Download or read book The Effect of Clutch Size on Prolactin Testosterone and Incubation Persistence in Male Wilson s Phalaropes Phalaropus Tricolor written by David J. Delehanty and published by . This book was released on 1991 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Birds of North America written by and published by . This book was released on 1994 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prolactin and Avian Clutch Size written by Calen Patrick Ryan and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clutch size is a fundamental predictor of avian fitness, and has been widely studied from evolutionary and ecological perspectives. However, surprisingly little is known about the physiological mechanisms that integrate environmental and state dependant cues into individually variable responses in clutch size. The only formal mechanistic hypothesis for avian clutch-size determination predicts an anti-gonadal effect of prolactin (PRL) via the inhibition of luteinizing hormone (LH), and has become widely accepted despite little experimental support. I experimentally tested the PRL-based mechanistic model for clutch size determination in an avian model system, Taeniopygia guttata using two complementary approaches. The first involved the pharmacological manipulation of PRL, while the second entailed experimentally enlarging clutch size. Contrary to predictions based on the PRL-based mechanistic model, PRL, LH and clutch size were effectively uncoupled through experimental manipulation. These findings expose a serious gap in our understanding of the physiological mechanisms of clutch size, a key life history trait.
Download or read book Sex Hormones and Prolactin in Phalaropes in Relation to Plumage and Behavioral Sex Dimorphism written by Su Chiau Cheng and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken to investigate the endocrine factors involved in the natural occurrence of more colorful nuptial plumage in female than male, as well as the sexual reversal in courtship and aggressive behavior and incubation, in phalaropes. Five steroids were separated from the gonadal extracts of Wilson's phalaropes and five other species of birds by the method of paper chromatography followed by colorimetric determination. Pituitary prolactin content of male and female breeding phalaropes was determined by the pigeon crop-sac test and by cyto- logical study. Relative pituitary weights of breeding phalaropes and two other species of birds were also recorded . The levels of gonadal steroid secretion was seen to be reflected by the difference in gonadal steroid hormone content of breeding and non breeding mallards. Relatively higher ovarian testosterone content per unit body weight than in the testes of conspecific male phalaropes, and a higher ovarian testosterone/estradiol ratio in phalaropes than in the other species examined were observed. These observations taken in conjunction with the experimental finding of others that androgens but not estrogens can induce the formation of nuptial feathers in phalaropes of either sex explain the formation of the brighter nuptial plumage in female than male phalaropes. On the basis of the general dependence of aggressive behavior on androgens in most birds, the observations on gonadal steroid hormone content also explain the greater aggressive behavior of female than male phalaropes. Observation of a higher estrogen content in testes of breeding than non breeding mallards supports the hypothesis of estrogen control of the male eclipse plumage in mallards. Prolactin like action shown only by the male not female pituitaries of Wilson's phalaropes together with the observation of a greater number of acidophils per unit area of adenohypophysis in male than in female Northern phalaropes explain the fact that only the male phalaropes form incubation patches, incubate and brood the young, since it has been demonstrated that only the synergistic action of prolactin and testosterone but not estrogen can induce the formation of incubation patches in phalaropes, and that prolactin induces the broodiness in certain birds. Indirect evidence for this view came from the observation of sex differences in pituitary weights of Wilson's phalaropes, Redwinged Blackbirds and Killdeers in relation to the incidence in these species of brood patch formation in one or both sexes.
