Calculate the Apparent Nitrogen (protein) digestibility and the Apparent BIOLOGICAL VALUE from: N Intake 160g N in Feces 20g N in Urine 10g % App. N Digestibility _________ % App. B. V. _____________ What else would you need to know to calculate TRUE N. digestibility and TRUE Biological Value? _______________________________________ The following data came from a metabolism trial. From the following data, calculate the DE, ME and Net energy values. (10 pts) Feed consumed 5Kg @ 3000 Kcal/Kg Feed contained 15000Kcal Feces excreted 1Kg Feces contained 3000Kcal/Kg Urine & gas had 1000Kcal total. Heat increment 2500Kcal total DE%____________ DE, Kcal/Kg feed___________ ME%____________ ME, Kcal/Kg feed___________ Net E, Kcal/Kg feed __________ –On what basis would you evaluate the protein in a feed for cattle? for hogs? Why the difference? -What is canola? What are it’s advantages/disadvantages, compared to what? -What does the biological value indicate? Why would one feed have a high BV while another would have a low BV? -What is the effect on feeding value of test weight of corn? -What is opaque 2 corn and is its usefulness? -Describe what you know about nutritional energetics by discussing the difference between TDN, Digestible energy, metabolizable energy and net energy.
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