Email: rsamaral gmail. The Amazonian manatee Trichechus inunguis is a threatened aquatic mammal endemic to the Amazon basin.
The aim of this study was to evaluate the urinary and salivary reproductive hormone levels of captive Amazonian manatees collected during two seasons of the year. Salivary samples from four males and urinary and salivary samples from three females were collected during two seasons March—June and September—November over two consecutive years.
Salivary testosterone in males was measured by radioimmunoassay and reproductive hormones in females salivary progesterone and oestradiol and urinary progestogens, oestrogens and luteinising hormone were measured by enzyme immunoassay.
There was no effect of year or season for salivary testosterone. These results strongly indicate the existence of reproductive seasonality in Amazonian manatees; however, apparently only females exhibit reproductive quiescence during the non-breeding season. Further long-term studies are necessary to elucidate which environmental parameters are related to reproductive seasonality in T.
These are the volumes that every graduate student or postdoctoral fellow in reproduction should have and probably would love to receive for Christmas. Zustand: Neu.
Book chapterFull text access Two gametes can then undergo fertilization to produce an embryo that is restored to diploid chromosome status. and maturative phases include (1) the acquisition of competencies to initiate and complete the. Help. Cover for Knobil and Neill's Physiology of Reproduction VOLUME 1 . Both epididymal epithelial cells and spermatozoa in the lumen are targets for.
In the decade since the publication of the last edition, the study of reproductive physiology has undergone monumental changes. Chief among these advances are in the areas of stem cell development, signaling pathways, the role of inflammation in the regulatory processes in the various tissues, and the integration of new animal models which have led to a greater understanding of human disease. The new edition synthesizes all of this new information at the molecular, cellular, and organismal levels of organization and present modern physiology a more understandable and comparative context.
The Fourth Edition has been extensively revised, reflecting new fundamental advancements in this rapidly advancing field.
Provides a common language for researchers across the fields of physiology, endocrinology, and biology to discuss their understanding of reproduction. Saves academic researchers time in quickly accessing the very latest details on reproductive physiology, as opposed to searching through thousands of journal articles.