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Animals avoid GM food
On 18 Aug 2003 10:49:56 GMT, Brian Sandle
posted: Jim Webster wrote: "Brian Sandle" wrote in message Then how about milk differences between grass-silage and corn-silage fed cows? Taste and keeping/nutritional qualities? by the time milk has been pasturised, homogenised, standardised, you haven't a cat in hells chance of telling. Bigger difference between grass and silage, spring and winter than there is between various winter feeds. Remember that the nutrition of a high yielding dairy cow is a serious matter and carefully monitored. Linkname: Rapport-skabelon URL: http://www.agrsci.dk/ark/ARK-arsberetning2002_uk.shtml size: 213 lines [...] Over the last couple of years maize has become increasingly popular in the Danish silage production at the expense of grass because of a better profitability. Therefore studies have been initiated to investigate what consequences it has on different quality parameters of milk to feed dairy cows maize silage instead of grass silage. Milk from cows in an experiment with two groups of cows fed maize and grass silage, respectively, in a cross-over experimental design for 2 x 4 weeks was subsequently analysed for: * fatty acid composition * content of carotenoids * content of vitamin E Furthermore, we have analysed sensory characteristics in fresh and stored milk from the cows fed maize and grass silage, respectively. The results of these investigations show, that feeding with maize silage reduces the amount of the polyunsaturated fatty acid linolenic acid in the milk, and at the same time the content of vitamin E and beta-carotene is reduced with approximately 50% and 62%, respectively, compared to milk from cows fed grass silage. Both vitamin E and beta-carotene are important antioxidants that preserve the freshness of milk, and therefore it should be assumed that a great reduction of these antioxidants will reduce the shelf-life of milk as well as other dairy products considerably. The sensory analyses of the milk showed a significant difference between the taste of milk from cows fed maize silage compared with the milk from cows fed grass silage. Thus, the sensory panel described the milk from cows fed maize silage as creamy, sweet and tasting like corn flakes, which are all perceived as positive descriptors, whereas the panel used descriptors about the milk from cows fed grass silage that usually associate with negative tastes. [...] And other studies give grass-silage-fed cows as giving milk higher in the cancer-protective conjugated linolenic acid, and other matters. This is in many many foods. I used to notice the varying tastes in milk when I used it (pasteurised). Blindfolded? A few years ago I noted that full cream non-homogenised bottled milk had started to have its top milk turned to butter by the time it was delivered. In earlier years it was possible to pour off the top milk. Perhaps corn feeding was increasing here? And perhaps the bottles were jiggled more in transport. Or a different breed of cow. But my point is that if you don't notice any of those differences then perhaps your perceptivity might not be trusted as to differences between cows reactions to GM vs non-GM feed. Hooley Dooley. Show us the scientific evidence. |
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