They aren't in the U.S. for fowl or pigs. Unless you count soy-based feeds, with phyto-estrogens as a natural part of soy. I was taking some "literary license" there, well, actually I was thinking in terms of chickens full of antibiotics and cattle full of growth hormones or milk-production...
I'm not a commercial poultry producer, but I am a -serious- poultry keeper. I went to an agricultural college and studied poultry science and gamebird management and other ag subjects, and at one time I might have gone into the professional end of poultry keeping or at least cooperative...
Brooder stuff... I was always very lackadaisical about brooders! Mainly because I have hens that go broody at the drop of a pin. I let my hens hatch and brood their own eggs and chicks. But when I do order chicks from a hatchery, I keep it very simple: I just hang a traditional red-light brooder...
I have Polaroid photos of my first geese and chickens from 1970. But I don't have a scanner to scan them. I have a webcam I could hold the photos to, but I'm on dial up and it would take forever for the image to upload.
When I was going to the ag college at the state university, I got...