Comparative Housing

Question 1

what are the differences between climatic vs. controlled environment

Answer 1

climatic: low stocking density, large cubic air space per animal, not insulated, naturally ventilated, natural daylight, cheaper

controlled: high stocking density, fairly low cubic air space per animal, well insulated, carefully controlled ventilation, expensive to construct, artificially lit

Question 2

what is the difference between active vs. passive ventilation

Answer 2

active: fans (+/- ducting)
passive: stack effect, cross wind, inlets

Question 3

what is the stack or pressure effect

Answer 3

lighter warm air rises out of the top of building sucking in cold air from lower down

stack effect is driven by heat generated within the building (by livestock)

Question 4

what is natural ventilation

Answer 4

wind sets up differences in air pressure around building

Question 5

what is an inlet

Answer 5

continuous gap between inner wall and outer cladding

air enters via gap between inner wall and outer cladding

Question 6

what is a well ventilated building (how many air changes)

Answer 6

10-15

Question 7

what does good housing provide

Answer 7

1. suitable temp
2. adequate fecal/urinary separation
3. adequate O2
4. no buildup of noxious gases/pathogens
5. appriopraite feeding
6. safe and secure environment