Cow Size Archives - American Cattlemen

Do you have enough resources? Why cow size matters now more than ever

As genetics continue to evolve, the modern beef cow is bigger, more productive and more demanding. But is every operation equipped to feed her?

It’s a question Dr. Elizabeth Belew, beef nutritionist with Purina^® Animal Nutrition, gets asked frequently. From walking pastures with producers to consulting on feed programs across the country, Dr. Belew has seen firsthand that one size does not fit all. With finishing weights increasing over the past two decades, it’s clear that cow size on cow-calf operations has followed suit.

“Industry trends are shaping the story,” says Dr. Belew. “We’ve seen steady increases in finishing weights, and that has a direct correlation to mature cow body size. Bigger cows are here, and producers need to make sure their management practices match.”

Bigger cow, bigger needs

While genetic advancements have helped producers achieve more, from increased beef production to increased pregnancy rates, they’ve outpaced management practices in some herds. This has directly impacted grazing pressure, nutritional requirements and producers’ bottom lines. As body size increases, so does the cow’s requirements. This means producers need more forage and more feed to support their cows.

“If you go from managing a 1,000-pound cow to a 1,500-pound cow, that’s a 50% increase in body weight,” Belew explains. “But her energy requirement doesn’t increase linearly, it goes up about 36%. That’s still a significant bump.”

Let’s break it down. Using 2.5% of body weight as an intake estimator:

A 1,000-lb. cow will consume about 25 lbs. of dry matter daily.
A 1,500-lb. cow will need roughly 37-38 lbs. of dry matter daily.

That difference adds up to approximately 4,500 additional lbs. of forage per cow, per year. Multiply that by herd size, and the forage demands become clear.

“If you don’t have the resources, whether that’s pasture, feed or labor, then that cow’s size could start working against you,” Dr. Belew says.

In addition to dry matter intake, it is important to ensure each cow is receiving the right minerals to support their needs and size. Purina^® Wind and Rain^® Minerals are available as a comprehensive line of beef cattle minerals designed to address the mineral deficiencies of the available forage, in a palatable, weather-resistant and granular formula.

So, what’s the “ideal” cow size?

So, what’s the “ideal” cow size? It depends entirely on the operation.

“I get this question a lot,” says Dr. Belew. “There’s no universal answer. A 1,500-pound cow might be perfect for one producer and totally unsustainable for another.”

What matters the most is matching cow size to the feed, land, management and labor available. It’s not about shrinking your herd, it’s about feeding what you’ve got, appropriately and efficiently.

“If you’re better suited for a 1,300-lb. cow based on your land and resources, then do what’s right for your operation,” she says. “I’m not here to tell producers to raise smaller or bigger cows. I’m here to help them feed the cow they’ve chosen.”

Are bigger cows weaning bigger calves?

With greater inputs come greater expectations. One question that often arises is whether a larger cow justifies her cost by weaning a proportionally larger calf.

Dr. Belew suggests using a common benchmark: weaning 50% of the cow’s body weight.

A 1,000-lb. cow should wean a 500 lb. calf.
A 1,500-lb. cow should wean a 750 lb. calf.

“Can that 1,500-pound cow get it done? I think she can, but only if she’s fed to meet her needs,” says Belew. “You can’t expect that kind of output if you’re not meeting her nutritional demands.”

That’s where management tools like creep feeding come in. For some producers, creep feeding can help calves reach their genetic potential without placing the entire nutritional burden on the cow, especially during times of forage shortfall.

“There’s definitely a play for creep feeding in today’s herds,” Dr. Belew says. “Creep feeding Purina^® Accuration^® Creep programs can help close the gap between what the cow and forage can deliver and what the calf needs to thrive.

Grazing pressure and stocking rates

Another often-overlooked aspect of increasing cow size is its impact on stocking rates. With each cow requiring more forage, it may not be realistic to run the same number of animals on the same piece of land.

“If we’re still trying to run the same number of cows that our grandparents did on the same unit of land, we might be overstocked without realizing it,” Dr. Belew notes. “We’re not feeding the same animal anymore.”

