Author: Saidou Tembely
Publisher:
ISBN:
Category : Helminths
Languages : en
Pages : 170
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Book Description
ABSTRACT: An experiment was conducted at the Texas Range field station at Barnhart, to investigate the effects of different grazing systems on transmission of gastrointestinal nematodes of sheep. Groups of three 30-40 kg Rambouillet lambs raised in parasite-free condition were grazed with sheep and cattle during various periods of the year on switchback, Merrill 4-pasture, intensive and continuous grazing systems. The effects of these treatments on the transmission of free-living larvae from pastures to lambs were assessed by worm counts of lambs which grazed the paddocks. The results were analyzed by Duncan's multiple range test after logarithmic transformation. There was little effect of any treatment on numbers of Haemonchus contortus or Trichostrongylus axei, and except for the intensive system and Nematodirus spp. There was no significant difference between the worm counts of the various groups after exposure, it was concluded that, in general, any grazing system might be utilized without special recommendations. Because intensive system did not increase the chance of greater transmission, it would be advantageous for greater pasture utilization. Precipitation was the principal environmental factor influencing larvae transmission. Hematological and serological studies gave values within the normal range although there was a slight inverse correlation between worm counts and packed cell voulme.
Author:
Publisher:
ISBN:
Category : Ruminants
Languages : en
Pages : 184
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Book Description
Author: Elżbieta Kalisińska
Publisher: Springer
ISBN: 3030001210
Category : Science
Languages : en
Pages : 708
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Book Description
The population explosion that began in the 1960s has been accompanied by a decrease in the quality of the natural environment, e.g. pollution of the air, water and soil with essential and toxic trace elements. Numerous poisonings of people and animals with highly toxic anthropogenic Hg and Cd in the 20th century prompted the creation of the abiotic environment, mainly in developed countries. However, the system is insufficient for long-term exposure to low concentrations of various substances that are mainly ingested through food and water. This problem could be addressed by the monitoring of sentinels – organisms that accumulate trace elements and as such reflect the rate and degree of environmental pollution. Usually these are long-lived vertebrates – herbivorous, omnivorous and carnivorous birds and mammals, especially game species. This book describes the responses of the sentinels most commonly used in ecotoxicological studies to 17 trace elements.
Author: Ilkka Hanski
Publisher: Princeton University Press
ISBN: 1400862094
Category : Science
Languages : fr
Pages : 514
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Book Description
In many ecosystems dung beetles play a crucial role--both ecologically and economically--in the decomposition of large herbivore dung. Their activities provide scientists with an excellent opportunity to explore biological community dynamics. This collection of essays offers a concise account of the population and community ecology of dung beetles worldwide, with an emphasis on comparisons between arctic, temperate, and tropical species assemblages. Useful insights arise from relating the vast differences in species' life histories to their population and community-level consequences. The authors also discuss changes in dung beetle faunas due to human-caused habitat alteration and examine the possible effects of introducing dung beetles to cattle-breeding areas that lack efficient native species. "With the expansion of cattle breeding areas, the ecology of dung beetles is a subject of great economic concern as well as one of intense theoretical interest. This excellent book represents an up-to-date ecological study covering important aspects of the dung beetle never before presented."--Gonzalo Halffter, Instituto de Ecologia, Mexico City Originally published in 1991. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Author: Lee Russell McDowell
Publisher: John Wiley & Sons
ISBN: 0470376686
Category : Medical
Languages : en
Pages : 793
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Book Description
Vitamins in Animal and Human Nutrition contains concise, up-to-date information on vitamin nutrition for both animals and humans. The author defines these nutrients and describes their fascinating discovery, history and relationship to various diseases and deficiencies. Discussion of vitamins also includes their chemical structure, properties and antagonists; analytical procedures; metabolism; functions; requirements; sources; supplementation and toxicity. Vitamin-like substances, essential fatty acids and vitamin supplementation considerations are also examined. This book will be useful worldwide as a textbook and as an authoritative reference for research and extension specialists, feed manufacturers, teachers, students and others. It provides a well-balanced approach to both animal and clinical human nutrition and compares chemical, metabolic and functional aspects of vitamins and their practical and applied considerations. A unique feature of the book is its description of the implications of vitamin deficiencies and excesses and the conditions that might occur in human and various animal species.
Author: Arun K. Bhunia
Publisher: Springer
ISBN: 1493973495
Category : Technology & Engineering
Languages : en
Pages : 377
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Book Description
This book primarily covers the general description of foodborne pathogens and their mechanisms of pathogenesis, control and prevention, and detection strategies, with easy-to-comprehend illustrations. The book is an essential resource for food microbiology graduate or undergraduate students, microbiology professionals, and academicians involved in food microbiology, food safety, and food defense-related research or teaching. This new edition covers the significant progress that has been made since 2008 in understanding the pathogenic mechanism of some common foodborne pathogens, and the host-pathogen interaction. Foodborne and food-associated zoonotic pathogens, responsible for high rates of mortality and morbidity, are discussed in detail. Chapters on foodborne viruses, parasites, molds and mycotoxins, and fish and shellfish are expanded. Additionally, chapters on opportunistic and emerging foodborne pathogens including Nipah virus, Ebola virus, Aeromonas hydrophila, Brucella abortus, Clostridium difficile, Cronobacter sakazakii, and Plesiomonas shigelloides have been added. The second edition contains more line drawings, color photographs, and hand-drawn illustrations.
Author: Forage and Grassland Terminology Committee
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 52
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Book Description
Two years in the making, this book represents the combined effort of scientists in Australia, New Zealand, and the United States and of some 16 organizations and agencies including the American Forage and Grassland Council. It has been adopted by these 16 and numerous other organizations world-wide as the definitive standard for word usage in the science.
Author: Bal Ram Singh
Publisher: Springer Nature
ISBN: 3030375374
Category : Science
Languages : en
Pages : 624
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Book Description
This book discusses knowledge-based sustainable agro-ecological and natural resource management systems and best practices for sustained agricultural productivity and ecosystem resilience for better livelihoods under a changing climate. With a focus on agriculture in Africa, the book assesses innovative technologies for use on smallholder farms, and addresses some of the key Sustainable Development Goals to guide innovative responses and enhanced adaptation methods for coping with climate change. Contributions are based on 'Capacity Building for Managing Climate Change in Malawi' (CABMACC), a five-year program with an overall goal to improve livelihoods and food security through innovative responses and enhanced capacity of adaptation to climate change. Readers will discover more about sustainable crop production, climate smart agriculture, on-farm energy supply from biogas and the potential of soil carbon sequestration in crop-livestock systems.
Author: Frédéric Angleviel
Publisher: Presses Univ de Bordeaux
ISBN: 9782905081179
Category : Dissertations, Academic
Languages : fr
Pages : 294
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Book Description
Author: Edelstein
Publisher: Jones & Bartlett Learning
ISBN: 1284122301
Category : Medical
Languages : en
Pages : 705
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Book Description
The science of food is discussed within the broader context of the world’s food supply. Food Science, An Ecological Approach explores the idea of global sustainability and examines the ecological problems that challenge our food supply and raise increasing concerns among consumers.
