When radioactively labeled 2,4-D was fed to livestock, 90% or more of the total radioactive residue (TRR) was shed in urine unchanged or as conjugated forms of 2,4-D. A relatively small portion of 2,4-D was metabolized into dichlorophenol, dichloroanisole, 4-chlorophenoxyacetic acid (6.9% of the TRR in milk), and 2,4-dichlorophenol (5% of the TRR in milk; 7.3% of the TRR in eggs and 4% of the TRR in chicken liver). Residue levels in kidney were the highest.
2,4-Dichlorophenoxyacetic acid
2,4,5-Trichlorophenoxyacetic acid
Ipriflavone
Povidone-iodine
Tuberculinic acid
Griseofulvin
Terbinafine
Ketoconazole