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Analyze the provided energy-flow diagram. Calculate energy in A, energy lost in B, name energy in C, and state two aims of calculating feed energy value.

Biology

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2.5.1
The energy in C is the net energy (energy available for production and maintenance after heat production).

Net energy

2.5.2
The function represented by D is production.

Production

2.5.3

a) Energy in A

  1. Gross energy = 1000 kJ1000~\mathrm{kJ}

    Feces energy lost = 150 kJ150~\mathrm{kJ}

  2. Substitute into formula for energy after feces loss

    1000 kJ−150 kJ=850 kJ1000~\mathrm{kJ} - 150~\mathrm{kJ} = 850~\mathrm{kJ}

    Energy in A = 850 kJ850~\mathrm{kJ}

    850 kJ\boxed{850~\mathrm{kJ}}

    b) Energy lost in B

  3. Metabolic energy = 800 kJ800~\mathrm{kJ}

    Energy to C = 500 kJ500~\mathrm{kJ}

  4. Substitute into formula for heat production

    800 kJ−500 kJ=300 kJ800~\mathrm{kJ} - 500~\mathrm{kJ} = 300~\mathrm{kJ}

    Energy lost in B = 300 kJ300~\mathrm{kJ}

    300 kJ\boxed{300~\mathrm{kJ}}

    2.5.4
    Two aims of calculating the energy value of a feed:

    1. To evaluate and compare the nutritive value of different feeds.
    2. To formulate balanced and economical rations for animals.
    (1)Evaluate/comparenutritivevalueoffeeds(2)Formulatebalancedrationsforanimals\boxed{(1) Evaluate/compare nutritive value of feeds (2) Formulate balanced rations for animals}
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