Download or read book Sturkie s Avian Physiology written by G. Causey Whittow and published by Elsevier. This book was released on 1999-10-14 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sturkie's Avian Physiology is the classic comprehensive single volume on the physiology of domestic as well as wild birds. The Fifth Edition is thoroughly revised and updated, and includes new chapters on the physiology of incubation and growth. Chapters on the nervous system and sensory organs have been greatly expanded due to the many recent advances in the field. The text also covers the physiology of flight, reproduction in both male and female birds, and the immunophysiology of birds. The Fifth Edition, like the earlier editions, is a must for anyone interested in comparative physiology, poultry science, veterinary medicine, and related fields. This volume establishes the standard for those who need the latest and best information on the physiology of birds. - Thoroughly updated and revised - Coverage of both domestic and wild birds - New larger format - Only comprehensive, single volume devoted to birds
Download or read book Vertebrate Endocrinology written by David O. Norris and published by Academic Press. This book was released on 2013-05-04 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertebrate Endocrinology represents more than just a treatment of the endocrine system-it integrates hormones with other chemical bioregulatory agents not classically included with the endocrine system. It provides a complete overview of the endocrine system of vertebrates by first emphasizing the mammalian system as the basis of most terminology and understanding of endocrine mechanisms and then applies that to non-mammals. The serious reader will gain both an understanding of the intricate relationships among all of the body systems and their regulation by hormones and other bioregulators, but also a sense of their development through evolutionary time as well as the roles of hormones at different stages of an animal's life cycle. - Includes new full color format includes over 450 full color, completely redrawn image - Features a companion web site hosting all images from the book as PPT slides and .jpeg files - Presents completedly updated and revitalized content with new chapters, such as Endocrine Disrupters and Behavioral Endocrinology - Offers new clinical correlation vignettes throughout
Download or read book Comparative Anatomy and Histology written by Piper M. Treuting and published by Academic Press. This book was released on 2017-08-29 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Comparative Anatomy and Histology is aimed at the new rodent investigator as well as medical and veterinary pathologists who need to expand their knowledge base into comparative anatomy and histology. It guides the reader through normal mouse and rat anatomy and histology using direct comparison to the human. The side by side comparison of mouse, rat, and human tissues highlight the unique biology of the rodents, which has great impact on the validation of rodent models of human disease. - Offers the only comprehensive source for comparing mouse, rat, and human anatomy and histology through over 1500 full-color images, in one reference work - Enables human and veterinary pathologists to examine tissue samples with greater accuracy and confidence - Teaches biomedical researchers to examine the histologic changes in their model rodents - Experts from both human and veterinary fields take readers through each organ system in a side-by-side comparative approach to anatomy and histology - human Netter anatomy images along with Netter-style rodent images
Download or read book Sturkie s Avian Physiology written by Colin G. Scanes and published by Elsevier. This book was released on 2014-06-30 with total page 1055 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sturkie's Avian Physiology is the classic comprehensive single volume on the physiology of domestic as well as wild birds. The Sixth Edition is thoroughly revised and updated, and features several new chapters with entirely new content on such topics as migration, genomics and epigenetics. Chapters throughout have been greatly expanded due to the many recent advances in the field. The text also covers the physiology of flight, reproduction in both male and female birds, and the immunophysiology of birds. The Sixth Edition, like the earlier editions, is a must for anyone interested in comparative physiology, poultry science, veterinary medicine, and related fields. This volume establishes the standard for those who need the latest and best information on the physiology of birds. - Includes new chapters on endocrine disruptors, magnetoreception, genomics, proteomics, mitochondria, control of food intake, molting, stress, the avian endocrine system, bone, the metabolic demands of migration, behavior and control of body temperature - Features extensively revised chapters on the cardiovascular system, pancreatic hormones, respiration, pineal gland, pituitary gland, thyroid, adrenal gland, muscle, gastro-intestinal physiology, incubation, circadian rhythms, annual cycles, flight, the avian immune system, embryo physiology and control of calcium - Stands out as the only comprehensive, single volume devoted to bird physiology - Offers a full consideration of both blood and avian metabolism on the companion website (http://booksite.elsevier.com/ 9780124071605). Tables feature hematological and serum biochemical parameters together with circulating concentrations of glucose in more than 200 different species of wild birds
