Well howdy!
 Please
take your GMO articles and your
free response to the lab table.
 Staple everything and leave in the white
bin.
 (If your articles aren’t printed, email the
links NOW to cklein@houstonisd.org)
 Thanks!
Raising
meat to eat
Our food chain
human
human
animals
plants
plants
Meat based- diets
 Advantages
 Disadvantages
CAFOs
(FM19:30)
 Concentrated
Animal Feeding
Operations
Chicken CAFOs
Pig CAFOs
Cow CAFOs
CAFOs are not sustainable

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Disease spread by manure from animal to
animal
Feeding cows corn mutates e. coli to more
virulent strain, requiring more antibiotics.
Need for more antibiotics increases bacterial
resistance
Food-borne illness outbreaks hard to
trace/prevent
Large amounts of manure pollute rivers
Increased habitat loss
Smell bad, look bad
Additives at CAFOs
 Antibiotics:
Monesin (Kills inefficient gut
bacteria) and Tylosin (prevents liver
abcesses)
 Hormones: Estradiol (form of estrogen)
and Zilpaterol (increase growth rate)
How is Polyface farm sustainable? How
does Salatin use ecology to improve
production?
 Carbon/nitrogen/
water cycles
 Succession
 Food webs
 SCALEABILITY!
Sustainability considerations

Whole foods
Local food
Seasonal food

Polyculture/polyvarietal
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IPM pest strategies
Organic fertilizers
People/animal
power
Long term soil fertility
Fair trade = fair
wages for fair work
Chicken and turkey chicks
Sustainable meat – look for
these terms
 Grass
fed
 Pastured
 Local
 Organic
 More omega 3
 leaner
Farmer’s markets offer
 Beef
 Chicken
& eggs
 Lamb
 Pork
& Bacon
 Fish
 Rabbit
 Goat
and goat
cheese
Hens for Houston
Carole Morison – switched!
 Purdue
canceled
her contract after
Food Inc.
 She decided to go
free range and is
happier and
healthier now 
 Go Carole!
What about fish?
 3rd
major source of
food for humans
 1 billion people rely
on fish for main
source of protein
 Some ocean wild
fish populations are
overfished
 Fisheries
collapse?
As of 2006, 30% of
fisheries worldwide
have declined by
90%
Fish Farming (ff: 9min)
 Global
fish
production has
increased by more
than 20% since
1980, mostly due to
aquaculture
 Raising fish/shellfish,
seaweeds in tanks
= aquaculture
Oceanic Fish Farms
 Stock,
feed,
clean
 Density may
require antibiotics
 Clean water
pumped in one
end and used
water out the
other
Tradeoffs!
 Can
be local
 Scalable
 Can be combined
with plants for a
nutrient cycle
 Protein source
Dense populations
can spread
disease , waste
products (density
dependent!)
Consideration of
what they are
being fed
Escaping fish may
spread disease
Check for understanding
 What
does CAFO stand for?
 Why are cows fed corn in CAFOs?
 What is a consequence of feeding cows
corn?
 Name two ways CAFOs are not
sustainable.
 What can you look for on food labels to
find more sustainable options?
 Do people HAVE to eat meat?
 Why does eating meat require more total
energy than eating vegetarian?