Hormones are illegal for use in poultry and pork. (
http://www.fsis.usda.gov/Fact_Sheets/Duck_&_Goose_from_Farm_to_Table/index.asp and
http://www.fsis.usda.gov/oa/pubs/pork.htm) Antibiotics may only be used to treat disease or prevent disease (if transmissible), and any animal which has had antibiotics must be held for a withdrawal period after the last day of administration. This withdrawal period is dictated by law. It is based on the rate that antibiotics are metabolized out of the body.
Economically, the reality is that chickens rarely get antibiotics. They go to slaughter when they're 7 weeks old and if the chicks are quarantined before introduction to the chicken house (as is usual) disease doesn't usually take hold. In most cases, it's cheaper to just pull the sick bird (if it can be caught quick enough) and destroy it. Five gallons of Cipro may cost as much as the house full of day old chicks did. Chickens that are not allowed outside are not likely to contract diseases from wild birds. And organic chickens may be given antibiotics in case of disease outbreak - they're just not allowed to have feed that is less than 80% organic. Laying hens may not be given antibiotics or hormones. Laying hens that get sick must be pulled out of the production line.
A single sick bird in a flock can mean the difference between breaking even and a loss; thus sick birds are pulled out. The big problem with chicken is environmental (what do you do with the waste, which is high in ammonia and arsenic), labor (the farmers are pretty heavily exploited by the big companies) and industrial (injury rates at poultry packing plants are some of the worst in all fields). Poultry waste is also nasty for campylobacter and salmonella.
Chickens tend to bioacumulate arsenic that occurs naturally in water and soil, and most of the chicken consumed in the US comes from areas that test high for arsenic. Most "organic" chicken comes from California, rather than the Gulf Coast and southern Midwest; California does not have the naturally occurring arsenic that much of the Mississippi valley and Great Lakes region has. (Due to the differences in tectonic plates, if I remember my geology courses correctly.)
"Free range" or "natural" or "Roaming" doesn't mean anything. They're not USDA regulated labels. The first and last merely mean that the chicken house door was left open, and natural means no colors, additives or preservatives were added. Organic only applies to feed (and only 80% of the feed must be organic). In fact, raising chickens indoors, in dim light, in raised cages is better for the chickens - they're less likely to cannibalize each other, less likely to peck each other, and less likely to contract respiratory disease caused by contact with their own droppings and the ammonia it contains. I eat chickens out of a sense of revenge - they're mean if they're not kept in semi-dark (so they stay sleepy). Ducks make better pets; geese make excellent watch dogs. (As it happens, all poultry laws apply to all birds, including turkeys, Cornish rock hens, squab and farm raised pheasant.) But chickens have the personality of mean drunks on the morning after a big binge.
As for the big three of chicken, Perdue, Tyson and Foster Farms all quit putting antibiotics in feed by 2002, and even then was only used when other management strategies failed. (Citation: USDA regulations, supermarketguru.com, Time). There is a 7 day withdrawal period for poultry from last day of administration. Hormones have not been used since the 50s when they were banned for all poultry production. Chickens are bred for size, but not goosed into size by hormone supplements. (FSIS-USDA, Foster Farms, Perdue, Tyson, www.eco-labels.org)
As for pork, hogs may only receive antibiotics to treat or prevent a disease, and the withdrawal period between last date of administration and sale for slaughter is 6 weeks in shoats, 8 weeks in mature hogs. All antibiotics are metabolized out of the body within that period of time. Any animal found upon inspection to carry antibiotic residue is removed from the human consumption line.
No hormones are allowed in the raising of hogs. None. Period. That's USDA reg. (Food Safety and Inspection Service of the USDA.) Because they're social, omnivorous creatures, putting them on the same type of free range as free range cattle would kill them - either they would kill the weakest members of the group or they would starve without access to a balanced diet. There's a reason pigs have traditionally been fed slops - that's what they do best on. (Our pigs get a diet that is about 25% our corn and 25% our soy, and 50% comes from the food waste generated by the local Mennonite school in Indiana - which is their own, organic food.) The problem with commercially raised hogs is again, waste and labor, though hog slaughtering is, on par, safer than either beef or chicken. The other problem is traditional, not current, and that is trichinosis. The last outbreak in the United States was in 1990, and was traced back to a Mhong wedding and pigs that were not factory farmed, but hand-raised. There have also been outbreaks related to bear meat, but since that's not commercially available, it's really not a factor.
I have to know these regs - I drew the short straw when the family trust management changed after my great-grandfather's death - we are an organic farm and we raise hogs, some chickens (for local consumption), organic soy and organic corn. (Somebody in the family had to learn the laws when my cousin opted out.) The links I gave you above are the consumer links - the real regs are about a 13 inch stack of single spaced, 8x11 print out and they change every year. But hormones and antibiotics don't change. The producers don't want it to change - it would drive up costs.
We raise about 400 hogs, 300 chickens and 3500 acres of hay, corn, soy and truck (crop rotation.) Everything save the truck is sold through the co-op. We're organic because my great-grandfather was too cheap to use chemicals when "fertilizer falls out of the cow's fanny." However, our neighbors are standard; their methods vary not all that much from ours, except they use Round-up on their beans and corn, and they get a lower price for their pork bellies. (Our neighbors are third cousins, twice removed by marriage... or something like that. I'm related to half the state.) We don't raise beef anymore at all - it's just too expensive for the return. A pound of pork costs us 4 pounds of feed, a pound of whole chicken costs about 2.5 pounds of feed, but even a pound of grass-fed beef costs about 16 pounds of hay and feed. With our acreage, we can't afford them.
The sad part is that the morality vegetarians have lied to us when it comes to how meat is managed. Even Consumer Reports can't be trusted on this - you have to go straight to the regs. Cute pictures of chickens chasing bugs in a grassy meadow are marketing; there is no way to even break even if you're raising more than for your own family's consumption due to the waste handling measures that we have to follow. If you sell more than 45 birds or 24 hogs a year, you are subject to USDA regulation whether you're organic or not.
As for beef... my husband grew up on a dairy farm, and one of the Horizon organic dairies is within 20 miles of my house. Happy Cows is not exactly accurate... but the cows out in Matheson, where Lasater is located, are (or, at least they're as happy as any cow I've ever met).