Assessment of the effects of electromagnetic field modification on egg-laying hens in commercial flocks as indicated by production measures.

Objective: To assess the effects of electromagnetic (EM) field modification by use of Nufield EM field modification (NEFM) units on egg-laying hens in commercial flocks as indicated by production measures, including hen-day mortality rate (HDMR) and eggs per hen housed (EHH).

Animals: 16 commercial flocks of egg-laying hens.

Procedure: 5 caged commercial table egg layer flocks (Single Comb White Leghorns) successively housed at the same location during a 6-year period were exposed to NEFM.