No, you will get closer to 60% meat from a sheep. These were very sad looking sheep; short, thin and did not do very well which is why they never were sold and why I slaughtered them, I just did not want them in my flock.
I love raising sheep even though I grew up with beef and dairy cows primarily. I like their size for one, which can be intimidating with 2000 pound cows. And I like lambing season, but mostly it is because of economic factors. The price of lamb is higher then other meats, you only have to raise them from Spring until fall to get a nice finished lamb (so you only have to winter feed your breeding stock), and they are incredibly hardy. As long as they have roughage and water, and are out of the wind, they can survive in temps as low as -40 below zero, so barn facilities can be quite meager. You also get more hang weight per acre then any other animal, and unlike cows that prefer grass to graze on, sheep love weeds. In fact their favorite food is poison ivy. With their wool, it does not bother them and I have mob grazed acres of the stuff out of my old pastures here. The only weeds they do not like are milkweed and thistle...they even tolerate smooth bedstraw quite well.
But there are issues with sheep too. Lambing can be tough, and I have dealt with overeating disease and foot rot. The latter did not kill my sheep, but it was a time-suck to deal with. Overeating disease killed 40 of my best lambs one year but now found a vaccine that stops it. Bloat killed 17 breeding stock sheep in one night, so every time I learn something about sheep, it comes from the price of having dead sheep.
Fencing is expensive too, but a must. Electricity and sheep in wool do not jive which means Page Wire Fence is a must and is very expensive. I only have 15 acres of wire up because that cost $20,000 dollars. I free range the rest, but I do worry about coyotes. Myself, and my Grandfather have never lost a sheep (yet) to coyotes, but they are nearby and so even when I free range my sheep on the upper most fields, I lead them into a fence with wire every night for their safety.
(I did try an experiment of running my sheep with a bull thinking it would act as a deterrent from sheer size alone, but it did not turn out well. Without electricity on my fence, the bull would tear apart my sheep fence and had to be put down, that being a $750 dollar animal was not worth losing $20,000 worth of fence for. But I have tried using a Pony as a guard animal with some success...again the size of it being a deterrent more then anything...and a donkey, but the donkey was more harmful to the sheep then the coyotes. I guess that is fitting, the donkey's name was Obama after all.
Overall though, I will never be without sheep. Partly because we have always had them. There is no record of sheep being on the Mayflower, but three years later records show someone traded sheep for some land, so they were here quite early. My Great Grandfather 14 times removed who came over on the Mayflower was a Tailor by trade, so it makes sense that upon finding out how cold New England is, imported sheep pretty quickly just for their wool. We do have records showing that he was the first sheep shearer in New England, and had the first sheep shearing shed, so being a 14th generation sheep farmer, I am pretty biased about sheep. The other aspect is, being a Christian, raising sheep really makes the bible come alive because there are so many references to sheep.
But atlas I was really kicked in the teeth this week. I already have 3 girls so I was hoping the baby I have coming in May would be a boy, and be a 15th Generation Sheep Farmer, but we found out we are having our 4th girl. I know we have no right to be sad, but the wife and I were so hoping for a boy that it brought tears to our eyes.