1Probiotic 1 (PRO1) = one-time spray-on application of 5
g/2,000 birds of a probiotic consisting of a combination
of Lactobacillus acidophilus, Enterococcus faecium, Lactobacillus
plantarum, and Pediococcus acidilactici [24];
mannanoligosaccharide prebiotic (MOS) = inclusion in the
feed of 4 lb/ton (starter) and 2 lb/ton (grower) of a prebiotic
derived from the cell walls of the yeast Saccharomyces cerevisiae
[23]; probiotic 2 (PRO2) = inclusion in the feed of 2
lb/ton (starter) and 1lb/ton (grower) of a probiotic consisting
of L. acidophilus, Lactobacillus casei, Bifidobacterium
bifidium, and E. faecium [24]; control for the feeding trial
(FCON) = organic diet with no additives.