THE GENETICS OF QUALITY BEEF: How Do We Raise 100% Grass-fed Beef with Exceptional Marbling

Many people assume great marbling only comes from grain-finished cattle. But the truth is, you can achieve excellent marbling with grass-fed and grass-finished beef—it just takes more intention. It not only requires careful attention to the quality of the grass the cattle are finished with but, perhaps even more importantly, to the genetics behind the herd.

A DIFFERENT APPROACH

In ranching, genetics aren’t a secret — everyone pays attention to them. But at Hynson Springs M Ranch we do have a slightly different approach to what we prioritize. While breed gets a lot of attention, the truth is that many breeds (and crossbreeds) can produce highly marbled beef. What matters more to us are the specific genetic traits within those animals. 

If you want to understand how genetics play a crucial role in the beef you consume from our ranch, read on and learn what breeds of cattle we have strategically introduced in our herd in the past and what traits we look for in our bulls. 

ANGUS CATTLE AND A FEW OTHER TRAITS

For over 20 years, we’ve primarily run Angus cattle. In fact, we’ve used bulls from 44 Farms for much of that time because their Angus marbling genetics are widely regarded as some of the best in the world.

Over the years, we’ve strategically introduced a few other traits into our herd:

• Holstein influence (for 2–3 years) to improve milk production and add a little frame size to the Angus. Better milk production means faster-growing, healthier calves. (That’s why you may still see a few white splotches out in the pasture.)
• Brangus influence (about 6 years ago) to strengthen maternal instincts. Angus originated in Scotland where large predators weren’t common, so we wanted to ensure strong protective instincts in our cows without losing the Angus qualities. The Brahman influence helped with that — and yes, our heifers will absolutely chase off coyotes and stray dogs.

After several years, we’ve transitioned back to full Angus bulls from 44 Farms, bringing us back to a strong, consistent world class genetic base that produces highly marbled and tender beef

SELECTING OUR BULLS

When buying bulls today, you don’t just look at the animal — you study the genetic data that comes with him. We prioritize:

• High marbling ratings
• Low birth weight
• High milk production ratings
• Average to high yearling weight

The marbling rating is obvious — higher marbling genetics mean a greater likelihood of producing calves that will finish with exceptional intramuscular fat.

But it’s the other ratings that we believe truly set us apart and give us a slight advantage.

We differ from the mainstream approach in two key areas:

• LOW BIRTH WEIGHT (INSTEAD OF HIGH)

Many programs chase bigger calves at birth. We don’t.

We intentionally prefer low birth weight genetics. That means our calves tend to be a bit smaller when they’re born — but it also means significantly fewer calving complications.

Translation: we very rarely lose a cow or a calf due to birth issues, especially with first-calf heifers. A healthy cow and a strong start matter more to us than bragging rights on birth size.

• HIGH MILK PRODUCTION

This is the second area where we lean in harder than most.

We specifically look for bulls with high milk production ratings. Why? Because the daughters he produces will typically have stronger milk production themselves.

That means their calves grow faster, stay healthier, and get a better start in life — even if they were born smaller.

Finally, we screen for average to high yearling weight. In simple terms, this tells us how efficiently those calves are likely to grow over time. So while they may start smaller at birth, they catch up — and often surpass — others by one year of age.

That combination — strong marbling, low birth weight, high milk production, and solid growth — is what allows us, along with our finishing grass, to consistently raise highly marbled, 100% grass-fed beef.

It’s not an accident.
It’s intentional.