Ninety-eight diseases came by killing cows (snp 2.7)

What more to say after that because killing other animals.

Then devas, antigods, demons, led
by Indra, even the ancestors,
cried out “Against the Dharma is all this!”
while fell the sword upon the cows.

In former times three ills were found:
desire and hunger and decay;
but due to the killing of cattle,
ninety-eight diseases came.