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APES. Get out Ch. 13 Notes. Meat!. Meat Production and Consumption Have Grown Steadily. Animals for meat raised in Pastures and rangelands Feedlots Meat production increased fourfold between 1961 and 2007 Increased demand for grain Demand is expected to go higher. - PowerPoint PPT PresentationTRANSCRIPT
Meat Production and Consumption Have Grown Steadily
• Animals for meat raised in– Pastures and rangelands– Feedlots
• Meat production increased fourfold between 1961 and 2007– Increased demand for grain–Demand is expected to go higher
How is meat produced?
Kilograms of grain needed per kilogram of body weight
Beef cattle 7
Pigs 4
Chicken 2.2Fish (catfish
or carp)2
•Feedlots–Account for 40%
of the world’s meat production
• Open grazing– 80% of cattle,
sheep and goats are raised on rangeland
Producing Meat
• Rangeland– Too dry– Too steeply sloped– Too infertile… to grow crops• 40% of ice-free land area
• Pastures–Managed grasslands or enclosed
meadows
How can we increase livestock yields?
hormone and antibiotic injections.
European Union (EU) banned use due to health concernsBUT US/Canada still use practice
Producing More Meat
• Condition of the world’s rangelands
• Environmental Consequences of meat produciton – See connections page 299 (13th
edition)– Read Spotlight page 300 (13th
edition) –DECLINING!
What is rBGH?
• Recombinant bovine growth hormone (rBGH)• synthetic (man-made) hormone • marketed to dairy farmers to increase milk
production in cows. • used in the United States since it was
approved by the Food and Drug Administration (FDA) in 1993, but its use is not permitted in the European Union, Canada, and some other countries.
Rangelands & Overgrazing
• What are rangelands? – Grassland ecosystems
used to support livestock
– Livestock eat shoots of plants (for food) & leave root system intact
– CAN lead to overgrazing
Overgrazing:
• Organisms exceed carrying capacity– Increase soil erosion– Increase soil compaction–Desertification conditions
Can lead to undergrazing
• Likely in more arid areas, reduces net productivity as it does not stimulate growth
Overgrazing can lead to land degradation & eventual desertification
Degradation- Loss of topsoil- Reduce Biodiversity- Loss Fertility- Loss nutrients
* Can be remediated to previous conditions
Desertification- Loss of topsoil- Reduce Biodiversity- Change Ecosystem- Leads to desert like
conditions