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現(xiàn)在人們?cè)絹?lái)越青睞有機(jī)食品，但英國(guó)一項(xiàng)研究顯示，鳥(niǎo)兒在選擇食物的時(shí)候并不偏愛(ài)有機(jī)食品，反而更喜歡吃那些施化肥種植的小麥。
英國(guó)紐卡斯?fàn)柎髮W(xué)研究人員在新一期《糧食和農(nóng)業(yè)科學(xué)雜志》上報(bào)告說(shuō)，他們進(jìn)行了為期三年的實(shí)驗(yàn)，在冬天鳥(niǎo)兒不易找到食物的時(shí)候，在幾個(gè)公園設(shè)置了幾十個(gè)喂食點(diǎn)，每個(gè)喂食點(diǎn)都有兩個(gè)相鄰且外觀相同的喂食裝置，內(nèi)裝相同品種的小麥，區(qū)別在于一個(gè)裝置里面是通過(guò)有機(jī)方式種植的小麥，而另一個(gè)裝置里面是施化肥種植的非有機(jī)小麥。
結(jié)果發(fā)現(xiàn)，鳥(niǎo)兒更喜歡吃那些非有機(jī)小麥。實(shí)驗(yàn)一段時(shí)間后，研究人員還互換了兩種小麥的位置，不過(guò)鳥(niǎo)兒很快就發(fā)現(xiàn)了這個(gè)變化，仍然更多地食用非有機(jī)小麥。此外，在實(shí)驗(yàn)室中喂養(yǎng)的金絲雀也表現(xiàn)出同樣的擇食傾向。
研究人員分析認(rèn)為，施用含氮元素的化肥后，小麥粒中的蛋白質(zhì)含量比有機(jī)小麥平均高10％，而對(duì)于在冬天不易找到食物的鳥(niǎo)兒來(lái)說(shuō)，補(bǔ)充蛋白質(zhì)非常重要。
參與這一研究的麥肯齊博士說(shuō)，研究結(jié)果表明，認(rèn)為有機(jī)食品更好的觀點(diǎn)未必總是正確，雖然這項(xiàng)研究沒(méi)有涵蓋非有機(jī)食品中化肥和農(nóng)藥殘余物的長(zhǎng)期影響等問(wèn)題，但它的確說(shuō)明非有機(jī)食品在營(yíng)養(yǎng)上也有其優(yōu)點(diǎn)。
現(xiàn)在的有機(jī)食品一般指用天然種植或飼養(yǎng)方式得到的食品，這類食品在生產(chǎn)和加工過(guò)程中嚴(yán)格遵守相關(guān)標(biāo)準(zhǔn)，禁止使用化學(xué)合成的農(nóng)藥、化肥、激素、抗生素、添加劑等。
上海勁馬生物（）推薦原文出處：
Journal of the Science of Food and Agriculture doi：10.1002/jsfa.4025
Birds select conventional over organic wheat when given free choice
Ailsa J McKenzie *, Mark J Whittingham
School of Biology, Newcastle University, Ridley Building, Claremont Road, Newcastle upon Tyne NE1 7RU, UK
BACKGROUND: Global demand for organic produce is increasing by 4 billion annually. One key reason why consumers buy organic food is because they consider it to be better for human and animal health. Reviews comparing organic and conventional food have stated that organic food is preferred by birds and mammals in choice tests.
RESULTS: This study shows the opposite result - that captive birds in the laboratory and wild garden birds both consumed more conventional than organic wheat when given free choice. There was a lag in preference formation during which time birds learnt to distinguish between the two food types, which is likely to explain why the present results differ from those of previous studies. A further experiment confirmed that, of 16 potential causal factors, detection by birds of consistently higher levels of protein in conventional seeds （a common difference between many organic and conventional foodstuffs） is the likely mechanism behind this pattern.
CONCLUSION: The results of this study suggest that the current dogma that organic food is preferred to conventional food may not always be true, which is of considerable importance for consumer perceptions of organically grown food.
