Testing is in fact a long and costly activity necessitating stable operations capable of paying for themselves. In fact the operation of testing a number of bulls does not guarantee that one or more bulls capable of bringing about an improvement will be found. Moreover this type of genetic testing, which lasts from five to ten years, costs nearly 300 000 francs per bull tested, whereas one bull in four will be approved by milk producers and one in ten will be widely used by breeders.
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