Crossbreeding, selection strategies key to cow-calf efficiency

Balancing cow efficiency with growing demand for heavier, higher-quality carcasses requires a systems-based approach to breeding decisions, according to Bob Weaber, Kansas State University animal science professor and Extension specialist.  

Weaber spoke recently on this topic during Oklahoma State University rancher’s lunchtime webinar series. He said selecting productive, low-cost cows alongside high-value carcasses, is becoming increasingly important for both commercial cow-calf producers and seedstock operations that supply genetics to the industry. 

Weaber, executive director of the Beef Improvement Federation, said the topic has gained attention in recent years as market signals continue to reward carcass weight and feedlot performance. At the same time, those selection pressures can create challenges at the cow-calf level, particularly through increased mature cow size and associated maintenance costs. 

“This is a complex system,” Weaber said. “There are competing factors and antagonisms between traits that drive profitability and adaptability.” 

Weaning rates and cow size 

Weaber emphasized that focusing too narrowly on individual animal performance can lead producers away from optimal decisions. Instead, herd-level metrics such as weaning weight per cow exposed and percent calf crop weaned provide a more accurate measure of profitability. 

“It’s not the performance of any one calf,” Weaber explained. “It’s the aggregate of all the calves and cows and the input costs that go with them that drive the system.” 

Small improvements in reproductive performance can significantly affect revenue. For example, increasing weaning rates from 83% to 90% in a 100-cow herd adds seven calves to the trailer on sale day. At current prices, that change alone can generate thousands of dollars in additional income. 

“No matter how you sell calves, gross pay weight drives the bus,” Weaber said. “If you don’t deliver head and pounds to the market, you don’t get paid.” 

Cow size is another major factor influencing efficiency. Larger cows require more feed resources, which reduces stocking rates and the total number of calves produced on a given land base. Research has shown that operations running larger cows may carry fewer animals, limiting output and profitability. 

Weaber pointed to work demonstrating that a resource base capable of supporting 100 cows weighing 1,000 pounds would support significantly fewer cows at 1,400 pounds. That reduction in inventory translates directly into fewer calves marketed. 

“Managing cow weight as a proxy for maintenance requirements and resource utilization is critical because it changes the number of calves that we have available to push into the marketing channel,” he explained. 

Taking advantage of hybrid vigor 

Crossbreeding remains one of the most effective tools for improving efficiency, particularly on the maternal side. Weaber said heterosis, or hybrid vigor, contributes to improved fertility, longevity and overall productivity in crossbred cows. 

“About two-thirds of the economic benefit of crossbreeding comes from crossbred cows,” he said. 

In modeled scenarios, crossbreeding systems produced higher weaning rates, heavier calves, and greater total output over time compared with straightbred systems. Weaber estimated the value of heterosis at about $460 per cow annually under typical assumptions. 

Even modest percentage improvements in traits such as calf survival and weaning weight can accumulate into substantial gains. Over a 10-year period, crossbred herds can produce significantly more total pounds of calf weight, improving overall efficiency and lowering unit costs. 

Weaber said maintaining heterosis in the cow herd should be a priority. If trade-offs are necessary, they should occur in the terminal calf rather than in replacement females. 

Replacement heifer selection plays a central role in long-term herd performance. Most producers retain their own heifers, which limits selection intensity on the female side. As a result, sire selection becomes the primary driver of genetic change. 

“A three-generation pedigree accounts for about 87.5% of the gene flow,” Weaber explained. “Those are the sire, the maternal grand sire and the maternal great grand sire. We should take time and effort to make sure that we pick the right bulls.” 

He noted a small number of sires account for most of genetic influence within a herd. Selecting the right bulls for replacement females is critical to improving longevity, fertility and adaptability. 

Setting females up for success 

Environmental factors also influence heifer success. Heifers born early in the calving season tend to have an advantage in reproductive performance and longevity. Data from multiple research institutions indicate early-born heifers remain in the herd longer than those born later in the season. 

Weaber said these factors should be considered alongside genetic selection when identifying replacement candidates. 

He challenged the idea that a single bull can meet all production goals. Antagonisms between maternal traits and carcass characteristics make that approach increasingly difficult. 

“It’s getting harder and harder for us to do because of some of the antagonisms, unless we take a real tactical diversion in the way that we build replacement females,” he said. 

Instead, Weaber recommended separating maternal and terminal breeding decisions. Under this approach, producers use one set of bulls to generate replacement females and another set to produce market calves. 

This strategy allows for greater flexibility in matching genetics to specific roles. Maternal sires can be selected for traits such as fertility, moderate size, and longevity, while terminal sires can focus on growth, carcass weight, and marbling. 

The approach is widely used in other livestock sectors and is gaining traction in beef production, particularly among larger operations. 

“We can build the cow we need and the calf the market wants,” Weaber said. 

Utilizing selection indexes 

Selection indexes provide a tool for implementing these strategies. By combining multiple expected progeny differences into a single economic value, indexes help producers evaluate animals based on overall profitability rather than individual traits. 

Weaber said indexes tailored to specific production scenarios—such as retaining replacements or selling calves at weaning—can simplify decision-making and account for trade-offs between traits. 

Tools such as iGENDEC allow producers to customize indexes based on their own cost structures and marketing endpoints. Breed associations also offer standardized indexes designed for common production systems. 

“Selection index tools provide us a really nice way to rank differences of individual bulls across the trade suite against their profit, generating potential and balancing those things out,” Weaber said. 

For example, maternal indexes often emphasize traits related to maintenance costs, fertility, and weaning weight, while terminal indexes focus on carcass traits and feed efficiency. 

Weaber said the key is aligning selection tools with the operation’s goals, whether that involves selling calves at weaning, retaining ownership or targeting specific carcass markets. Ultimately, he said, successful breeding programs require integrating genetics, management and economics into a cohesive system. There is no one-size-fits all solution, but with a systems approach, producers can stay focused on profitability and make better decisions for the long-term. 

Lacey Vilhauer can be reached at 620-227-1871 or [email protected].

PHOTO: (Photo by John Price via Unsplash.)