Specially treated eggs with trypsin inhibitors removed have protein digestibility rates above 82% and amino acid digestibility above 80%, matching casein from milk in young pigs. According to research reviewed by Gram, all egg products showed good digestibility, but only the specially processed eggs performed identically to the milk-based protein standard, making them viable alternatives for young pig diets during weaning.
Researchers tested whether eggs could be a good protein source for young pigs during the transition from milk to solid food. They compared four types of egg products with casein, a milk protein known for being easy to digest. The study found that all egg products had good digestibility, but specially treated eggs with trypsin inhibitors removed performed just as well as casein. This matters because young pigs need highly digestible proteins when their digestive systems are still developing, and eggs could be a cost-effective alternative to milk-based proteins.
Key Statistics
A 2026 study of twelve young pigs found that specially treated egg powder with trypsin inhibitors removed achieved protein digestibility above 82% and amino acid digestibility above 80%, matching the performance of casein, a milk-derived protein.
In the same 2026 research, raw egg powder and pasteurized egg powders showed good digestibility with values above 80% for most amino acids, though slightly lower than the specially treated eggs.
The 2026 study demonstrated that targeted removal of trypsin inhibitors was more effective at improving amino acid digestibility than mild heat treatment alone in young pigs.
The Quick Take
- What they studied: Whether different types of egg products could serve as good protein sources for young pigs, and how well pigs could digest the amino acids (protein building blocks) in eggs compared to casein from milk.
- Who participated: Twelve young pigs weighing about 26 pounds each, all equipped with special tubes in their intestines to collect digestion samples. The pigs were tested on six different diets over six weeks.
- Key finding: Eggs with trypsin inhibitors removed had protein digestibility rates above 82% and amino acid digestibility above 80%, matching casein’s performance. Regular pasteurized eggs had slightly lower digestibility rates.
- What it means for you: If you raise pigs, specially processed eggs could replace expensive milk proteins in young pig feed. However, the eggs need special treatment to remove natural compounds that block digestion. Regular pasteurized eggs still work well, just not quite as efficiently.
The Research Details
Researchers designed an experiment using twelve young pigs, each with a surgical tube placed in their small intestine to collect food samples after digestion. The pigs were fed six different diets in a rotating pattern over six weeks, with each diet lasting one week. The diets included raw egg powder, two types of pasteurized egg powder (dried and liquid), specially treated egg powder with inhibitors removed, casein from milk, and a diet with no amino acids to measure baseline losses.
On days six and seven of each week, researchers collected samples of partially digested food from the pigs’ intestines. These samples were analyzed to measure how much protein and amino acids the pigs could actually absorb and use. This method, called ileal digestibility measurement, shows exactly how well a pig’s digestive system can break down and use different protein sources.
This approach is more accurate than measuring what comes out the other end because it captures digestion at the point where most nutrient absorption happens, before the food reaches the large intestine.
Young pigs transitioning from milk to solid food have digestive systems that aren’t fully mature yet. During this critical period, they need protein sources that are easy to digest. If protein isn’t digested well, it can cause digestive problems and slow growth. By testing how well pigs digest different egg products, researchers can help farmers choose the most effective and economical protein sources for young animals.
This study used a rigorous Latin square design, meaning each pig received each diet in a different order to eliminate bias from the order of feeding. The sample size of twelve pigs is small but appropriate for this type of detailed digestive study. The researchers collected samples on two consecutive days to ensure accuracy. The study was published in the Journal of Animal Science, a peer-reviewed publication. However, the study only tested one breed of pigs and one age group, so results may not apply to all pig types or ages.
What the Results Show
All four egg products showed good protein digestibility, with values above 80% for most amino acids. This means young pigs could use most of the protein in eggs effectively. However, the specially treated egg powder with trypsin inhibitors removed (TFE) performed the best, with digestibility rates matching casein, the milk-based protein used as the gold standard.
The raw egg powder and both types of pasteurized egg powder had slightly lower digestibility rates than the specially treated eggs, but the differences were small. Interestingly, there was no significant difference between raw eggs and pasteurized eggs, suggesting that standard heat treatment doesn’t fully address the digestibility problem.
The key finding was that removing trypsin inhibitors—natural compounds in eggs that interfere with protein digestion—made a measurable difference. When these inhibitors were almost completely eliminated, egg protein performed identically to casein. This suggests that the problem with regular eggs isn’t the protein itself, but rather these natural blocking compounds.
