The Ovarian Cycle in Vertebrates

摘要: Publisher Summary This chapter provides an overview of the studies ovarian activity in reproductive cycle species. The distinction between cycles mammals and those other vertebrates is common. fishes lower consists only follicular phase that found because a majority these animals are either oviparous or ovoviviparous have no need corpus luteum for purpose it serves mammals. occurrence corpora lutea not unknown quite wide selection correlate viviparous habit. processes extremely diverse, partly on account their great phylogenetic age freedom structures from demands organs systems. discusses cyclostomes fishes. A amphibians oviparous, fertilization external. Temperate zone species spend winter months torpid state until emergence following spring. changes resulting growth, development, ovulation occupy several up to time spawning sharp contrast very rapid loss weight follows ovulation.