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Author: Pia Katrine Løtvedt Publisher: Linköping University Electronic Press ISBN: 9176853926 Category : Languages : en Pages : 42
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 : 42
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
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: Emelyn Rude Publisher: Simon and Schuster ISBN: 1681771985 Category : Cooking Languages : en Pages : 367
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: Colin G. Scanes Publisher: Elsevier ISBN: 0124072437 Category : Science Languages : en Pages : 1055
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: Andrew Lawler Publisher: Simon and Schuster ISBN: 1476729913 Category : History Languages : en Pages : 336
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: Gail Damerow Publisher: Storey Publishing ISBN: 1603425616 Category : Technology & Engineering Languages : en Pages : 321
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: Michael C. Appleby Publisher: CABI ISBN: 0851996671 Category : Science Languages : en Pages : 288
Book Description
This authoritative textbook provides an introduction and guide to poultry behavior and welfare. It describes the origin and biology of the various species of bird that are of agricultural importance, as well as giving a succinct overview of their key behavior patterns. There is careful discussion of the many factors that influence their welfare, and detailed consideration of the ways in which legislation and commercial interests interact in an attempt to satisfy the many needs involved. The final chapters discuss possible future developments within the subject. The book is in part an update of a previous work, Poultry Production Systems: Behaviour, Management and Welfare (CABI, 1992), completely rewritten and with much new material added.
Author: Maria Lundström Publisher: Linköping University Electronic Press ISBN: 917685194X Category : Languages : en Pages : 59
Book Description
Crop plants have undergone a multitude of genetic changes during and following their domestication. The spread of agriculture brought the crops to new geographic regions exposing them to new environments and selection pressures along the way. This gave rise to many local variants with traits favoured both by agricultural practices and the environment. Agriculture was introduced in Fennoscandia (Norway, Sweden, Finland and Denmark) around 4000 BC. The composition of the archaeobotanical record gives some clues as to which species were cultivated, but macroscale analyses rarely reach beyond that. Therefore, methods like genetic analysis are necessary to expand our knowledge about the history of crop cultivation. Under optimal conditions, DNA can survive in biological samples for several hundred thousand years. The preservation of plant specimens in the Fennoscandian climate has, however, rarely been explored. This thesis therefore attempts to dive deeper into the Fennoscandian cultivation history through genetic analyses of aged plant materials from both museum collections and archaeological sources. Cereal grains from a range of preservation conditions were evaluated to find which ones might be of interest for genetic investigations. Desiccated materials gave the highest success rates, in agreement with previous studies. Waterlogged materials appeared to contain small amounts of endogenous DNA, whereas genetic analysis of charred cereals failed completely in all samples. Population structure was investigated in 17-19th century materials of both barley and rye from Sweden and Finland. Northern and southern populations of Finnish six-row barley were distinct from one another. In southern Sweden, genetic analysis suggested conserved population structure extending over 200 years. The genetic composition of rye also seemed mostly conserved, but rye did not show geographic population structure across the investigated region in Sweden and Finland. A long-standing question in Fennoscandian crop history has been the interpretation of historical written records mentioning Brassica (cole crops, turnips and mustards), as well as the species identity of archaeobotanical finds of Brassica seeds. Thus, Next Generation Sequencing (NGS) was applied to identify which Brassica types that were cultivated in 17th century Kalmar, Sweden. The analysis corroborated morphological species classification in two of the investigated subfossil seeds, whereas no conclusions could be drawn from the remaining samples. The genome coverages were too low to allow subspecies identification. Wheat has been cultivated in Fennoscandia since the introduction of agriculture but has increased dramatically in importance over the last century. The functional allele of the wheat nutrition gene NAM-B1 was found to be particularly prominent in Fennoscandian wheats, likely associated with its effect on grain maturation time. Here the evolutionary history of NAM-B1 was investigated to see if it could truly be considered a domestication gene as suggested in a previous study. By studying extant landrace materials of Mediterranean tetraploid wheat, it was found that the non-functional allele showed signs indicative of a selective sweep. This selection did not, however, appear to have occurred during domestication. In conclusion, aged plant specimens from both museum and archaeological contexts could contribute greatly to our knowledge about historical cultivation, extending the investigated period into the mid 17th century. Subfossil and waterlogged archaeobotanical materials do contain endogenous DNA, suggesting that they are better suited for genetic analysis than charred ones, at least as far as cereals are concerned. There is potential for classifying archaeological Brassica remains using NGS, even though further optimisation of sample and library preparation may be necessary. And finally, despite NAM-B1 showing signs of selection it should not be considered a domestication gene in tetraploid wheat.
Author: Pia Katrine Løtvedt
Author: Pia Katrine Løtvedt
Author: Temple Grandin
Author: Emelyn Rude
Author: Colin G. Scanes
Author: Andrew Lawler
Author: Shahal Abbo
Author: Gail Damerow
Author: John H. Robinson
Author: Michael C. Appleby
Author: Maria Lundström