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Author: Pia Katrine Løtvedt
Publisher: Linköping University Electronic Press
ISBN: 9176853926
Category :
Languages : en
Pages : 30
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Book Description
A number of animal species have undergone domestication, the process of becoming adapted to living in captivity and in proximity to humans. Common for these species is that they have all developed certain traits, including changes to coat color, body size and level of fearfulness. This has been termed the domestic phenotype. Among these traits is also an attenuation of the response to stress, both behaviorally and physiologically. Thus, release of glucocorticoids such as cortisol or corticosterone is lower in domesticated species. However, the underlying mechanism for this is not yet well understood. In this thesis, we have investigated genetic mechanisms for the attenuation of the physiological stress response in ancestral chickens, the Red Junglefowl, and domesticated chickens, the White Leghorn. We found a number of genes that differed in expression between the two breeds in several tissues involved in the stress response. Among the most interesting findings were lower expression of genes involved in production and secretion of ACTH in the pituitary, and in the production of glucocorticoids in the adrenal glands, in the domesticated White Leghorns. We also found higher expression of the glucocorticoid receptor in White Leghorns, indicating that they may have a more efficient negative feedback of the physiological stress response. We then investigated the transcriptome of the chicken pituitary more closely, and we discovered that a number of genes highly involved in several important physiological axes showed differential expression between the ancestral and the domesticated breed. Among these were genes involved in the stress response, the reproductive system, and in metabolism and growth. As these traits are modified in domesticated species, our results suggest that changes to gene expression in the pituitary may be an important underlying factor of the domestic phenotype. A separate aim of this thesis was to investigate effects of hatching time in chickens on their subsequent phenotype. Time of hatching constitutes an early experience that may differ between individuals, and we therefore hypothesized that differences in hatching time would affect chickens later in life. While a number of studies have been performed on hatching time and post-hatch growth, very little work has been done on effects on behavior. We found that the time of hatching had sex-specific effects. Hatching times in females were negatively correlated with body weight, whereas in males, behaviors such as reaction to novelty and spatial learning were affected. As time of hatching is governed by various hormones, including thyroid hormone and corticosterone, we suggest that changes to the levels of these hormones could affect both hatching time and post-hatch phenotypes. Understanding these mechanisms better would be beneficial in terms of production, where batch homogeneity is important, in research on early experiences and the potential for maternal programming, and in evolutionary questions on trade-off between different life strategies.
Author: Pia Katrine Løtvedt
Publisher: Linköping University Electronic Press
ISBN: 9176853926
Category :
Languages : en
Pages : 30
Get Book Here
Book Description
A number of animal species have undergone domestication, the process of becoming adapted to living in captivity and in proximity to humans. Common for these species is that they have all developed certain traits, including changes to coat color, body size and level of fearfulness. This has been termed the domestic phenotype. Among these traits is also an attenuation of the response to stress, both behaviorally and physiologically. Thus, release of glucocorticoids such as cortisol or corticosterone is lower in domesticated species. However, the underlying mechanism for this is not yet well understood. In this thesis, we have investigated genetic mechanisms for the attenuation of the physiological stress response in ancestral chickens, the Red Junglefowl, and domesticated chickens, the White Leghorn. We found a number of genes that differed in expression between the two breeds in several tissues involved in the stress response. Among the most interesting findings were lower expression of genes involved in production and secretion of ACTH in the pituitary, and in the production of glucocorticoids in the adrenal glands, in the domesticated White Leghorns. We also found higher expression of the glucocorticoid receptor in White Leghorns, indicating that they may have a more efficient negative feedback of the physiological stress response. We then investigated the transcriptome of the chicken pituitary more closely, and we discovered that a number of genes highly involved in several important physiological axes showed differential expression between the ancestral and the domesticated breed. Among these were genes involved in the stress response, the reproductive system, and in metabolism and growth. As these traits are modified in domesticated species, our results suggest that changes to gene expression in the pituitary may be an important underlying factor of the domestic phenotype. A separate aim of this thesis was to investigate effects of hatching time in chickens on their subsequent phenotype. Time of hatching constitutes an early experience that may differ between individuals, and we therefore hypothesized that differences in hatching time would affect chickens later in life. While a number of studies have been performed on hatching time and post-hatch growth, very little work has been done on effects on behavior. We found that the time of hatching had sex-specific effects. Hatching times in females were negatively correlated with body weight, whereas in males, behaviors such as reaction to novelty and spatial learning were affected. As time of hatching is governed by various hormones, including thyroid hormone and corticosterone, we suggest that changes to the levels of these hormones could affect both hatching time and post-hatch phenotypes. Understanding these mechanisms better would be beneficial in terms of production, where batch homogeneity is important, in research on early experiences and the potential for maternal programming, and in evolutionary questions on trade-off between different life strategies.
