It is illegal to have sex with a cow.

Sec. 8-131. Crime against nature.

Crime against nature is unlawful and is:

(1) The unnatural carnal copulation by a human being with another of the same sex or opposite sex or with an animal, except that anal sexual intercourse between two (2) human beings shall not be deemed as a crime against nature when done under any of the circumstances described in R.S. 14:41, 14:42, 14:42.1 or 14:43. Emission is not necessary; and, when committed by a human being with another, the use of the genital organ of one of the offenders of whatever sex is sufficient to constitute the crime.

(2) The solicitation by a human being of another with the intent to engage in any unnatural carnal copulation for compensation.