For many producers, this realization comes with hard choices: reducing herd size, investing in more feed or adjusting genetics over time. Regardless of the route, understanding cow size and how it impacts daily and yearly forage needs is essential to long-term sustainability of your herd.

Practical takeaways for producers

If you’re managing a herd today, Dr. Belew encourages you to ask a few key questions:

What is the average weight of my mature cows?
- Eyeballing isn’t enough. Take the time to weigh them on a scale or compare your sale barn ticket to find the average of your herd.
Am I matching my nutrition program to actual cow size and performance goals?
- Bigger cows need more energy. During breeding, analyze your cow’s body condition score and make improvements if needed to meet your herd’s needs prior to weaning.
How do my weaning weights compare to cow size?
- Compare your weaning weights to your average cow size to better understand if your cows are properly supporting their calves.
Can my land support the grazing needs of a heavier herd?
- Especially in drought-prone areas, reevaluate your land to ensure you are meeting the needs of your herd.
Where does creep feeding make sense in my system?
- If resources are available, consider feeding Purina® Accuration® Creep feed to complement mother’s milk and available forage, while boosting calf gain prior to weaning.

Bottom line: Feed the cows you have

Today’s cattle genetics offer incredible potential, but they require thoughtful, informed management to deliver results. Cow size can be a powerful advantage or a costly liability depending on how it’s supported.

“Bigger cows can absolutely work in a herd,” Belew says. “Whether you’re managing 50 cows or 500, the message is the same: feed strategically, stock appropriately and never assume one size fits all.”

Want to evaluate your herd’s nutritional plan or forage efficiency? Connect with your local Purina^® Cattle representative or visit PurinaMills.com/cattlecare to learn more.

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Are your cows too big? “Producers get paid for pounds, so ‘growth-bulls’ are selected, and the biggest heifers are retained,” says Ron Scott, Ph.D., cattle nutritionist with Purina Animal Nutrition.

This has achieved positive outcomes as producers aim to maximize profit by increasing pounds of production and selling heavier calves each year. While this breeding and management strategy has shown its merits, on the output side of the equation, larger cows aren’t always as profitable as you might think.

“Larger cow size can come with a larger price tag when you factor in higher inputs and reduced efficiency in pounds weaned,” says Scott. “To maximize profit potential, finding the middle ground between the cost of raising larger calves and their value at sale time can be important.”

Here are three tips to help you find the optimal cow size for your operation and manage it to improve efficiency:

1. Consider both inputs and outputs

It’s important to account for all profitability aspects when evaluating the right cow size for your operation.

On the input side, larger cows eat more than smaller cows, resulting in higher costs for feed and forage. The good news is that cows get slightly more efficient per pound as they grow. A 1,500-pound cow is 50% larger in weight, but her energy requirements are only approximately 36% greater than those of a 1,000-pound cow.[2]

“However, the accuracy of this, in practicality, is debatable because of the ‘boss-cow’ effect,” says Scott. “Those bigger cows are the dominant cows, and they always will be first on the pecking order for feed resources. In other words, they take more than they need and that ‘extra’ is taken away from the smaller cows.”

On the output side, you’re selling bigger calves and getting paid for their increased weight. However, it might cost more to raise those calves. With larger calves, you must respond to their nutritional needs, ensuring they can keep up and continue gaining weight.

“Another consideration is that while cow size has been increasing, the percentage of weaning weight for calves hasn’t equally adjusted its ratio to make up for the larger size,” says Scott.

Data from North Dakota State University shows that a 1,000-pound cow weans 48.5% of her body weight compared to 43.6% for a 1,400-pound cow.[3] Essentially, calves born from larger cows aren’t as efficient as calves born from smaller cows.

“Getting a complete picture of inputs and outputs can help you find the sweet spot when it comes to cow size for your operation to maximize profits,” says Scott.

2. Maximize forage resources

While cows have become larger, stocking rates have not kept up with genetic gain in cow size. Many producers are running the same number of cows on the same number of acres as they always have.

