Math! How much CH4 is released by Sheep around the World?

Cow is not the only ruminant livestock which produce CH4 gas, though it is a major one. Other livestock is generating CH4 as well, and I shall check up each one of them (if I could find the neccessary information :P). How much of CH4 is emitted throughout these livestocks each year?

For time being, let’s look at sheep. After some googling, 2 claims for sheep (so far) are found.

Claim#1: Individual sheep emission rates were highly variable and averaged 19.5 ± 4.8 (SD) g CH4 per sheep per day. (source here)

Thus, a sheep can produce 7.12 kg of CH4 per year.

And, claim#2: New Zealand`s 70 million sheep create 350 million methane gallons daily. (source here)

70 million sheeps for 350 million gallons methane, 5 gallons CH4 per sheep per day, or equivalent to 18.93 L of CH4.

Divide by standard volume molar (22.414 L/mol), the weight of CH4 produced by sheep per day = 0.844 mol x 16 g (CH4 molecular weight) = 13.51 g per day.

In a year, a sheep is producing 4.93 kg CH4. And this value is lower than the claim#1.

As of year 2003, there is around 1 billion, or 1 024 070 182 sheeps (not including the sheep for milk) around the world. Thus, the total annual CH4 emission by sheeps for:

Claim#1: Total CH4 = 1 024 070 182 x 7.12 kg = 7.291 million tonnes.

Claim#2: Total CH4 = 1 024 070 182 x 4.93 kg = 5.049 million tonnes.

Apparently sheep is not emitting much CH4, compared to cow/cattle.

source: FAO, Global Livestock Production and Health Atlas

1 Comment

  1. cody said,

    June 13, 2015 at 6:03 pm

    in Texas i think some sheep are old some not so old there are over
    1 billion sheep in the word! i know about sheep is that sheep eat hay
    grass water and that baby sheep are called lambs! so sheep are so cute! i love sheep so so much! they are my favorite animal! sheep! i
    can not believe how many sheep are in the word! sheep!!! did i learn
    about sheep? i don’t know! how many miles can a sheep eat? i don’t
    know! to old sheep? get some sheep people but sheep are nice!
    nice sheep are awsome! baby sheep are so so cute! cute sheep!
    many sheep at the word are so so nice so in australia i think that
    sheep are careingful! so nice so sheep are nice sheep! i love baby cows
    too! cows and sheep are careingful so sheep are so so nice!
    sheep many sheep are in the word! if sheep are meain so run away!
    allways feed a sheep and care a sheep and good a sheep
    you are my favorite animal sheep! dogs!!! for sheep and dogs!!!!
    funny sheep! but sheep! nice sheep!

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