On Tue, 9 Jun 2009 11:34:57 +0200, "Per A. Hansen"
<xperhansen@energimail.dk> wrote:
>Angående det økologiske del, så ligger der en del forskning på området.
>Uden pesticider vil produktionen på global plan falde ca. 40%.
Det kan man jo så tage højde for ved at spise afgrøderne direkte i
stedet for at bruge størsteparten til kødproduktion, der reducerer den
reelle fødeværdi med op til flere hundrede procent.
Når man kigger på nedenstående tal skal man iøvrigt huske at
kalorieværdien af korn ofte er 2-3 gange større pr kg. end
kalorieværdien af kød.
Animals raised for food in the U.S. consume 90% of the soy crop, 80%
of the corn crop, and 70% of its grain.
http://en.wikipedia.org/wiki/Environmental_effects_of_meat_production
Cattle, for example, require 7 kg of grain
to produce 1 kg of beef, whereas pigs require 4 kg of grain
to produce 1 kg of pork, and poultry require only 2 kg of
grain to produce 1 kg of poultry. In addition, the
amount of water required to produce protein by IAP
includes both that which is consumed directly by the
animals and the approximately 1000 tons of water needed
to grow 1 ton of grain for feed.
http://journals.cambridge.org/download.php?file=%2FPHN%2FPHN8_04%2FS1368980005000492a.pdf&code=ec13885a2b576cfcbb451e4f5abcf862
....the data we had indicated that a beef animal consumed 100 kg of hay
and 4 kg of grain per 1 kg of beef produced. Using the basic rule that
it takes about 1,000 liters of water to produce 1 kg of hay and grain,
thus about 100,000 liters were required to produce the 1 kg of beef.
http://en.wikipedia.org/wiki/Environmental_effects_of_meat_production
The 4.8 pounds of grain fed to cattle to produce one pound of beef for
human beings represents a colossal waste of resources in a world still
teeming with people who suffer from profound hunger and malnutrition.
http://www.emagazine.com/view/?142
Farm animals are extremely inefficient converters of plants to edible
flesh. To produce 31.2 million t of carcass meat in 1993, US farm
animals were fed 192.7 million t of feed concentrates, mostly corn.
Additional feed took the form of roughage and pasture (FAO 1997; USDA
1997). Broiler chickens are the most efficient, requiring only 3.4 kg
of feed (expressed in equivalent feeding value of corn) to produce 1
kg of ready-to-cook chicken. Pigs are the least efficient. For pig
meat, the feed-produce ratio is 8.4 : 1; for eggs, by weight, 3.8 : 1;
and for cheese, 7.9 : 1 (USDA 1997).
http://www.idrc.ca/en/ev-30610-201-1-DO_TOPIC.html
....about two to five times more grain is required to produce the same
amount of calories through livestock as through direct grain
consumption, according to Rosamond Naylor, an associate professor of
economics at Stanford University. It is as much as 10 times more in
the case of grain-fed beef in the United States.
http://www.nytimes.com/2008/01/27/weekinreview/27bittman.html
--
Rado
All the answers are already within us. It's finding the corresponding
questions that's so darned difficult. - Swami Beyondananda