In June 1964, Fidel Castro extended an invitation to Voisin to deliver a series of lectures at the University of Havana in Cuba on the subject of Rational Grazing. Despite the negative perception in Europe of Castro's communist government, Voisin agreed. He and his wife arrived in Cuba on 3 December, and were personally greeted by Castro at Jose Marti Airport. Castro and Voisin, as well as numerous dignitaries, then led an inspection of a nearby farm owned by the Cuban Prime Minister.
