Its harder to get a cow fat on just grass. Around here we have to supplement their feed. The native grasses do not have sufficient protein - when we began this experiment, we discovered to our surprise, that you can starve a cow on native grasses that are knee deep.
We feed a mineral/molasses mix. Molasses is syrup made from sugar cane - its not weird.
We do NOT add hormones or antibiotics to speed up the growth of the animals.
And we have disced and seeded the pasture with bermuda. Bermuda grass has a higher protein content.
We also feed 10% sweet - which is a mix made for horses. Primarily just to keep the animals tame. Most of my critters are actually excessively tame. They think I'm a runty cow - and don't hesitate to treat me like one - pushing me out of their way.
I don't have the weight to push back - although I'm meaner and have been aggressive when they threaten my toes.
You can buy "grass fed" beef at the whole foods/organic foods markets. Its more expensive, because it takes longer to have a harvestable animal. And the label doesn't mean that all they eat is grass - just that grass is the dominant portion of their diet.
Its typically leaner beef - so you have to learn to cook it. Can't just throw it on the grill like stockyard raised Angus.
A typical South Texas calf is harvested at 18 months. We keep ours until 22 months or older. Our animals aren't bigger than harvest calves - we just enjoy them longer.
They are pets until the day that they are harvested.
Like huge dumb dogs.
Cows are something like I imagine autistic children would be. Very smart about food. Very dumb about just about other things.
They know their names, and come when the food bucket is rattled.
This bull, Lucas, pretty much stays home. The bull we had before, Mo, was a lady's man - he wouldn't stay in the fences.
We had a couple of paternity claims... And had to retrieve him in the middle of the night one time, when a friend reported him wandering down the road.
Lucas goes in the freezer next year. You can't keep a bull more than a couple of years, or they start looking at their daughters. Joline and Pink are his kids. We may keep Joline.
Genetically, he's produced beautiful babies, but he has horns. Horns are not desirable in a small farm, like ours. And he's not as tame as I would like.
Of course, we only have Mo to compare him with. And Mo was extremely easy to handle.