About 3 years ago the Cooks had a new concrete floor laid in their dairy and learnt very quickly that it was far too smooth causing their dairy cows to slip. Over the next 2 years they lost 6 milking cows which was both upsetting and costly each valued at $1,500. Combined with the loss of milk production of $3,000 per head (6,000 litres p.a. x $0.50 per litre) the Cooks valued this at a total herd loss of $27,000 for the 2 years (not including lost future lactations).