Authors : K.B.Nagarnaik
Abstract- The collecterial gland is a long thread-like enormously coiled structure Opning into the common oviduct. The colleterial gland is composed of a layer of columnar epithelial cells Which undergo cyclical changes during the reproductive phase. The lumen Is filled with secretory material. Oocyte development and vitellogenesis . The terminal oocytes of the ovarioles undergo gradual development Exhibiting successive five stages of vitellogenesis; pre-vitellogenic, Early-vitellogenic, mid –vitellogenic , late-vitellogenic and maturation stages.
