The Study
Evaluating Beef Fatty Acid Composition and Lipid Quality in Response to Silage Type and Feeding Intensity During the Finishing Phase
This study showed that if you feed cows different kinds of silage and more or less grain, it changes the fat in their meat — like making more good fats or less bad ones. But it didn’t test if eating this meat makes people healthier — only what happens in the cow.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists fed bulls different diets to see how it changed the fat in their meat. Some got more grain, some got more grass, and they mixed it up to see what made the best fat.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 516 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1More fat means better marbling and taste; more omega-3s make the beef slightly healthier for your heart, though the changes are small.
- 2Bulls fed more grain (50:50) had 55% more fat in their meat (2.26% → 3.50%).
- 3Bulls fed grass silage had 24% more good omega-3 fats (0.88% → 1.09%) and a better omega-6 to omega-3 ratio (4.84 → 4.19).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Animals : an Open Access Journal from MDPI
Year
2026
Authors
Z. Nogalski, M. Momot
Related Content
Claims (5)
Grass-fed beef has 30–40% more conjugated linoleic acid and more vitamin E than grain-fed beef.
Feeding finishing Holstein-Friesian bulls a diet of 50% forage and 50% concentrate increases intramuscular fat from 2.26% to 3.50% of muscle weight compared to a diet of 70% forage and 30% concentrate, improving marbling without changing the proportions of fatty acids.
When finishing Holstein-Friesian bulls are fed grass silage instead of maize silage, the intramuscular fat contains a higher proportion of n-3 polyunsaturated fatty acids and a lower n-6/n-3 ratio, with no change in total fat content.
Increasing the amount of feed given to cattle raises the total quantity of fatty acids in beef by 40–50% per 100 grams of muscle because of more fat inside the muscle, but the percentages of saturated, monounsaturated, and polyunsaturated fats remain unchanged.
In Holstein-Friesian bulls, the combination of silage type and feeding intensity directly changes the amounts of specific fatty acids, including C18:3 n-3 and DPA, in muscle fat, and this change depends on the type of forage in the diet.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.