Lewis & Short

căprĭgĕnus, a um, adj. [caper-gigno], proceeding from a goat, of the goat kind (poet.): genus, Pac. ap. Macr. S. 6, 5; and ap. Prisc. p. 677 P.: pecu, Cic. Progn. Fragm. ap. Prisc. l. l.
Subst.: căprĭgĕni, ae, goats, = capri, ae: caprigenum ( = caprigenorum or -arum) trita ungulis, Att. ap. Macr. S. l. l. (Trag. Rel. v. 544 Rib.): caprigenum pecus, Verg. A. 3, 221; cf. Prisc. l. l.
To the sickliness of the goat (cf. Varr. R. R. 2, 3, 5; Plin. 8, 50, 76, § 202) Plautus refers humorously, Ep. 1, 1, 16.