Economic Importance Of Parasites
Resumen
A goat that is never once diagnosed with a disease can still quietly cost its owner more than a sick one. A worm burden that never kills anything slows growth, thins milk yield, and scars a hide that would otherwise fetch a premium price, week after week, without a single dramatic symptom to give it away. Parasites are the patient thief of animal production, and the only way to see how much they steal is to put a naira figure on the theft.
In this lesson you will learn to price out what a parasite burden actually costs: the weight gain it takes off an animal, the milk or eggs it removes from output, the dewormers and acaricides a farmer must keep buying to hold it back, and the hide or carcass value it strips away at sale. You will then scale that farm-level arithmetic up to see why parasites are treated as a threat to Nigeria's food security and export earnings, not just to one herd.
Objetivos
- Explain the economic importance of parasites to animal production
- State the losses caused by parasites to farm animals
- Explain the effect of parasites on the quality of animal products
- Explain the effect of parasites on national food security
- Suggest ways of minimising the economic impact of parasites
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- A dewormed group of animals converts feed to weight gain more efficiently than a worm-infested group on the same ration. This is best described as a loss in: A. Product downgrading B. Feed conversion efficiency C. Carcass condemnation D. Fertility Answer: B
- A hide scarred by tick and mange damage grades lower and sells for less than an undamaged hide of the same size. This economic effect of parasites is best described as: A. Reduced weight gain B. Product downgrading C. Reduced milk yield D. Treatment cost Answer: B
- A flock of 25 sheep gains 3.0 kg per week when healthy but only 1.8 kg per week under a heavy worm burden. If live weight sells at 1,500 naira per kg, what is the naira value of ONE week's weight-gain loss for the whole flock? A. 18,000 naira B. 30,000 naira C. 45,000 naira D. 75,000 naira Answer: C
- Which of the following is a recurring economic cost of parasite control, rather than a loss caused directly by the parasite itself? A. Reduced egg output B. Carcass condemnation C. Money spent on dewormers and acaricides D. Hide downgrading Answer: C
- In Nigeria, a blood parasite spread by the tsetse fly has made large areas of grazing land in the Middle Belt unsuitable for many cattle breeds. This parasite disease is: A. Coccidiosis B. Trypanosomiasis C. Fascioliasis D. Newcastle disease Answer: B
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Crea una cuenta gratuita para acceder a todos los recursos de aprendizaje, preguntas de práctica y seguir tu progreso.
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Crea una cuenta gratuita para acceder a todos los recursos de aprendizaje, preguntas de práctica y seguir tu progreso.
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Preguntas de repaso
¿Te preguntas cómo son las preguntas anteriores sobre este tema? Aquí tienes una serie de preguntas sobre Economic Importance Of Parasites de años anteriores.
Pregunta 1 Informe
(a) Stat three ways in which specimen A (Tapeworm) is of economic importance.
(b) State four ways of controlling specimen A
(c) List three nutrients contained in specimen B (Fish meal)
(d) Name two ectoparasites that could infest the farm animal from which specimen C (Hide of cattle) was obtained.
(e) Mention three uses of specimen C
Detalles de la respuesta
(a) Three ways in which specimen A (Tapeworm) is of economic importance
- It causes loss of weight and reduced productivity in infested animals.
- It leads to condemnation of infected meat and organs at inspection, causing financial loss.
- It can be transmitted to man (as cysticercosis/measly meat), and heavy infestation may kill the animal.
(b) Four ways of controlling specimen A (Tapeworm)
- Deworm the animals regularly with a suitable drug.
- Ensure thorough meat inspection to detect and condemn infected meat.
- Cook meat properly before eating to kill the cysts.
- Maintain good sanitation with proper disposal of faeces, and control the intermediate host.
(c) Three nutrients contained in specimen B (Fish meal)
- Protein.
- Calcium.
- Phosphorus (also fat/oil and vitamins).
(d) Two ectoparasites that could infest cattle (from which specimen C, hide, was obtained)
- Tick.
- Louse (also mite, tsetse fly).
(e) Three uses of specimen C (Hide of cattle)
- Making leather for shoes, bags and belts.
- Making drum coverings and other crafts.
- Source of income (and raw material for glue/gelatin).