Husbandry and Sample Collection
Eighty male Ross 308-d-old broiler chicks were
obtained from a commercial hatchery and were brooded
in a single floor pen and fed a standard chicken
starter feed until 7 d of age. The diet did not contain
any coccidiostat or antimicrobial growth promoters,
prophylactics, or other similar additives. The birds
were vaccinated for infectious bronchitis and Marek’s
disease at the hatchery.