Author: Temple Grandin
Publisher: Academic Press
ISBN: 0124055087
Category : Technology & Engineering
Languages : en
Pages : 496
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Book Description
Behavior is shaped by both genetics and experience--nature and nurture. This book synthesizes research from behavioral genetics and animal and veterinary science, bridging the gap between these fields. The objective is to show that principles of behavioral genetics have practical applications to agricultural and companion animals. The continuing domestication of animals is a complex process whose myriad impacts on animal behavior are commonly under-appreciated. Genetic factors play a significant role in both species-specific behaviors and behavioral differences exhibited by individuals in the same species. Leading authorities explore the impact of increased intensities of selection on domestic animal behavior. Rodents, cattle, pigs, sheep, horses, herding and guard dogs, and poultry are all included in these discussions of genetics and behavior, making this book useful to veterinarians, livestock producers, laboratory animal researchers and technicians, animal trainers and breeders, and any researcher interested in animal behavior. Includes four new chapters on dog and fox behavior, pig behavior, the effects of domestication and horse behavior Synthesizes research from behavioral genetics, animal science, and veterinary literature Broaches fields of behavior genetics and behavioral research Includes practical applications of principles discovered by behavioral genetics researchers Covers many species ranging from pigs, dogs, foxes, rodents, cattle, horses, and cats
Author: Andrew Lawler
Publisher: Simon and Schuster
ISBN: 1476729913
Category : History
Languages : en
Pages : 336
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Book Description
Veteran journalist Andrew Lawler delivers a “fascinating and delightful…globetrotting tour” (Wall Street Journal) with the animal that has been most crucial to the spread of civilization—the chicken. In a masterful combination of historical sleuthing and journalistic adventure, veteran reporter Andrew Lawler “opens a window on civilization, evolution, capitalism, and ethics” (New York) with a fascinating account of the most successful of all cross-species relationships—the partnership between human and chicken. This “splendid book full of obsessive travel and research in history” (Kirkus Reviews) explores how people through the ages embraced the chicken as a messenger of the gods, an all-purpose medicine, an emblem of resurrection, a powerful sex symbol, a gambling aid, a handy research tool, an inspiration for bravery, the epitome of evil, and, of course, the star of the world’s most famous joke. Queen Victoria was obsessed with the chicken. Socrates’s last words embraced it. Charles Darwin and Louis Pasteur used it for scientific breakthroughs. Religious leaders of all stripes have praised it. Now neuroscientists are uncovering signs of a deep intelligence that offers insights into human behavior. Trekking from the jungles of southeast Asia through the Middle East and beyond, Lawler discovers the secrets behind the fowl’s transformation from a shy, wild bird into an animal of astonishing versatility, capable of serving our species’ changing needs more than the horse, cow, or dog. The natural history of the chicken, and its role in entertainment, food history, and food politics, as well as the debate raging over animal welfare, comes to light in this “witty, conversational” (Booklist) volume.
