DETAILED DESCRIPTION I claim: 1.
An animal pour-on pesticidal formulation which comprises at least one pesticide comprising between 0.
1% and 10% of a synthetic pyrethroid selected from the group consisting of alphamethrin, allethrin, barthrin, bioresmethrin, biopermethrin, cismethrin, cyclethrin, cypermethrin, cyhalothrin, cyfluthrin, cyphenothrin, deltamethrin, dimethrin, fenpropanate, fenvalerate, flumethrin, flyvalinate, indothrin, permethrin, phenothrin, phthalthrin, resmethrin, tetramethrin, sumithrin, tralomethrin and tralocythrin; between 0% and 10% of an organophosphate selected from the group consisting of tetrachlorvinphos and diazinon; an amidine selected from the group consisting of cymiazol, amitraz and chlormethiuron; between 0.
1% and 10% of a synergist selected from the group consisting of piperonyl butoxide, bucarpolate, N-octylbicyclohexenedicarboximide, 1,2-methylendioxy-4-(2-oxtylsulfinyl)-propyl-benzol, propylisone, propinylcarbamate, propinylether, propinyloxime, propinylphosphonate, sesamex, S,S,S-tributylphosphorothioate and sulfoxide; between 0 to 30% of diacetone alcohol as a polar solvent; between 0 and 5.
0% of a fly repellant in the form of a non-polar co-solvent selected from the group consisting of dibutylphthalate and stabilene; and at least one vegetable oil consisting of glycerides of carboxylic acids with carbon chain lengths of more than 14 carbon atoms as carrier of the pesticide, said carrier comprising at least 70% m/v of the formulation.
2.
The pesticidal formulation of claim 1 wherein the synthetic pyrethroid is cypermethrin.
3.
The pesticidal formulation of claim 1 wherein the synthetic pyrethroid is cypermethrin enriched as to the (1R cis)S and (1S cisR) enantiomer isomer pair of alpha-cyano-3-phenoxybenzyl-3-(2,2-dichlorovinyl)-2,2-dimethyl cyclopropane carboxylate.
4.
The pesticidal formulation of claim 3 wherein the (1R cis)S and (1S cisR) enantiomer isomer pair of alpha-cyano-3-phenoxybenzyl-3-(2,2-dichlorovinyl)-2,2-cimethylcyclopropane carboxylate constitutes more than 40% by mass of the total of all isomers of that compound present in the formulation
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Molecular Biology 
