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Metabolism of Fenac Herbicide in a Lactating Cow

Pesticide Residue Laboratory, Department of Entomology, Cornell University, Ithaca, New York 14850

ABSTRACT

A study was made of the excretion and metabolism of Fenac herbicide in a lactating cow. At a herbicide level of 5 ppm in the feed a gas chromatographic peak with the identical retention time of the major herbicide isomer (2,3,6-trichlorophenylacetic acid) was present in hydrolyzed and unhydrolyzed urine representing, respectively, 52.8% (as the conjugated acid) and 18.6% (as the free acid) of the total herbicide dose. Fenac was absent in milk and feces samples. the herbicide was not degraded when incubated with rumen fluid or the 10,000 x g supernatant fraction of beef liver.