We are often asked how it is possible to raise quality beef on grass without heavily concentrated rations of processed grain. The short answer, without digging into the science: ruminants were designed to get nearly everything they need from grasses and legumes. The higher the quality of the forage, the better the beef and the faster the animal grows.
The beef
Start with the digestive system. Unlike humans, ruminants do not digest food with enzymes and emulsifying agents. Digestion is carried out by bacteria in the rumen — a large fermentation vat that in a full-grown cow can hold up to 250 pounds of slurry at a time. The science of feeding a cow is really the science of feeding and maintaining healthy bacteria. The cow provides the feed and a warm vat; chewing cud creates more surface area so the bacteria can work faster and more completely. Those bacteria break proteins into amino acids and carbohydrates into starches and simple sugars the animal absorbs for maintenance and growth.
That fact — that feeding a cow is really feeding bacteria — was a gift to the industrial beef system. It became far cheaper to raise beef in confinement on rations manufactured from the discards of other industries. As long as the bacteria get the carbohydrates and protein they need, they adapt. Feedlots also removed the need to let animals roam wide-open spaces at the mercy of the weather, burning calories a producer would rather turn into profit.
That approach has produced real health and quality problems, for the cattle and for the people eating them. The healthiest rumens, the healthiest cattle, and the best beef still come from the original source: grass.
The grass
Simple as it sounds, good grass-fed beef takes management. You cannot turn a steer out in spring, round him up in fall, and expect anything better than shoe leather.
Americans have clear expectations for tenderness. Feedlot beef is usually tender if nothing else, and that is the standard most people know. Grazing animals use their muscles constantly, so texture variation is a genuine concern — one of the real challenges in raising good grass-fed beef.
Here in the Northeast, grasses have a short but aggressive growing season. Even on poor land, May growth is explosive, and any beef animal is in its glory that month. Management gets harder as summer develops. By late June the sun is more intense, moisture is uncertain, and plants are trying to mature. A mature grass or legume is not what you want: as a plant matures its sugar and protein content fall sharply while fiber and lignin rise. Fiber does not hurt the cow, but too much dilutes the nutrient concentration in the rumen and growth slows.
Plants grow with one purpose — to set seed. When a grazing cow eats the top half, the plant pushes skyward again. That is the engine of rotational grazing. In the first week of June we mow each pasture immediately after the cattle have grazed it and moved on, which resets every plant in that paddock to the same stage. After a couple of weeks of rest, the paddock regenerates into lush growth. Mowing also sets back the undesirable weeds and keeps them from reproducing. Moving cattle paddock to paddock, giving each two to four weeks of rest depending on weather, gets the most from the land and gives the cattle continuous fresh forage.
Species diversity matters as much as rotation. In late spring the cool-season grasses — orchard grass, canary grass — dominate and mature quickly. By midsummer, heat and longer days slow or stop them, and the deeper-rooted legumes like clover and alfalfa take over. Fescues hold nutritional value later into the heat with better drought tolerance. A diverse pasture sustains quality forage across the whole season. As for weeds: thistle and burdock can be controlled by mowing, but many weeds are palatable and nutritious, and they are part of the ecosystem. The most suitable plants survive; grazing pressure can be adjusted to encourage or discourage a given species.
The soil
As the grass feeds the beef, so the soil feeds the grass. People sometimes get anxious when fertilizer comes up. With the exception of urea (nitrogen), most fertilizers are simply minerals mined from the earth and returned to the soil to feed plant life.
Consider the arithmetic. A grazing season removes tons of nutrient-dense beef from the land every year. Done year after year without replenishment, the ground would go barren, and the growth and well-being of the animals would suffer. Manure, urine, and dead plant matter build humus and soil texture, but they do not manufacture major nutrients. Nitrogen is the one macronutrient that can be fixed naturally, and only legumes do it. The nutrients from this farm end up in your freezer each fall. Timing and quantity require care, but replenishment is a necessary part of the cycle.
All the fertilizer in the world is useless if the plants cannot take it up. If soil pH is too acidic or too basic, nutrients stay locked away. pH is the first thing to address. Some grasses survive around pH 6.0, but legumes want 6.5 or a little higher. Northeastern soils tend to be acidic and usually need an amendment — typically ground limestone. Wood ash also raises pH and supplies natural potassium. Once pH is right, everything grows more vigorously and stands up better to stress like drought.
The Champlain Valley has unusual characteristics. The weather here is far milder than the rest of Vermont — on a national climate map, a long sliver on the west side of the state pairs with southern New York and northern Pennsylvania. Trees and plants thrive here that are not seen anywhere else in Vermont.
Our soils are different too: heavy clay and clay loams. Clay is difficult to work. Dry, it is as hard as concrete; wet, it is sticky grease. Any tillage must happen in the narrow window when the soil crumbles but does not stick. In a Georgia climate our agriculture would suffer badly — the top layer would bake and shed water. Winter is our friend here. After the ground soaks up the fall rains it freezes hard, and the spring thaw works like a mortar and pestle, breaking the clay particles apart so water settles in and roots push down. For all its difficulty, clay is very fertile: it is dense enough that nutrients leach slowly and pH shifts gradually compared with sand, silt, or the lighter topsoils of the Midwest.
Like everything else, this takes experience to monitor and manage. Nature does much of the work and creates most of the problems. The hardest discipline is accepting what you cannot control. You can control pH, soil fertility, and which field the cattle are in today. You cannot control sun, wind, rain, or temperature. So you plan for the worst case — so that you, the customer, are not disappointed when your beef arrives in the fall.