Whilst I think that your sentiments are valid - children should appreciate that meat and animal products come from animals, and that an animal has to die in order to for someone to eat meat (I personally feel that not enough adults are aware as they should be about this, given the sanitised way in which we eat and buy meat these days) - I can't help feel that taking children to an abbatoir is a little provocative. It's one thing to explain that a cow has to be killed in order to provide us with a burger; it's quite another to enforce a child to watch one having a bolt put through its brain and being decapitated. It certainly raises questions about our society, where such things are considered as horrific and distasteful (where other cultures view killing animals as a natural aspect of life), but I don't feel it's our role as teachers to change this societal view. Most, if not all children would find this deeply upsetting, and it's not our position to use such tactics to provoke or stimulate thought. Another more practical point to consider is where this would be shoehorned into the NC, given the learning focus needed for educational trips.