However, there are two problems with marmoset
reproduction. The first is that marmosets have definite
mating preferences, as marmosets frequently display
incompatible sexual behavior when paired for mating [2,3].
Therefore, it is difficult to obtain offspring by crossingindividuals with interesting traits or genes. Second, handreared
males failed to copulate with other NHP including
marmosets [4–7]. We expect that these difficulties can be
overcome using artificial insemination (AI) and assisted
reproductive technology