Author: Colin G. Scanes
Publisher: Elsevier
ISBN: 0124072437
Category : Science
Languages : en
Pages : 1055
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Book Description
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
Author: Emelyn Rude
Publisher: Simon and Schuster
ISBN: 1681771985
Category : Cooking
Languages : en
Pages : 367
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Book Description
From the domestication of the bird nearly ten thousand years ago to its current status as our go-to meat, the history of this seemingly commonplace bird is anything but ordinary. How did chicken achieve the culinary ubiquity it enjoys today? It’s hard to imagine, but there was a point in history, not terribly long ago, that individual people each consumed less than ten pounds of chicken per year. Today, those numbers are strikingly different: we consumer nearly twenty-five times as much chicken as our great-grandparents did. Collectively, Americans devour 73.1 million pounds of chicken in a day, close to 8.6 billion birds per year. How did chicken rise from near-invisibility to being in seemingly "every pot," as per Herbert Hoover's famous promise? Emelyn Rude explores this fascinating phenomenon in Tastes Like Chicken. With meticulous research, Rude details the ascendancy of chicken from its humble origins to its centrality on grocery store shelves and in restaurants and kitchens. Along the way, she reveals startling key points in its history, such as the moment it was first stuffed and roasted by the Romans, how the ancients’ obsession with cockfighting helped the animal reach Western Europe, and how slavery contributed to the ubiquity of fried chicken today. In the spirit of Mark Kurlansky’s Cod and Bee Wilson's Consider the Fork, Tastes Like Chicken is a fascinating, clever, and surprising discourse on one of America’s favorite foods.
Author: Shahal Abbo
Publisher: Cambridge University Press
ISBN: 1108493645
Category : Social Science
Languages : en
Pages : 289
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Book Description
Rapid and knowledge-based agricultural origins and plant domestication in the Neolithic Near East gave rise to Western civilizations.
Author: Heinz Stephan
Publisher: Springer Science & Business Media
ISBN: 1461391245
Category : Medical
Languages : en
Pages : 575
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Book Description
This first volume in the series on "Comparative Brain Research in Mammals" deals with the brains of Insectivora. The importance of Insectivora lies above all in the fact that, (1) insectivore-like ancestors are regarded as the initial group for the evolution of higher mammals, and (2) the insectivore brains retained many conservative traits, though the animals have adapted to different living environments. Therefore, the study of Insectivora brains enables an insight into the size and composition of the brain structure of earlier ancestors of the higher mammals including primates and humans; in addition, it illumi nates the various evolutionary trends which made the successful adaptation to different biotopes possible. The alterations which the brain has experienced in the course of the phylo geny and the related adaptive radiation will be examined in the succeeding volumes on the brains of other Eutheria, e.g., bats (Volume 2) and primates (Volume 4). In Volume 3 the brains of marsupials will be compared with those of conservative and evolved Eutheria.
Author: Gail Damerow
Publisher: Storey Publishing
ISBN: 1603425616
Category : Technology & Engineering
Languages : en
Pages : 321
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Book Description
From addled to wind egg and crossed beak to zygote, the terminology of everything chicken is demystified in The Chicken Encyclopedia. Complete with breed descriptions, common medical concerns, and plenty of chicken trivia, this illustrated A-to-Z reference guide is both informative and entertaining. Covering tail types, breeding, molting, communication, and much more, Gail Damerow provides answers to all of your chicken questions and quandaries. Even seasoned chicken farmers are sure to discover new information about the multifaceted world of these fascinating birds.
Author:
Publisher:
ISBN: 9781430117223
Category :
Languages : en
Pages :
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Book Description
Read by Bonnie Kelley-Young From cuddly chick to mature hens and crowing roosters, the behavior, breeds and life cycles of these farmyard favorites is laid forth in this colorfully read, orderly presentation.
Author: Harry J. Jerison
Publisher: Springer Science & Business Media
ISBN: 3642708773
Category : Medical
Languages : en
Pages : 482
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Book Description
In evolutionary biology, "intelligence" must be defined in terms of traits that are subject to the major forces of organic evolution. Accordingly, this volume is concerned with the substantive questions that are relevant to the evolutionary problem. Comparisons of learning abilities are highlighted by a detailed report on similarities between honeybees and higher vertebrates. Several chapters are concerned with the evolution of cerebral lateralization and the control of language, and recent analyses of the evolution of encephalization and neocorticalization, including a review of effects of domestication on brain size are presented. The relationship between brain size and intelligence is debated vigorously. Most unusual, however, is the persistent concern with analytic and philosophical issues that arise in the study of this topic, from the applications of new developments on artificial intelligence as a source of cognitive theory, to the recognition of the evolutionary process itself as a theory of knowledge in "evolutionary epistemology".