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L10 Epidemiology & Animal Health

by: Yuran Liu

L10 Epidemiology & Animal Health ASCI 112

Yuran Liu
Cal Poly
GPA 3.67

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L10 Epidemiology & Animal Health
Principles of Animal Science
Professor Burroughs
Class Notes
25 ?




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This 3 page Class Notes was uploaded by Yuran Liu on Saturday May 7, 2016. The Class Notes belongs to ASCI 112 at California Polytechnic State University San Luis Obispo taught by Professor Burroughs in Spring 2016. Since its upload, it has received 9 views. For similar materials see Principles of Animal Science in Animal Science at California Polytechnic State University San Luis Obispo.

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Date Created: 05/07/16
Epidemiology & Animal Health ASCI 112 10/20  Epidemiology (流流流流)  “Study of the frequency, distribution, transmission, and determinants of health and disease in populations.”  Ex. A physician examining a patient; to an epidemiologist, the entire population of animals under consideration is that patient.  Population medicine  Ex. Swine 流 vs. Horse  Swine  Live closely  Large population in the barn  Can’t easily recognize the sick pig  Horse  Water or food  Parasite  Can’t know easily  The sick one will be isolated  Disease  dis + ease  “A particular destructive (流流流) process in an organism.”  Epidemiology triangle model  Whether disease arises is determined by the interplay between host factors, characteristics of disease agents, and the environment.  Host factors  Age  General health status (lameness)  Immunity  Nutrition  Stress  Agent factors  Type of agent: biologic  Bacteria  Virus  Prion (流流流流流流)  Parasite  Virulence (流流) of pathogen (流流流)  Environmental factors  Cleanliness  Stocking rate  Thermal stress  Extreme heat  Extreme cold  Humidity  Altitude  Radiation sunlight intensity level  Pollution, noise  Other types of disease agents (non-biologic causes)  Nutritional imbalances: excess, insufficiency  Ex. White Muscle Disease (流流流)  Aka nutritional myodegeneration (流流流)  Selenium (流) deficiency that causes necrosis (流流) of muscle tissue – muscle fibers die and are replaced by fat and scar tissue  Can be stopped by providing selenium supplement, but won’t reverse damage already done, so need to catch early  Stiffness (流流) progresses to weakness  Selenium excess: toxicosis (流流)  Causes abnormal hair and hooves (流): the latter become separated and shelly  Leads to hair loss, extreme lameness  Genetic diseases  Ex. Lethal (流流流) white disease in Paint Horse 马流流流流流流流流马流流流流流流流 foals  This condition arises when overo-pattern Paints are crossed with other overo-pattern Paints.  In a small percentage of those offspring, the foal lacks proper innervation (流流流流) of the GIT miss communication from nerve and …  Lack of melanocytes (流流流流)  Affects nervous system, particularly GI tract, unable to move food through the colon  Die of colonic obstruction (流流流流)  No cure  Ex. Junctional Epidermolysis bullosa (流流流流流流流流流流流)  Genetic disease in which the epidermis (流流)/integument (流流) has missing segments. 流流流流流流流流流流流  Clinical signs physical sign of not feeling well  A clinical sign is what the animal exhibits that is different from the normal function. Includes,  Fever  Weight loss  Edema (流流)  Reduced performance  The term “symptom” is used for humans  Pathophysiology (流流流流流)  The process by which a pathogen or disease-causing state disrupts normal function and health.  Examples  Pathophysiology of parvovirus (流流流流) in a dog  Bloody diarrhea (流流) because virus causes colon 流流 lining 流流流流 to slough 流流 off, so can’t absorb anything 流流流流  Colon can fix itself in 7-10 days, so if can provide IV fluids/nutrients dog can be saved  Pathophysiology of anthrax (流流) in a cow  Rabies in spinal cord  Subclinical disease  Subclinical = disease that flies under the radar; not manifested (流流) as full-blown (流流) illness  In most instances, subclinical disease is more prevalent (流流) than clinical disease  Subclinical disease causes more overall morbidity (流流), loss production, and economic loss than clinical disease


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