The article which refers to 'Super Cows' is available here
There is a more interesting possible trade-off between productivity and safety. The question is whether consumers want more productivity, from agriculture and the food system, as this may lead to less food safety.
BSE could have been caused, ultimately, by trying to make livestock more productive. The aim would be to produce more meat or milk. One of the main problems here is that the public was hardly involved in the decision-making to intensify agriculture. This is because agriculture would have barely featured in UK election debates. The public seemed to have little control over research experiments on farm animals.
The possible introduction of GM Food, in the United Kingdom, with the aim of making the food system more productive could come at the expense of safety. In 2011, this remains to be seen.
Intensive farming, including the development of super dairy cows, has been criticized for the inadequate livestock conditions. It is possible that poor animal welfare could lead to food safety problems later on.