An Australian study shows a positive effect of feeding mannan oligosaccharides (MOS) on calf immunity. Researchers fed calves milk replacer supplemented with 4 grams of MOS per day from about two days of age until 21 days of age.

Serum-immunoglobulin-G levels decreased in both groups during that time. However, the decline was “significantly less” in the MOS-supplemented calves versus the non-supplemented calves. MOS supplementation also improved other components of the calves’ defense system, including T cell numbers.