Biochemical modifications in the bursa of fabricius, thymus and adrenals of chickens injected with an anti-bursal serum.

Cornish-Rock chickens were given 0.3 ml anti-bursal serum in the pectoral muscle on the first day of life. Three days after serum administration, the modifications were evident both in the bursa of Fabricius and thymus (ponderal involution and decrease of RNA and glycogen contents). Pronounced thymo-bursal differences appeared at 13 days: in the bursa the values were normalized; in the thymus inverse modifications appeared as compared to the 3 days values. The modifications in the adrenals are in agreement with those in the lymph organs.