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From: Dave on 7 Feb 2006 21:51
The figures I'm using here are basically the first ones I came across.
If
anyone wants to offer more reliable figures feel free but the nature of
these
types of calculations means that I shall be making major approximations
in any case so no point in splitting hairs over the data.

"A beef steer gives us 459 pounds of beef to eat"
http://www.agr.state.nc.us/agscool/commodities/beefkid.htm
Note that the steers being discussed are fattened on
grain for the last three to four months of his life. I don't know
whether cattle fattened on grass alone can be expected to
reach similar weights.

One acre of corn can produce about 211 pounds of usable protein
http://www.ciwf.org.uk/publications/reports/Global_benefits_summary.pdf

Nutrition data for beef
http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=141
Data is for tenderloin. Obviously the whole carcass is not homogonous.

Nutrition data for corn
http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=65

Conversion from lbs to grams
http://www.metric-conversions.org/weight/pounds-to-kilograms.htm

459 lbs beef = 208 kg provides 208,000 * 240.41/113.4 = 440964 calories

one acre of corn provides 211 lbs = 95.7 kg protein.
For every g of protein corn provides 177.12/5.44 = 32.56 calories
*95,700 = 3 115 879 calories

calories per acre of corn / calories per steer = ~7.

No. of cattle killed in above equation = 1.
Decline in woodmouse population per hectare of cereal production
according to study by Mcdonald and Tew = 20
Decline per acre = ~8.
% decline due to mortality unknown.
Analysis only looks at one species and one part of the process.
Slaughter in the case of beef, harvesting in the case of corn.

From: rick on 8 Feb 2006 19:11

"Dave" <prplbn(a)hotmail.com> wrote in message
news:1139367105.699229.167420(a)o13g2000cwo.googlegroups.com...
> The figures I'm using here are basically the first ones I came
> across.
> If
> anyone wants to offer more reliable figures feel free but the
> nature of
> these
> types of calculations means that I shall be making major
> approximations
> in any case so no point in splitting hairs over the data.
>
> "A beef steer gives us 459 pounds of beef to eat"
> http://www.agr.state.nc.us/agscool/commodities/beefkid.htm
> Note that the steers being discussed are fattened on
> grain for the last three to four months of his life. I don't
> know
> whether cattle fattened on grass alone can be expected to
> reach similar weights.
===============================
Why not? I've bought halves almost that size.

Here's a note from that icon of radical right-wing agenda, Mother
Earth News. ;-)
"...Your extra year of pasturing can be expected to produce-on
the average -at least 200 pounds more beef than would be found on
an equivalent feed-lot raised steer . . . and maybe as much as
600 pounds more!..."
http://www.motherearthnews.com/menarch/archive/issues/063/063-110-01.htm

>
> One acre of corn can produce about 211 pounds of usable protein
> http://www.ciwf.org.uk/publications/reports/Global_benefits_summary.pdf
>
> Nutrition data for beef
> http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=141
> Data is for tenderloin. Obviously the whole carcass is not
> homogonous.
>
> Nutrition data for corn
> http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=65
>
> Conversion from lbs to grams
> http://www.metric-conversions.org/weight/pounds-to-kilograms.htm
>
> 459 lbs beef = 208 kg provides 208,000 * 240.41/113.4 = 440964
> calories
>
> one acre of corn provides 211 lbs = 95.7 kg protein.
> For every g of protein corn provides 177.12/5.44 = 32.56
> calories
> *95,700 = 3 115 879 calories
>
> calories per acre of corn / calories per steer = ~7.
>
> No. of cattle killed in above equation = 1.
> Decline in woodmouse population per hectare of cereal
> production
> according to study by Mcdonald and Tew = 20
> Decline per acre = ~8.
> % decline due to mortality unknown.
> Analysis only looks at one species and one part of the process.
> Slaughter in the case of beef, harvesting in the case of corn.