Download or read book Bound Lives written by Rachel Sarah O'Toole and published by University of Pittsburgh Pre. This book was released on 2012-04-15 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bound Lives chronicles the lived experience of race relations in northern coastal Peru during the colonial era. Rachel Sarah O'Toole examines how Andeans and Africans negotiated and employed casta, and in doing so, constructed these racial categories. Royal and viceregal authorities separated "Indians" from "blacks" by defining each to specific labor demands. Casta categories did the work of race, yet, not all casta categories did the same type of work since Andeans, Africans, and their descendants were bound by their locations within colonialism and slavery. The secular colonial legal system clearly favored indigenous populations. Andeans were afforded greater protections as "threatened" native vassals. Despite this, in the 1640s during the rise of sugar production, Andeans were driven from their assigned colonial towns and communal property by a land privatization program. Andeans did not disappear, however; they worked as artisans, muleteers, and laborers for hire. By the late seventeenth and early eighteenth centuries, Andeans employed their legal status as Indians to defend their prerogatives to political representation that included the policing of Africans. As rural slaves, Africans often found themselves outside the bounds of secular law and subject to the judgments of local slaveholding authorities. Africans therefore developed a rhetoric of valuation within the market and claimed new kinships to protect themselves in disputes with their captors and in slave-trading negotiations. Africans countered slaveholders' claims on their time, overt supervision of their labor, and control of their rest moments by invoking customary practices. Bound Lives offers an entirely new perspective on racial identities in colonial Peru. It highlights the tenuous interactions of colonial authorities, indigenous communities, and enslaved populations and shows how the interplay between colonial law and daily practice shaped the nature of colonialism and slavery.
Download or read book Trichier written by Alessandra Ceretto and published by Lulu.com. This book was released on with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Endocrinology written by I. Assenmacher and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: From 11 to 15 July 1977 about 60 physiologists, endo crinologists, ecologists and other biologists from 14 countries convened at the University Montpellier for a symposium on Environmental Endocrinology. This meet ing was organized as a Satellite Symposium of the 27th International Congress of Physiological Sciences, Paris, 18-23 July 1977. This volume is a record of the com munications presented at the symposium. The objectives of the program were to examine the role of the endocrine system in a wide spectrum of adjustments and adaptations to changes in environmental conditions by various spe cies of animals, including man, and to promote an ex change of ideas among investigators who have approached these functions from diverse aspects. The diversity of the information and ideas communicated is great. Of necessity, they represent only an extremely modest se lection of the many facets of endocrine function in the interaction of animals with their environments. Be yond the usefulness of the communications individually, we hope that they collectively demonstrate the substan tial heuristic value of the concept of environmental endocrinology as it was perceived by the participants. We acknowledge gratefully the kindness and sympathy of Professor Jaques ROUZAUD, President of the University of Montpellier II, for his generous extension of the hospitality of the University to the Symposium. We are most grateful to Mrs. Monique VIEU who effected so well the secretarial organization of the Sympos.
Download or read book Sheep Goat and Cervid Medicine E Book written by David G. Pugh and published by Elsevier Health Sciences. This book was released on 2020-01-07 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: **Selected for Doody's Core Titles® 2024 in Veterinary Medicine** Get practical answers from the only guide on the care of sheep, goats, and cervids! Authoritative yet easy to read, Sheep, Goat and Cervid Medicine, 3rd Edition covers all the latest advances in the field, including diseases and medical treatment, surgery, pain management, theriogenology, and nutrition. Clear instructions and hundreds of full-color photographs guide you step by step through common procedures including restraint for examination, administration of drugs, blood collection, and grooming. New to this edition is coverage of deer and elk medicine, reflecting the growing interest in these ruminants. Written by an expert team led by Dr. D.G. Pugh, this comprehensive reference is ideal for veterinarians and also for owners of sheep and goats. - Clear writing style and consistent organization makes the book easy to understand and use, with disease chapters including pathogenesis, clinical signs, diagnosis, treatment, and prevention. - Coverage of both surgery and medicine in each body systems chapter makes it easier to choose between treatment options for specific disorders. - Superbly illustrated surgical procedures clearly demonstrate the steps to follow in performing medical and reproductive surgery. - Diverse, expert contributors include the most experienced authorities, each providing current information on the care of valuable breeding stock as well as pets. - Useful appendixes, now including veterinary feed directives, offer convenient access to information on drugs and drug dosages, fluid therapy, and normal values and conversions. - Consistent, logical format in each body systems chapter makes information easy to find by beginning with physical examination and diagnostic procedures, followed by discussions of common diseases that involve the system. - Comprehensive Feeding and Nutrition chapter covers diet evaluation, method of balancing rations, total parenteral nutrition, and examples of nutritious diets. - Explanation of the differences in normal behavior between sheep and goats shows how they are not the same, and require different methods of treatment. - NEW! Coverage of cervids has been added to chapters throughout the book, reflecting the growing popularity of deer and elk. - NEW! Thorough content updates are made throughout the book and reflect the latest research evidence. - NEW! 170 new clinical photos have been added. - NEW! Anesthesia and Pain Management chapter includes a new section on pain management strategies, reflecting the emphasis on controlling pain in small ruminants. - NEW! Expert Consult website offers an online version of the book, making it easy to search the entire book electronically. - NEW! Two new authors are respected and well-known veterinary medicine experts and educators: Dr. Misty Edmondson and Dr. Thomas Passler.
