You are the one hung up on the term "grass fed" I stated mine are NOT "feed lot " lambs. Ive shown you several sources to explain the difference.
You said: "Maybe in your area grain is considered grass?"
To say "grain is not natural" is lame since grain GROWS ON GRASS. Rye, barley, wheat , oats, buckwheat. They are all both GRASS and GRAINS. So the truly NATURAL feed is for them to eat both, along with various BROWSE such as tree leaves and vines. You can limit yours to grass alone, but you shouldnt try to say its more "natural". since given a free choice sheep will eat many different things
You also stated: "As far as the worm cycle, I don't have the time to explain about details. I suggest studying the benefits of management intensive rotational grazing."
http://www.sheepandgoat.com/articles/grassfed.html
"Internal parasites are a much greater problem with grazing animals than those being fed in confinement. This is particularly true when grazing small ruminants which may require frequent deworming or handling to monitor parasite levels. While grazing animals are much less prone to enterotoxemia (overeating disease), urinary calculi, and other metabolic disorders, grazing poses its own set of health risks: poisonous plants, bloat, grass tetany, and fescue toxicosis -- not to mention predators"
"Grain feeding tends to improve rate of gain and parasite tolerance in small ruminants. Giving lambs and/or kids a little bit of grain each day gives the producer a chance to more easily monitor the health and condition of his animals. Grain can be a very economical source of nutrients for growing lambs and kids. Grain-fed lambs and kids usually bring a higher price at auctions because they tend to carry a higher degree of body condition. Yet feeding a little bit of grain on pasture is significantly different from confining livetsock to a feed lot and feeding them limitless grain."
There are no "details" you can explain that will change the fact that 30 days off a pasture has NO real effect on the worm loads, or that GRASS FED sheep will have MORE worm problems than "feedlot " sheep.
You may have people willing to pay more for "grass fed" lambs. Those same people will pay more for a "free range" chicken that may never actually leave it's pen in its lifetime. Its a marketing gimmick. When actual RESULTS are compared, this is what they say:
"Grain-feeding alone or supplementing grain on pasture produces lamb with a milder, more desirable flavor. Grain-fed lamb and beef has generally been preferred in taste panel tests in the U.S., though grass-fed lamb is preferred in the United Kingdom. Grass-fed lamb tends to have more off flavors and is more subject to oxidation, which affects shelf life and color"
They are your sheep so if you want to limit them to an UNNATURAL diet of only grass, its fine with me. Around here, my customers want BIG lambs, and a little grain gets them that way in about 3 months less, and is TOTALLY "natural" By weaning earlier, I can rebreed sooner and produce MORE, BIGGER lambs in less time.
This lamb was born on 12-2-07 and the pic taken on 1-24 -07 standing beside his Mom. You wont get results like this on grass alone