Disease Predisposing Factors
Bayani Gaba-gaba
Two poultry farms near Oyo keep the same breed of bird, buy feed from the same market and sit less than a kilometre apart. When Newcastle disease reaches the area, one farm loses a third of its flock and the other loses almost nothing. The birds are not different, and the pathogen is not different. What is different is everything that made one flock's defences weaker and one flock's exposure higher long before the virus ever arrived. Those conditions are called disease predisposing factors, and they explain more about who falls sick on a farm than the pathogen itself ever does.
In this lesson you will learn what a predisposing factor is and how it differs from the actual cause of a disease, then work through six factors examiners return to every year: nutrition, housing, stress, hygiene, genetics and age, and the absence of vaccination or parasite control. For each one you will learn not just its name but the mechanism, exactly how it tips an animal toward disease, and the practical steps a farmer takes to close that door.
Manufura
- Define disease predisposing factors
- State the factors that predispose farm animals to disease
- Explain how poor nutrition predisposes animals to disease
- Explain how poor housing and management predispose animals to disease
- Suggest ways of reducing disease predisposing factors on a farm
Takardar Darasi
Yi Rijista don Ci Gaba
Ƙirƙiri asusu kyauta don samun damar duk kayan koyo, tambayoyin atisaye, da kuma bibiyar ci gaban ka.
Nazarin Darasi
Barka da kammala darasi akan Disease Predisposing Factors. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which of the following is a disease predisposing factor rather than the actual cause of disease? A. A bacterium B. A virus C. An overcrowded, poorly ventilated house D. A parasitic worm Answer: C
- Sustained stress increases an animal's susceptibility to disease mainly by: A. Increasing its appetite B. Raising a hormone level that suppresses immune function C. Improving its body temperature regulation D. Strengthening its skin Answer: B
- Day old chicks are more susceptible to disease than adult birds chiefly because: A. They eat more feed B. Their immune system is not yet fully developed C. They have thicker feathers D. They are kept in larger numbers Answer: B
- Which management practice would most directly reduce disease spread caused by poor hygiene? A. Reducing stocking density only B. Regular cleaning and disinfection of drinking troughs and pens C. Feeding a higher energy ration D. Selecting a hardier breed Answer: B
- An unvaccinated flock is at greater risk from a disease outbreak chiefly because: A. It has no trained immunity against that specific pathogen B. It eats more feed than a vaccinated flock C. It grows faster than a vaccinated flock D. Vaccination has no effect on immunity Answer: A
Yi Rijista don Ci Gaba
Ƙirƙiri asusu kyauta don samun damar duk kayan koyo, tambayoyin atisaye, da kuma bibiyar ci gaban ka.
Yi Rijista don Ci Gaba
Ƙirƙiri asusu kyauta don samun damar duk kayan koyo, tambayoyin atisaye, da kuma bibiyar ci gaban ka.
