[14C]-aflatoxin B1 metabolism in lactating goats and rats.

Four dairy goats in the second to third month of lactation were administered [14C]-Aflatoxin B1 ( [14C]-AFB1). Two goats were dosed intravenously (iv) with 130 muCi (182 muCi/mumol) and two were dosed orally with 196 muCi (256 muCi/mumol). Urine, milk and feces were collected for 120 h after [14C]-AFB1 administration. Recoveries (average of two animals) of 14C in urine, milk and feces were, respectively; 22.7, .97 and 65% (iv dose) and 30.9, 1.05 and 52.3% (oral dose). Aflatoxin M1 (AFM1) was found in milk in the highest concentration. Aflatoxin Q1 (AFQ1) and aflatoxicol (AFL) were found in trace quantities in milk of animals administered the oral dose. In general, AFM1 could account for the majority of dicholromethane-soluble 14C. Liver contained 7.3 and 4.9% of the dose after 120 h for the iv and oral doses respectively. Kidney, heart, lung and spleen all contained .1% or less of the dose at 120 h. Muscle contained .48% of the dose at 120 h from the goats administered [14C]-AFB1 orally. There was no detectable radioactivity in the fat of any goat at 120 h. Six lactating Sprague-Dawley rats with 12 nursing pups were used for comparison of ruminants and simple-stomached animals. Rats were administered 2 muCi of [14C]-AFB1 (125 muCi/mumol) iv (three animals) and orally (three animals). Mean recovery of 14C in urine, mammary plus milk and feces were, respectively; 9.5, 2.0 and 60.7% (iv) and 8.8, 2.6 and 65.0% (orally).(ABSTRACT TRUNCATED AT 250 WORDS)