>


From: Dave on 9 Feb 2006 18:31

rick wrote:
> "Dave" <prplbn(a)hotmail.com> wrote in message
> news:1139367105.699229.167420(a)o13g2000cwo.googlegroups.com...
> > The figures I'm using here are basically the first ones I came
> > across.
> > If
> > anyone wants to offer more reliable figures feel free but the
> > nature of
> > these
> > types of calculations means that I shall be making major
> > approximations
> > in any case so no point in splitting hairs over the data.
> >
> > "A beef steer gives us 459 pounds of beef to eat"
> > http://www.agr.state.nc.us/agscool/commodities/beefkid.htm
> > Note that the steers being discussed are fattened on
> > grain for the last three to four months of his life. I don't
> > know
> > whether cattle fattened on grass alone can be expected to
> > reach similar weights.
> ===============================
> Why not? I've bought halves almost that size.
>
> Here's a note from that icon of radical right-wing agenda, Mother
> Earth News. ;-)
> "...Your extra year of pasturing can be expected to produce-on
> the average -at least 200 pounds more beef than would be found on
> an equivalent feed-lot raised steer . . . and maybe as much as
> 600 pounds more!..."
> http://www.motherearthnews.com/menarch/archive/issues/063/063-110-01.htm

Well I must admit I'm suprised by what I have just learnt. Presumably
this
is because grass fed steers are older?

From: rupertmccallum on 9 Feb 2006 20:15

Dave wrote:
> The figures I'm using here are basically the first ones I came across.
> If
> anyone wants to offer more reliable figures feel free but the nature of
> these
> types of calculations means that I shall be making major approximations
> in any case so no point in splitting hairs over the data.
>
> "A beef steer gives us 459 pounds of beef to eat"
> http://www.agr.state.nc.us/agscool/commodities/beefkid.htm
> Note that the steers being discussed are fattened on
> grain for the last three to four months of his life. I don't know
> whether cattle fattened on grass alone can be expected to
> reach similar weights.
>
> One acre of corn can produce about 211 pounds of usable protein
> http://www.ciwf.org.uk/publications/reports/Global_benefits_summary.pdf
>
> Nutrition data for beef
> http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=141
> Data is for tenderloin. Obviously the whole carcass is not homogonous.
>
> Nutrition data for corn
> http://www.whfoods.com/genpage.php?tname=nutrientprofile&dbid=65
>
> Conversion from lbs to grams
> http://www.metric-conversions.org/weight/pounds-to-kilograms.htm
>
> 459 lbs beef = 208 kg provides 208,000 * 240.41/113.4 = 440964 calories
>
> one acre of corn provides 211 lbs = 95.7 kg protein.
> For every g of protein corn provides 177.12/5.44 = 32.56 calories
> *95,700 = 3 115 879 calories
>
> calories per acre of corn / calories per steer = ~7.
>
> No. of cattle killed in above equation = 1.
> Decline in woodmouse population per hectare of cereal production
> according to study by Mcdonald and Tew = 20
> Decline per acre = ~8.
> % decline due to mortality unknown.
> Analysis only looks at one species and one part of the process.
> Slaughter in the case of beef, harvesting in the case of corn.

This assumes that pasture-ruminant production involves no collateral
deaths. Davis didn't find this assumption realistic.

From: rick on 9 Feb 2006 20:19

"Dave" <prplbn(a)hotmail.com> wrote in message
news:1139527870.702896.42810(a)f14g2000cwb.googlegroups.com...
>
> rick wrote:
>> "Dave" <prplbn(a)hotmail.com> wrote in message
>> news:1139367105.699229.167420(a)o13g2000cwo.googlegroups.com...
>> > The figures I'm using here are basically the first ones I
>> > came
>> > across.
>> > If
>> > anyone wants to offer more reliable figures feel free but
>> > the
>> > nature of
>> > these
>> > types of calculations means that I shall be making major
>> > approximations
>> > in any case so no point in splitting hairs over the data.
>> >
>> > "A beef steer gives us 459 pounds of beef to eat"
>> > http://www.agr.state.nc.us/agscool/commodities/beefkid.htm
>> > Note that the steers being discussed are fattened on
>> > grain for the last three to four months of his life. I don't
>> > know
>> > whether cattle fattened on grass alone can be expected to
>> > reach similar weights.
>> ===============================
>> Why not? I've bought halves almost that size.
>>
>> Here's a note from that icon of radical right-wing agenda,
>> Mother
>> Earth News. ;-)
>> "...Your extra year of pasturing can be expected to produce-on
>> the average -at least 200 pounds more beef than would be found
>> on
>> an equivalent feed-lot raised steer . . . and maybe as much as
>> 600 pounds more!..."
>> http://www.motherearthnews.com/menarch/archive/issues/063/063-110-01.htm
>
> Well I must admit I'm suprised by what I have just learnt.
> Presumably
> this
> is because grass fed steers are older?
======================
Most are given an extra years growth. Some, like the one I
mentioned somehow 'hid' during the picking process one year and
went into the next, and was 2 years older than normal. Quite
fat, quite tasty.




>


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