“…From a practical standpoint of breeding, however, we think of several countermeasures that should be taken when laboratory-bred monkeys are defective in their mating and maternal behaviors. For a female monkey who can not 'copulate, artificial insemination is worth trying although its efficiency seems still low (Dede and Plentl, 1966;Valerio, Leverage and Munster, 1971;Peng, Lai and Yang, 1973;Settlage, Swan and Hendrickx, 1973;Cho, Honjo and Makita, 1975). For the baby monkey having been borne by a female who is defective in nursing behaviors, the first countermeasure is artificial nursing ) and the second is foster nursing (Cho and Honjo, unpublished data).…”