“Overstocking can be problematic because cows may not get the nutrients, they need from forage,” says Scott. “Traditional stocking rates are based on a 1,000-pound mature cow size, yet many cows surpass that threshold today.”

Consider this: A 1,500-pound cow is 1.5 times larger than a 1,000-pound cow. This means the larger cow needs about 1.5 times more nutrients than the smaller cow. To meet her forage needs, you would need to increase your stocking rates by 1.5 times.

“Adjusting stocking rates can ensure cows aren’t short-changed on nutrients and that pasture resources are used more efficiently,” says Scott. “Since most producers can’t easily weigh their cows, it can be challenging to know how much to increase the stocking rates for your specific operation.”

Consider investing in a digital or portable scale; this year is a great time to reinvest in your facilities with the added profits from the bullish cattle market. If an on-farm scale isn’t in the cards, consider weighing your herd on the trailer at a local cooperative when hauling your cows to pasture or evaluating cull cow weight using the weights listed on the sale bill.

3. Avoid nutrition gaps

While increasing stocking rates can help support nutritional needs, we can’t expect cows to get by on forages alone. Across the industry, particularly on the cow side, producers run the risk of not optimizing their profit potential by not fully meeting the nutritional needs of larger-sized cattle.

“Bigger cows have more significant nutritional requirements,” says Scott. “Meeting their increased nutritional needs can have cascading effects that could lead to improved profitability.”

Cows managed for optimal body condition scores at calving have been shown to rebreed with 88% or greater conception rates.[4] And, by providing adequate nutrition to cows during each stage of gestation, you can better support the calf’s birth and weaning weight, immune function, finishing growth and value to the herd if the calf is kept back. A nutrition program that meets your herd’s requirements helps ensure your genetic investment can be fully maximized, regardless of your average cow size.

“Free-choice tub, block or liquid supplements can help you more efficiently meet any nutrient gaps cows might face,” says Scott. “Monitoring intakes can also help you manage forages and stocking rates.”

If cows are eating more of the supplement than the target, dig in and ask some questions. Do I have enough forages? Is the forage quality high enough? Do I have an accurate pulse on my cows’ nutrition requirements? Free-choice products help give you a barometer for your nutrition program overall.

“Bigger cows can mean bigger costs, but also bigger profit potential,” says Scott. “Finding the right cow size for your operation and managing cows to help maximize efficiency may lead to greater profit potential.”

Contact your local Purina^®dealer or visit purinamills.com/cattlecare for more information on how you can best manage your cows.

Purina Animal Nutrition LLC (www.purinamills.com) is a national organization serving producers, animal owners and their families through more than 4,700 local cooperatives, independent dealers and other large retailers throughout the United States. Driven to unlock the greatest potential in every animal, the company is an industry-leading innovator offering a valued portfolio of complete feeds, supplements, premixes, ingredients and specialty technologies for the livestock and lifestyle animal markets. Purina Animal Nutrition LLC is headquartered in Arden Hills, Minn. and a wholly owned subsidiary of Land O’Lakes, Inc.

Expert advice for identifying and managing the right-size cow for your operation.

Arden Hills, Minn. [March 31, 2025] – Cow size has been on the rise for decades. Cows today weigh 1.4 times as much as their predecessors in 1980. In fact, cow weight is rising 100 pounds every 10 years.[1]

American Cattlemen 2025

[1] National Agricultural Statistics Service. United States Department of Agriculture. 2019.

[2] NASEM (National Academies of Sciences, Engineering, and Medicine). 1984. Nutrient Requirements of Beef Cattle. 6th ed. The National Academies Press.

[3] Dhuyvetter, J. 2009. Focusing on cows in a high cost world. North Dakota State University. Accessed Aug. 21, 2024.

[4] Rasby, R.J, Stalker, A, and Funston, RN. Body condition scoring beef cows: A tool for managing the nutrition program for beef herds. Accessed Aug. 21, 2024.

Tag: Cow Size

Do You Have Enough Resources for Your Cow Herd?