Study suggests cull beef cows may respond well to finishing
Bottom line
A new study in Animals compared 9 cull beef cows with 9 fattening bulls under the same 60-day feedlot program and found that the cull cows finished heavier, gained weight faster, and ate more feed, while also showing differences in rumen fermentation, microbial activity, and blood metabolites. The paper argues that culled beef cows can still deliver meaningful finishing performance after reproductive use, rather than being treated only as low-value salvage animals. Outside coverage of the study also noted a commercial catch: despite stronger growth, the cows’ daily gain margin was lower than the bulls’ because feed costs were higher. (genelibs.com)
Why it matters: For veterinary professionals working with beef clients, the study adds to a growing body of evidence that cull females may respond well to short-term finishing, but profitability depends on ration cost, intake management, and close monitoring of metabolic and digestive adaptation. That matters not just for nutrition planning, but also for welfare and culling decisions, because keeping end-of-career cattle in feeding systems raises questions about body condition recovery, transport timing, and whether the extra days on feed improve both value and animal outcomes. Broader literature on cull-cow finishing and beef-cattle welfare suggests those tradeoffs deserve case-by-case oversight. (dairy.extension.wisc.edu)
What to watch: Whether follow-up work validates these results in larger commercial groups, with carcass outcomes, welfare measures, and economics reported together. (agronews.com)
A newly indexed paper in Animals reports that cull beef cows may have more finishing potential than many production systems assume. In the study, Junjie Bao, Hao Li, and Kexin Jiang compared 9 cull beef cows and 9 fattening bulls fed the same total mixed ration under identical feedlot conditions for 60 days, and found the cows outperformed the bulls on final body weight and average daily gain while also showing distinct rumen and metabolic profiles. (genelibs.com)
That finding lands in a familiar industry debate: whether retaining cull females for a short finishing period can convert a low-value exit animal into a more profitable beef product. Earlier work has shown that cull cows can respond to targeted feeding, with effects on gain, carcass value, and meat quality, although outcomes vary with diet, days on feed, and production goals. Recent extension and review literature has framed this as both a nutrition question and a management one, especially when feed costs, body condition, and welfare are part of the equation. (dairy.extension.wisc.edu)
According to the study summary available through journal indexing and secondary coverage, the comparison covered growth performance, body condition, apparent nutrient digestibility, economic return, serum biochemistry, rumen fermentation, microbial gene abundance, and plasma metabolomics. The cull beef cows reportedly ended the trial with higher final body weight, average daily gain, and average daily feed intake than the bulls. At the same time, their biological responses moved in parallel, suggesting that the improved growth was tied to measurable differences in digestive metabolism rather than simple weight rebound alone. (genelibs.com)
Industry writeups of the paper emphasized the economic nuance. While the cull cows generated greater daily gain revenue, one report said their daily gain margin was still lower than the bulls’, at 7.26 versus 8.36 RMB per head per day, because the cows consumed more feed. That distinction is important: better biological performance does not automatically translate into better net return, particularly in high-cost feeding environments. (agronews.com)
There does not yet appear to be a formal press release or broad expert commentary tied directly to this paper, at least in readily accessible sources. Still, the result fits with adjacent research showing that mature cull cattle can respond to strategic finishing, while the value of that response depends heavily on feeding duration, ration design, and market endpoint. Work in dairy and beef cull cows has similarly suggested that extra days on feed can improve value and condition, but not every system captures that value efficiently. (dairy.extension.wisc.edu)
Why it matters: For veterinarians and nutrition advisers, the practical takeaway is less “finish every cull cow” than “segment cull candidates more carefully.” If these findings hold up, some cull beef cows may justify a short feedlot phase, but only when they enter with acceptable health status, locomotion, dentition, and enough remaining productive resilience to convert feed safely and predictably. Veterinary input matters on transition risk, rumen adaptation, lameness, transport fitness, and whether a pet parent-facing sustainability conversation in companion animal medicine has a parallel here in food-animal practice: getting more value from animals already in the system, without compromising welfare. EFSA’s recent welfare review specifically includes end-of-career cull cows among the categories needing careful decision-making around feeding, housing, and euthanasia thresholds. (efsa.onlinelibrary.wiley.com)
There’s also a broader systems angle. Beef production analyses have long treated cull animals as part of the output stream, and newer work on valorization strategies is pushing the sector to think harder about how finishing, carcass quality, and economics intersect. This study adds a digestive-metabolism layer to that conversation by suggesting the mature female animal is not simply a poorer version of the conventional fattening bull, but may respond differently in ways that can be measured at the rumen and blood level. That’s potentially useful for ration formulation and selection criteria, but it needs validation beyond a small 18-head trial. (academic.oup.com)
What to watch: The next step is publication of the full article details and any follow-on studies that test larger populations, carcass performance, and commercial economics over longer finishing windows. For now, the study is best read as an early signal that some cull beef cows may deserve a second look as finishing candidates, with veterinary oversight focused on intake, welfare, and margin discipline. (genelibs.com)
Common questions
What did the study find about cull beef cows compared with fattening bulls?
In a 60-day feedlot trial, the cull beef cows finished heavier, gained weight faster, and ate more feed than the bulls, with differences also seen in rumen fermentation, microbial activity, and blood metabolites.Did the cull beef cows make more money than the bulls?
Not necessarily. One report said the cows had a lower daily gain margin, 7.26 versus 8.36 RMB per head per day, because they consumed more feed.How many animals were in the study?
The study compared 9 cull beef cows with 9 fattening bulls.What is the main takeaway for beef clients?
Some cull beef cows may still respond well to short-term finishing after reproductive use, but profitability depends on feed costs, intake management, and close monitoring of metabolic and digestive adaptation.