J Vet Intern Med. 2008 Mar-Apr;22(2):499-502.
Enhanced bactericidal activity against Escherichia coli in calves fed Morinda citrifolia (Noni) puree.
Schäfer M, Sharp P, Brooks VJ, Xu J, Cai J, Keuler NS, Peek SF, Godbee RG, Schultz RD, Darien BJ.

Noni fruit puree was fed daily to newborn calves.  After two weeks, blood samples from noni-fed calves had significantly more E. coli bacterial killing activity than those from calves that were not given noni.  Thus, the immunomodulatory effect of noni puree was demonstrated and may be useful in promoting health.  (view original abstract at https://www.ncbi.nlm.nih.gov/pubmed/18346148).