We used to buy cottonseed cake to feed our cows. None of them fell over dead.
I don’t know about other areas of the US, but just about every cow in the south and in Texas has been fed cottonseed. There is nothing poison about it. Last year it was very expensive and fed a bit less, but it is high nutrition for cattle.
Most seed oils are toxic to protect the seed from pest. Cotton gets an extra dosing from the additional pesticides applied by the grower.
If the raw oil is processed to remove the natural and added pesticides, the resulting fractured product often becomes toxic in other ways. Sometimes by changes in the structure from high heat, dehydrogenation or by the addition of catalyst, rehydrogenation, bleaching, coloring, perfuming, etc.
Cottonseed oil is one of the highest polyunsaturated oils, which are immune system suppressors.
Use at your own peril!