Studies indicate that feeding colostrum after birth could support stronger immunity, better intestinal health, and reduced disease risk in dairy calves.
Extended colostrum feeding is drawing interest among dairy producers as a potential way to support calf health after the critical first hours of life.
The practice involves providing colostrum or transition milk beyond the first 24 hours, often using milk collected during the cow’s second through sixth milkings.
Penn State Extension Assistant Clinical Professor and Extension Veterinarian Vinicius Buiatte emphasizes that the first colostrum feeding remains the most important step. Newborn calves quickly lose their ability to absorb maternal antibodies through the intestine.
Antibody absorption decreases significantly within about 12 hours and essentially ends by 24 hours after birth.
Calves should receive approximately 10% of their body weight in high-quality colostrum, containing at least 50 mg of IgG per milliliter, during the first 2 to 6 hours of life. This early feeding helps establish passive immunity and provides nutrients and bioactive compounds that support early development.
Colostrum contains considerably more protein and fat than regular milk, as well as antibodies, immune cells, cytokines, antimicrobial compounds, growth factors, and oligosaccharides. These components may contribute to immune function, intestinal development, and the establishment of a healthy microbial population in the digestive tract.
Although the concentration of these compounds declines as milk production returns to a normal composition, transition milk can continue to provide useful nutrients and biological components.
Research reviewed by Renaud and Steele in 2024 suggests that feeding colostrum or transition milk for several days may benefit intestinal development.
Studies from Michigan State University found that calves receiving transition milk for three days had greater body weight and improved intestinal development compared with calves receiving only milk replacer.
Research from Washington State University also reported fewer cases of scours and reduced antibiotic use among calves given colostrum powder alongside milk replacer for 14 days.
However, extended colostrum feeding requires careful attention to hygiene, availability, herd health, and cost. Pooling milk from several cows can increase disease-transmission risks, making proper storage, pasteurization, freezing, or commercial replacers important management considerations.
Buiatte stresses that producers should first prioritize timely, high-quality colostrum administration. Extended supplementation may provide additional advantages, but further research is needed to establish consistent recommendations for different dairy operations.
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