Comparison of nutritional quality between conventional and organic dairy products: A meta-analysis

Article (PDF Available)inJournal of the Science of Food and Agriculture 92(14):2774-81 · November 2012with333 Reads
DOI: 10.1002/jsfa.5639 · Source: PubMed
Abstract
As a contribution to the debate on the comparison of nutritional quality between conventional versus organic products, the present study would like to provide new results on this issue specifically on dairy products by integrating the last 3 years' studies using a meta-analysis approach with Hedges' d effect size method. The current meta-analysis shows that organic dairy products contain significantly higher protein, ALA, total omega-3 fatty acid, cis-9,trans-11 conjugated linoleic acid, trans-11 vaccenic acid, eicosapentanoic acid, and docosapentanoic acid than those of conventional types, with cumulative effect size ( ± 95% confidence interval) of 0.56 ± 0.24, 1.74 ± 0.16, 0.84 ± 0.14, 0.68 ± 0.13, 0.51 ± 0.16, 0.42 ± 0.23, and 0.71 ± 0.3, respectively. It is also observed that organic dairy products have significantly (P < 0.001) higher omega-3 to -6 ratio (0.42 vs. 0.23) and Δ9-desaturase index (0.28 vs. 0.27) than the conventional types. The current regulation on organic farming indeed drives organic farms to production of organic dairy products with different nutritional qualities from conventional ones. The differences in feeding regime between conventional and organic dairy production is suspected as the reason behind this evidence. Further identical meta-analysis may be best applicable for summarizing a comparison between conventional and organic foodstuffs for other aspects and food categories. Copyright © 2012 Society of Chemical Industry.

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    • "Elevated Cd is associated with contamination of mineral-based fertilizers such as KCl. Palupi et al. (2012) limit their attention to animal products for which more consistent differences are seen for animals produced on grass (required for organic certification). Further five review articles concluded that the evidence was insufficient to draw firm conclusions (Brandt and Mølgaard, 2001; Bourn and Prescott, 2002; Magkos et al., 2006; Winter and Davis, 2006; Johansson et al., 2014). "
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    • "This could attract a wider group of consumers. To use such benefit claims, further research might be needed to evidence the link between animal welfare and other product benefits, such as for example indications of a positive relationship between animal welfare and milk quality (Müller-Lindenlauf et al., 2010) or a higher nutritional quality in products that originate from organic dairy farms (Palupi et al., 2012). In contrast to attitudes and perceptions, intention to purchase animal-friendly milk was neither significantly related to socio-demographic factors (such as sex and age) nor to behavioral characteristics (such as frequency and type of milk consumed) when analyzed in a multivariate setting together with attitudinal factors. "
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    • "Therefore, specifically for a developing country like Bangladesh, organic farming holds environmental promises. Many previous studies found organic foods to be more nutritious than genetically modified (GM) foods (Palupi, Jayanegara, Ploeger, & Kahl, 2012). Some authors specifically confirmed the nutritional superiority of plant-based organic foods when compared with genetically modified plant-based foods (Benbrook et al., 2008). "
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