I usually stay out of these arguments BUT this time I am going to reply, YES Robert is right in what he has printed and too much crap goes into books, leaflets, flyer's etc without proper knowledge of specific items. How many people have read books and class them as the holly bible of poultry, pigs etc, this is when mistakes are made by the reader and it always ends up being someone Else's fault, oh the book said i just done as the book says, always better leaving the blame at someone else's door