Hi Cinderhills,
It could just be that they are really heavy milkers. What were their pens like? Did they have hay available? Grass and or branches? Did they have bowls of concentrated food or Alfalfa? You should be able to tell from what is around their pen how well looked after they are. I can assure you I know several people who are showing their goats at the Yorkshire, and if they were mistreated, it would have been reported to the RSPCA by now.
And Roxy is correct in what she says, it would be odd to enter poor quality or thin goats to a big show like that.
I have to say, I was supposed to be showing their this year, and couldn't get because my colleague at work had to have time off to move house. Part of me was quite glad though on seeing the rain there has been this week.
Beth