if sperm wasted on non human female bodies - Sāntapana Kṛcchra OR recite the Gayathri verse one thousand times

 Sāntapana Kṛcchra need to be done 

which is eating cow related items one day and fast on another day.

as per Parashara Smriti Chapter 12 Verse 63

63. If a householder willingly causes the discharge of his virile seed otherwise than in sexual intercourse, he should recite the Gayathri verse one thousand times, and should perform three Pranayamas.