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Iodine Uptake by Ova of Hens Given Excess Iodine and Effect upon Ova Development^{1, 2,}

Departments of Animal and Poultry Science, University of Florida, Gainesville, Florida

White Leghorn hens were dosed orally for 14 days with a solution of sodium iodide labeled with ¹³¹I and iodine excretion into developing ova, eggs, whole body and selected tissues was determined. Daily dosage levels were 100 mg in a single dose, 500 mg in 2 administrations or 500 mg in a single dose. Iodine in the eggs of hens given 100 mg iodine daily increased linearly for 10 days and reached a plateau of approximately 3 mg/egg at that time. Concentration in the eggs from those given 500 mg increased rapidly to an average content of 7 mg/egg by 8 days at which time most hens ceased production. Ova continued to develop in hens not laying and many ova were found to be regressing. It is suggested that when a threshold amount of iodine reaches the ova, development ceases and regression takes place.

² Supported in part by Public Health Service Research Grant no. AM-08760 from the National Institute of Arthritis and Metabolic Diseases.

³ Present address: Gerencia de Energía, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina.

Manuscript received 15 September 1967.