Download or read book Civil Censorship written by United States. Department of the Army and published by . This book was released on 1981 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mader s Reptile and Amphibian Medicine and Surgery E Book written by Stephen J. Divers and published by Elsevier Health Sciences. This book was released on 2018-11-30 with total page 1793 pages. Available in PDF, EPUB and Kindle. Book excerpt: **Selected for Doody's Core Titles® 2024 in Veterinary Medicine** Known as "the bible" of herpetological medicine and surgery, Mader's Reptile and Amphibian Medicine and Surgery, 3rd Edition edited by Stephen Divers and Scott Stahl provides a complete veterinary reference for reptiles and amphibians, including specific sections on practice management and development; taxonomy, anatomy, physiology, behavior, stress and welfare; captive husbandry and management including nutrition, heating and lighting; infectious diseases and laboratory sciences; clinical techniques and procedures; sedation, anesthesia and analgesia; diagnostic imaging; endoscopy; medicine; surgery; therapy; differential diagnoses by clinical signs; specific disease/condition summaries; population health and public health; and legal topics. Well-organized and concise, this new edition covers just about everything related to reptiles and amphibians by utilizing an international array of contributing authors that were selected based on their recognized specialization and expertise, bringing a truly global perspective to this essential text!
Download or read book Armed Forces Censorship written by United States. Department of the Army and published by . This book was released on 1964 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Avian Myology written by John Caleekal George and published by . This book was released on 1966 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Auks written by Anthony J. Gaston and published by Oxford University Press, USA. This book was released on 1998 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: The auks are marine birds widespread in the cooler parts of northern seas. Often regarded as the northern hemisphere's counterparts to penguins, they are accomplished underwater swimmers, able to dive to great depths. Among bird families, they exhibit an unusual degree of variability in their breeding sites, which range from old-growth, temperate forests to barren sea-cliffs and rocky outcrops among mountain glaciers. Chick development is equally variable: in some species chicks leave for the sea soon after hatching, while in others they grow to full size at the nest site. This diversity of behavior makes the auks an excellent subject for the study of adaptation. The authors, who have extensive field experience with auks, provide descriptions of the major features of the family and an engaging discussion of the adaptive significance of various traits. Part I contains general chapters on auk evolution, ecology, behavior, chick development, populations, and conservation. These chapters are illustrated with black-and-white drawings, summary graphs and tables. Part II follows with the twenty-three species accounts, giving comprehensive information on the birds in their natural state, including distribution maps. All species are illustrated in color, in superb plates by Ian Lewington especially commissioned for this volume. The Auks is part of Oxford's multi-volume Bird Families of the World, a new series of handbooks for professional scientists and amateur ornithologists. Each volume gives a comprehensive synthesis of current knowledge on one bird family or several related families; the complete series will be the definitive source for information on species of birds.
