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10 Cards in this Set
- Front
- Back
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What is the purpose of intensive rearing of domestic livestock?
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To produce the maximum yield of meat, eggs and milk at the lowest possible cost.
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It is important to remember that intensively reared animals still require large amounts of plant material as a source of food...
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...and this needs to be grown somewhere
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How does intensive rearing increase the energy-conversion rate?
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Movement is restricted and so less energy is used in muscle contraction
The environment can be kept warm (think) Feeding can be controlled - no waste Predators excluded |
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How does selective breeding improve the energy-conversion rate?
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Varieties are produced that are more efficient at converting the food they eat into body mass
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How can growth rate be increased?
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Use of hormones
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What are the main features of intensive rearing?
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Efficient energy conversion, low cost, quality of food (lowered), use of space, safety, disease, use of drugs, animal welfare, pollution (lots of waste in small area), reduced genetic diversity, use of fossil fuels
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What human practices have reduced species diversity?
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removal of hedgerows and woodland, creation of monocultures, filling in ponds, over-grazing of land, eutrophication
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What are methods to increase species and habitat diversity without unduly raising food costs or lowering yields?
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Maintaining existing hedgerows at the most beneficial height and shape to provide better habitats, plating hedges rather than erecting fences, maintaining existing ponds, creating new ones, leave wet corners of fields, plant native tries in low species diversity areas, reduce pesticide usage (use biological), use organic fertilisers, use a crop rotation that includes a nitrogen-fixing crop, rather than fertilisers, use hay rather than grasses for silage (food)
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What has encouraged farmers to adopt some of these coservation methods?
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Financial incentives from defra and the EU
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Why might conservation be essential?
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Intensive rearing could permanently devoid an area of land for growth
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