and metabolomics in combination with multivariate data analysis. Int Immunopharmacol 4, 1499–1514.
34Bobeldijk, I, Hekman, M & De Vries-van der Weij, J (2008) Quantitative profiling of bile acids in biofluids and tissues based on accurate mass high resolution LC-FT-MS: compound class targeting in a metabolomics workflow. J Chromatogr B 871, 306–313.
35Van Hemert, S, Hoekman, AJ, Smits, MA, et al. (2004) Differences in intestinal gene expression profiles in broiler lines varying in susceptibility to malabsorption syndrome. Poult Sci 83, 1675–1682.
36Dunn, OJ & Clark, VA (1974) Applied Statistics – Analysis of Variance and Regression. New York: Wiley.
37Kreyszig, E, . Introductory Mathematical Statistics. New York: Wiley.
38Hollander, M & Wolfe, DA (1973) Nonparametric Statistical Methods. New York: Wiley.
39Krzanowski, WJ (1988) Principles of Multivariate Analysis. Oxford: Oxford University Press.
40Fisher, RA (1936) The use of multiple measurements on taxonomic problems. Ann Eugen 7, 179–188.
41Barker, M & Rayens, W (2003) Partial least squares for discrimination. J Chemometrics 17, 166–173.
42Wold, H (1982) . In Systems Under Indirect Observation. Part II, pp. 1–54 [Jöreskog, KG and Wold, H, editors]. Amsterdam: North Holland Publishing.
43De Greeff, A, Huber, M, Van de Vijver, L, et al. . (2009) Effect of organically and conventionally produced diets on jejunal gene expression in chickens. B J Nutr . doi:10.1017/S0007114509992273.
44Harker, FR (2004) Organic food claims cannot be substantiated through testing of samples intercepted in the marketplace: a horticulturalist's opinion. Food Qual Prefer 1, 91–95.
45Lorenza, RE & Bernardo, R (2008) Genetic correlation between corn performance in organic and conventional production systems. Crop Sci 48, 903–910.
46Zhao-Hui, W, Sheng-Xiu, L & Sukhdev, M (2008) Effects of fertilization and other agronomic measures on nutritional quality of crops. J Sci Food Agric 88, 7–23.
47Przystalski, M, Osman, A, Thiemt, E, et al. (2008) Comparing the performance of cereal varieties in organic and non-organic cropping systems in different European countries. Euphytica 163, 417–433.
48Murphy, K, Campbell, KG, Lyon, S, et al. (2007) Evidence for varietal adaptation to organic farming systems. Field Crops Res 102, 172–177.
49Lammerts van Bueren, ET, Struik, PC & Jacobsen, E (2002) Ecological concepts in organic farming and their consequences foe an organic crop ideotype. Nether J Agric Sci 50, 1–26.
50Davis, TF (2003) .
51Eits, RM, Kwakkel, RP, Verstegen, MWA, et al. (2003) Responses of broiler chickens to dietary protein: effects of early life protein nutrition on later responses. Br Poult Sci 44, 398–409.
52Kwakkel, RP (1994) .
53Khovidhunkit, W, Kim, MS, Memon, RA, et al. (2004) Effects of infection and inflammation on lipid and lipoprotein metabolism: mechanisms and consequences to the host. Review. J Lipid Res 45, 69–96.
54Six, DA & Dennis, EA (2000) The expanding superfamily of phospholipase A(2) enzymes: classification and characterization. Biochim Biophys Acta 1488, 1–19.
55Kapsenberg, ML (2003) Dendritic-cell control of pathogen-driven T-cell polarization. Nat Rev Immunol 3, 984–993.
56Parmentier, HK, Bronkhorst, S, Nieuwland, MGB, et al. (2002) Increased fat deposition after repeated immunization in growing chickens. Poult Sci 81, 1308–1316.
57Klasing, KC & Korver, DR (1997) Leukocytic cytokines regulate growth rate and composition following activation of the immune system. J Anim Sci 75, 58–67.
58Demas, GE, Chefer, V, Talan, MI, et al. (1997) Metabolomic costs of mounting an antigen-stimulated immune response in adult and aged C57BL/6J mice. Am J Physiol 5, 1631–1637.
59Gruys, E, Toussaint, MJM, Niewold, TA, et al. (2005) Acute phase reaction and acute phase protein. Review. J Zhejiang Univ Sci B 6, 1045–1056.
60Adamkin, DH (2008) Nutritional rehabilitation for brain-injured infants: catch-up growth is good. Pediatrics 121, 181–182.
61Rivkees, SA (2007) Continued catch-up growth in neonatal endocrinology. J Pediatr Endocrinol Metab 20, 357–358.
62Kummeling, I, Thijs, C, Huber, M, et al. (2008) Consumption of organic foods and risk of atopic disease during the first 2 years of life in the Netherlands. Br J Nutr 99, 598–605.