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Biological Effects of Ionizing Radiation on Milk Synthesis. II. Milk Production and Composition¹

Department of Animal Husbandry, University of California, Davis

ABSTRACT

A study was made of the milk produced by X- and gamma-irradiated cow and goat mammary glands. Exposures of 34 to 78 r were made with a 250-kvp 30-ma X-ray machine; higher levels (150–2,500 r) were administered with a specially designed Co⁶⁰ irradiator. Milk samples were taken at frequent intervals before and after irradiation for determination of chemical composition.

Dose levels of less than 1,000 r had no demonstrable effect on milk production or per cent composition of fat, solids-not-fat, total solids, lactose, citrate, total nitrogen, nonprotein nitrogen, total phosphorus, inorganic phosphorus, chloride, ash, sodium, potassium, calcium, or magnesium. Exposure to 1,000 r or more of gamma irradiation, however, always inhibited milk production.

¹ This research was supported by a contract with the U.S. Atomic Energy Commission.

² Present address: Institute of Arctic Biology, University of Alaska, College, Alaska.

³ Address for reprints: Department of Animal Husbandry, University of California, Davis, California.