(5.6) Intensive Rearing DLS

Question 1

Increase energy conversion rate;

Factory farming; animals kept in confined spaces

Answer 1

• Restricted MM; less energy muscle contraction
• Less energy for temp maintenance; less heat loss from body - warm env
• controlled feeding; animals receive opt amount & type of food; max growth & no waste
• Exclusion of predators; no loss to other org in food web

;; SELECTIVE BREEDING = animals which are more efficient in converting food they eat to body mass

Hormones to increase growth rates

Question 2

Features of IR DLS

Answer 2

Efficient energy conversion; more energy passed to humans

• Low cost
• Lower Q of food?
• Less land/countryside used ; more natural habitats
• safety; easier to control (cages), less external diseases however; rapid spread of disease within
• Use of drugs; led to ABR, affect taste of food and human health
• Animal welfare; poor WB; debeaked (aggression), stress, joint pain, osteoporosis
• Pollution; produce large conc waste in small area; rivers become polluted.
• Red GD: selective breeding for certain Qualities. Lose genes which may be beneficial in future
• Fossil fuels; in heating buildings, transport of animal feeds. C02 increases global warming

Question 3

Aim of IR Of DLS

Answer 3

Max yield of meat, eggs & milk @ lowest cost
Minimise energy losses
Increase energy conversion rate

Cows pigs chickens!