Gargamuni Dasa: In 1968 Rayrama Dasa editor of Back to Godhead wanted to print ISKCON’S distaste for cow-slaughter by showing a man with cow-face slaughtering a cow with a man-face. Srila Prabhupada stopped this. Srila Prabhupada said depicting this picture is indirectly advertising cow-slaughter.
A man with cow-face slaughtering a cow with man-face
Reference: Facebook post of Gargamuni Dasa