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Related Concept Videos

Production Efficiency01:01

Production Efficiency

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
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Trophic Efficiency00:46

Trophic Efficiency

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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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The Nitrogen Cycle01:49

The Nitrogen Cycle

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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Energy Budgets00:51

Energy Budgets

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Zeroth Law of Thermodynamics01:14

Zeroth Law of Thermodynamics

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Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
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Does 'net zero' mean zero cows?

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    Livestock, especially cattle and sheep, contribute to global warming through methane emissions. Climate stabilization does not require eliminating herds, but limiting livestock emissions is crucial for climate action.

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    Area of Science:

    • Environmental Science
    • Climate Change Research
    • Agricultural Science

    Background:

    • Anthropogenic global warming is significantly influenced by livestock production.
    • Debate exists regarding livestock's role in a sustainable future, particularly for ruminants like cattle and sheep due to methane emissions.

    Purpose of the Study:

    • To analyze the impact of livestock emissions, specifically methane, on global warming.
    • To evaluate the necessity of eliminating cattle herds for climate stabilization.
    • To determine the role of livestock in climate change mitigation strategies.

    Main Methods:

    • Analysis of the differential climate effects of short-lived gases (methane) versus long-lived gases (carbon dioxide).
    • Assessment of the contribution of livestock to overall greenhouse gas emissions.
    • Evaluation of emission reduction strategies within the context of climate stabilization.

    Main Results:

    • Methane, a short-lived greenhouse gas, affects climate differently than long-lived gases like carbon dioxide.
    • Climate stabilization does not necessitate the complete eradication of cattle herds.
    • Livestock production remains a contributor to global warming, despite the distinct nature of methane emissions.

    Conclusions:

    • Preventing or limiting the growth of livestock-related emissions is a viable climate change mitigation strategy.
    • Livestock emission management is particularly important when carbon dioxide emission reduction targets are not being met.
    • A balanced approach considering different greenhouse gases is essential for effective climate action.