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cvanderloo

Feeding cows a few ounces of seaweed daily could sharply reduce their contribution to c... - 0 views

theconversation.com/ution-to-climate-change-157192

cows climatechange seaweed methane science technology

shared by cvanderloo on 27 Mar 21 - No Cached
  • About 70% of agricultural methane comes from enteric fermentation – chemical reactions in the stomachs of cows and other grazing animals as they break down plants. The animals burp out most of this methane and pass the rest as flatulence.
  • A 2015 study suggested that using seaweed as an additive to cattle’s normal feed could reduce methane production, but this research was done in a laboratory, not in live animals.
  • If these findings can be scaled up and commercialized, they could transform cattle production into a more economically and environmentally sustainable industry.
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  • This process also generates byproducts that the cow’s body does not take up, such as carbon dioxide and hydrogen. Methane-producing microbes, called methanogens, use these compounds to form methane, which the cow’s body expels.
  • In that work, we showed that supplementing dairy cows’ feed with about 10 ounces of seaweed a day reduced methane emissions by up to 67%. However, the cattle that ate this relatively large quantity of seaweed consumed less feed. This reduced their milk production – a clear drawback for dairy farmers.
  • We wanted to know whether the seaweed was stable when stored for up to three years; whether microbes that produce methane in cows’ stomachs could adapt to the seaweed, making it ineffective; and whether the type of diet that the cows ate changed the seaweed’s effectiveness in reducing methane emissions. And we used less seaweed than in our 2019 study.
  • As we expected, the steers released a lot more hydrogen – up to 750% more, mostly from their mouths – as their systems produced less methane. Hydrogen has minimal impact on the environment.
  • We also found that seaweed that had been stored in a freezer for three years maintained its effectiveness, and that microbes in the cows’ digestive systems did not adapt to the seaweed in ways that neutralized its effects.
  • For example, we calculate that a producer finishing 1,000 head of beef cattle – that is, feeding them a high-energy diet to grow and add muscle – could reduce feed costs by US$40,320 to $87,320 depending on how much seaweed the cattle consumed.
  • We don’t know for certain why feeding cattle seaweed supplements helped them convert more of their diet to weight gain. However, previous research has suggested that some rumen microorganisms can use hydrogen that is no longer going into methane production to generate energy-dense nutrients that the cow can then use for added growth.
  • Commercializing seaweed as a cattle feed additive would involve many steps. First, scientists would need to develop aquaculture techniques for producing seaweed on a large scale, either in the ocean or in tanks on land.
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