Morphological and histological characteristics of ovaries from two genetic groups of guinea pigs (Cavia porcellus) from South America. [Características morfológicas e histológicas de los ovarios de dos grupos genéticos de cuyes (Cavia porcellus) de América del Sur].

ABSTRACT.- This study aimed to describe morphological and histological characteristics of ovaries of two genetic groups of guinea pigs from Latin America. Ovaries from 20 improved and 20 native guinea pigs were collected after slaughtering. One ovary from each animal was weighed, measured, counted for visible follicles on the ovarian surface, and used for subsequent oocyte collection by the slicing method. Contralateral ovaries were used to prepare histological sections and quantify follicles.