Study examines choline’s role in late-laying hen liver health

A newly published Animals study looked at a practical question for extended-lay systems: can added dietary choline help older hens stay productive while protecting liver health through 100 weeks of age? In the trial, 240 Hy-Line Brown hens were fed one of four diets containing 0%, 0.07%, 0.28%, or 0.84% supplemental Choline-50% from 66 to 100 weeks, with researchers evaluating production performance, egg quality, and liver characteristics over the long feeding period. (mdpi.com)

The timing matters. Commercial genetics programs increasingly support keeping brown layers in production to 100 weeks, and Hy-Line’s North America guide includes performance standards through that point. As hens age, metabolic strain on the liver becomes more important because the organ is central to lipid handling and yolk precursor synthesis. That’s one reason late-lay nutrition has become a bigger focus for both production and veterinary teams. (hylinena.com)

Choline has been studied in layers before, but the picture has been mixed. Earlier work in Poultry Science found supplemental choline could reduce liver total lipid and triglyceride, increase serum very low-density lipoprotein, and improve hepatic antioxidant measures, even when production responses were limited. More recent work on organic choline products has also pointed toward improved liver condition and some production or egg-quality benefits, although not every liver endpoint has reached statistical significance. Taken together, the literature suggests choline may be most useful when liver lipid metabolism is under pressure, rather than as a universal production booster. (sciencedirect.com)

That background is especially relevant in older flocks. Fatty liver hemorrhagic syndrome is a common noninfectious metabolic disorder in commercial layers, associated with hepatic fat accumulation, hemorrhage, reduced production, and sudden death. Merck notes it is more common after 35 weeks, particularly in overweight birds, and emphasizes that a healthy liver is key for high egg production. In other words, a nutrition study centered on liver characteristics in 66- to 100-week-old hens is addressing a real field concern, not just a laboratory endpoint. (merckvetmanual.com)

The new Animals paper appears to build on that concern by testing a wide range of supplemental choline levels in late-laying Hy-Line Browns during an extended cycle. While the source material provided here summarizes the design more clearly than the full results, the study’s framing aligns with prior evidence that choline can influence lipid metabolism, yolk composition, oxidative status, and liver fat handling in layers. That makes the article notable even beyond its specific numeric results: it adds age-specific data for a production phase where evidence is still thinner than in peak-lay birds. (mdpi.com)

There does not appear to be a separate press release or broad industry reaction attached to this publication in the sources reviewed, which is common for nutrition papers in poultry journals. Still, the wider industry context is clear. Management guides for modern brown layers include choline targets around this stage of production, and research attention is increasingly shifting toward nutritional tools that support persistency of lay, shell quality, and metabolic resilience as flocks remain in production longer. That makes this study more relevant to field veterinarians, technical service teams, and nutritionists than its narrow title might suggest. (hylinena.com)

Why it matters: For veterinary professionals working with commercial poultry, the practical question isn’t simply whether choline changes one production metric. It’s whether targeted supplementation can lower liver-related risk in aging hens, support flock persistency, and reduce the metabolic drag that shows up as poorer egg output, compromised shell quality, or unexplained mortality. If the study confirms liver benefits with limited downside, it could support more tailored late-lay feeding strategies, especially in flocks with heavier body weights, high-energy diets, or prior liver health concerns. (merckvetmanual.com)

What to watch: The next step is validation under commercial conditions, including cost-benefit analysis, interaction with methionine and other methyl donors, and whether any liver improvements hold up at flock scale through the end of lay. Future work that links choline dose to mortality, fatty liver scores, egg mass, and feed efficiency in extended-lay systems will be the most useful for practice. (sciencedirect.com)