Review maps where fetal sexing ultrasound works best in livestock
Bottom line
A new review in Frontiers in Veterinary Science pulls together what’s known about ultrasonographic fetal sex determination in major large domestic animals, with a practical focus on why strong published accuracy doesn’t always translate into reliable on-farm performance. The June 17, 2026 paper, by Ahmed Ali, Derar R. Derar, and Yousef M. Alharbi, compares cattle, horses, camels, and buffaloes, and argues that the main bottleneck in real-world use is often feasibility, not the underlying diagnostic method itself. Across species, the genital tubercle remains the main early landmark, but the review says diagnostic windows, fetal accessibility, and technical demands differ sharply: cattle appear to offer the most consistent early conditions, horses the broadest overall window, camels a narrow but precise window, and buffaloes the thinnest evidence base. (frontiersin.org)
Why it matters: For veterinary professionals working in food animal and equine reproduction, the review is a useful reminder that reported accuracy figures, often above 90% in optimal windows, can overstate what’s achievable in field settings without the right timing, equipment, and operator experience. The authors identify fetal position, gestational age, imaging angle, equipment quality, and examiner skill as major determinants of success, which reinforces the need for species-specific protocols rather than a one-size-fits-all approach. The paper also points to Doppler, 3D imaging, and artificial intelligence as possible tools to reduce operator dependency over time. (frontiersin.org)
What to watch: Expect follow-on work to focus on protocol standardization, buffalo and camel data gaps, and whether advanced imaging or AI can make fetal sexing more dependable outside controlled research settings. (frontiersin.org)
Key facts
- Journal
- Frontiers in Veterinary Science
- Publication date
- June 17, 2026
- Article type
- Review
- Species covered
- Cattle, horses, camels, and buffaloes
- Main landmark
- Genital tubercle
- Cattle window
- Days 56 to 98 of gestation
- Horse window
- Broadest overall window; older guidance cited days 59 to 68
- Camel window
- Days 70 to 77
- Buffalo evidence
- Thinnest evidence base
A newly published review in Frontiers in Veterinary Science takes a broad look at ultrasonographic fetal sex determination in large domestic animals and lands on a practical conclusion: the challenge in practice isn’t usually whether the method can work, but whether it can be applied consistently under field conditions. Published June 17, 2026, the paper synthesizes evidence across cattle, horses, camels, and buffaloes, with an emphasis on translating research performance into day-to-day reproductive management. (frontiersin.org)
That framing matters because fetal sexing by ultrasound has long been presented as a valuable tool for genetic selection, replacement planning, sales strategy, and reproductive decision-making in livestock systems. Earlier literature in large-animal reproduction has already established ultrasound as central to pregnancy diagnosis and broader reproductive management, and equine references have described fetal gender determination as increasingly routine in high-value breeding programs. What this review adds is a comparative, cross-species explanation for why outcomes vary so much between published studies and real farm or ambulatory practice. (sciencedirect.com)
The authors’ core point is that diagnostic accuracy and diagnostic feasibility aren’t the same thing. In the review, most species achieve reported accuracies above 90% during optimal windows, but those windows are narrow, species-dependent, and vulnerable to disruption by fetal position, uterine depth, animal handling conditions, and operator skill. The genital tubercle is identified as the primary early landmark across species, yet its visibility changes with developmental timing and anatomy, which means a technically correct method can still be hard to execute reliably in the field. (frontiersin.org)
The species comparison is one of the paper’s most useful contributions. Cattle are described as the most consistent and predictable model for early diagnosis, with a reported optimal window of about days 56 to 98 of gestation and reported accuracy ranging from 92% to 100%. Horses offer the broadest diagnostic window when transrectal and transabdominal approaches are combined, but that flexibility comes with more technical complexity and higher dependence on examiner experience; older equine guidance cited an early transrectal sweet spot around days 59 to 68. Camels appear to support high accuracy, but within a much narrower working window centered around days 70 to 77. Buffaloes remain the least characterized of the four, with lower reported feasibility and more limited published data. (frontiersin.org)
The review doesn’t appear to be accompanied by a separate institutional press release, and the most direct “reaction” available is the paper’s own translational framing. Still, the broader literature supports its practical emphasis. Older equine and ruminant references likewise stress that fetal sexing depends heavily on timing, image quality, fetal orientation, and examiner familiarity with species-specific anatomy. In that sense, the new review is less a claim of breakthrough performance than a consolidation of what experienced theriogenologists already know: good results depend on getting the right case, at the right gestational stage, with the right operator and equipment. (ivis.org)
Why it matters: For veterinary professionals, especially those in bovine, buffalo, camelid, and equine reproduction, the paper offers a more realistic framework for client communication and service design. It suggests clinics and field veterinarians should be careful about promising “accuracy” without also discussing feasibility, repeat-exam needs, and species-specific limitations. That distinction could shape scheduling, case selection, training, and equipment investment. It also has implications for how practices counsel pet parents and producers in mixed or high-value breeding operations, where a missed window or suboptimal scan can turn a theoretically strong test into an inconclusive one. (frontiersin.org)
The paper also points toward where the field may go next. The authors highlight Doppler ultrasonography, three-dimensional imaging, and artificial intelligence as technologies that could improve consistency and reduce operator dependency, particularly in technically demanding species such as horses. But that future depends on better standardization and more evidence, especially in under-studied species like buffaloes and in challenging field environments where portability, restraint, and repeat access are limiting factors. (frontiersin.org)
What to watch: The next step is likely more applied research, not just more accuracy studies, focused on standardized field protocols, operator training, and validation of newer imaging tools in real production settings rather than idealized study conditions. (frontiersin.org)