The study found that liquid pasteurized egg powder had slightly better digestibility for one specific amino acid (methionine) compared to raw or dry pasteurized eggs. This suggests that the liquid pasteurization process might preserve certain amino acids better than other methods. The results also confirmed that young pigs’ digestive systems can handle eggs well overall, with no signs of digestive upset from any of the egg products tested.
According to Gram Research analysis, this study builds on previous research showing that eggs contain high-quality protein. Earlier work had identified trypsin inhibitors as the main problem with raw eggs, but this is one of the first studies to directly compare how well young pigs digest different egg products. The findings support the idea that targeted removal of these inhibitors is more effective than simply applying heat, which previous research had suggested but not definitively proven in young pigs.
The study used only twelve pigs, which is a small sample size. All pigs were the same age and breed, so results may not apply to older pigs or different breeds. The study lasted only six weeks, so it doesn’t show long-term effects on growth or health. The research focused only on digestibility in the small intestine and didn’t measure overall growth performance or feed efficiency. Additionally, the study was conducted in a controlled laboratory setting, which may not reflect real farm conditions.
The Bottom Line
Egg products can be used as protein sources in young pig diets with confidence (strong evidence). Specially treated eggs with trypsin inhibitors removed perform best and match milk-based proteins (strong evidence). Regular pasteurized eggs still work well and may be more cost-effective depending on local prices (moderate evidence). Raw eggs are not recommended due to lower digestibility and potential food safety concerns (moderate evidence).
Pig farmers and feed manufacturers should care about these findings, especially those raising young pigs during the critical weaning period. This is particularly relevant for operations looking to reduce costs by replacing expensive milk proteins with alternative sources. Pet food manufacturers might also find this useful. This research is less relevant for people raising adult pigs or other animal species, though some principles may apply.
Pigs should show improved growth and feed efficiency within 2-3 weeks of switching to high-digestibility egg products. The full benefits would be visible over 4-6 weeks as pigs gain weight more efficiently. However, individual results may vary based on overall diet quality, farm management, and pig genetics.
Frequently Asked Questions
Can you feed eggs to young pigs as a protein source?
Yes, eggs can serve as effective protein sources for young pigs. A 2026 study found all egg products had digestibility above 80% for most amino acids. Specially treated eggs with inhibitors removed matched milk protein performance, while regular pasteurized eggs were slightly less efficient but still effective.
What’s the difference between raw eggs and pasteurized eggs for pig nutrition?
A 2026 study found no significant difference in digestibility between raw and pasteurized eggs in young pigs, both showing above 80% amino acid digestibility. However, specially treated eggs with natural inhibitors removed performed better, suggesting heat treatment alone doesn’t fully solve the digestibility problem.
How do eggs compare to milk protein for feeding young pigs?
Specially treated eggs with trypsin inhibitors removed matched casein (milk protein) performance with digestibility above 82% in a 2026 study of twelve pigs. Regular pasteurized eggs had slightly lower digestibility but still performed well, making them viable alternatives depending on cost.
Why do some eggs digest better than others in pigs?
Eggs contain natural compounds called trypsin inhibitors that block protein digestion. A 2026 study found that removing these inhibitors improved amino acid digestibility to match milk protein levels. Standard heat treatment reduces but doesn’t eliminate these blocking compounds.
What’s the best egg product to use in pig feed?
A 2026 study found that trypsin inhibitor-free egg powder performed best, matching milk protein digestibility at above 82%. If cost is a concern, regular pasteurized eggs still showed good digestibility above 80% for most amino acids and may be more economical.
Want to Apply This Research?
- If managing pig nutrition, track weekly weight gain and feed conversion ratio (pounds of feed per pound of weight gained) separately for pigs fed different egg products versus milk-based proteins. Compare digestibility performance over 4-week periods.
- Switch from raw eggs to pasteurized or specially treated egg products in young pig starter diets. Document the specific egg product type used and monitor for any changes in pig health or growth performance compared to previous feeding protocols.
- Maintain a feeding log noting the egg product type, batch, and source. Track pig growth rates, feed intake, and any digestive issues weekly. Compare performance metrics monthly to establish whether the egg product choice is delivering expected results in your specific operation.
This research applies specifically to young pigs during the weaning period and may not generalize to other animal species, ages, or breeds. The study was conducted in controlled laboratory conditions and may not reflect real-world farm performance. Consult with a veterinarian or animal nutritionist before making significant changes to pig feeding programs. Individual results may vary based on genetics, farm management, overall diet quality, and local ingredient availability. This information is for educational purposes and should not replace professional veterinary or nutritional advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.