SFLORES3172014 28 That amount getting into the body is the same as beef round

Sflores3172014 28 that amount getting into the body

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SFLORES_3/17/2014 28 That amount getting into the body is the same as beef round, so if you do that with pecans at 12.5%, the BV is 60 which is consistent with what we know about the EAA content which is not as good as animal proteins 46. BVs PROVIDE PROTEIN RANKINGS - Actual BV numbers not important. Importance is how you rank the proteins; certain types of proteins are higher than others - Some BV numbers for humans BV BV Egg 94 Rice & Soy 73 Cow milk 85 Potato 67 Shellfish 81 Whole wheat 65 Casein 80 White rice 64 Fish 76 Beans 58 Chicken/beef 74 Peanut 55 - You have to do a lot of tedious collections and assays to get a measure of protein quality and BV dominated the field for many decades. 47. NPU - Another popular method invented: NPU (Net Protein Utilization). Gives similar results and rankings as BV but it + Eliminates the need to make daily urine and stool collections + There’s less protocols; a lot easier to do + Less chance of error + Can also be done in a variety of species - NPU directly measures how much N is in the whole body by doing whole carcass analysis o NPU = % retention of N/protein consumed (versus BV which is % retention of N absorbed) o NPU automatically takes into account efficiency of digestion and absorption; therefore better than BV (All you’re looking at is amount of N put directly in carcass) If only half of it is digested, then you’ll be penalizing the animal b/c it won’t grow as much, it won’t retain the N. If the protein in the diet is a good protein source but only half of it is digested then the body will only grow ½ as much. NPU = BV x digestibility; BV doesn't factor in loss due to digestibility - Equation for NPU: ??−(??−𝐼?) 𝐼? = o B f = carcass N (amount of total N in the whole body) o B k = carcass N in animal fed on protein free diet In B k animal, it’s BW and N levels will as experiment progresses b/c it’s not getting any protein o I f = N in the test protein diet; how much protein did the animal eat during that study o I k = N consumed on the protein-free diet (not much)
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SFLORES_3/17/2014 29 Animals on the protein-free diet have a little bit of trace N coming from CHO source (wheat starch, corn starch, V&M formulas, fat content). This isn’t much but to be precise you need to account for that; makes results more accurate - One of the refinements: Determining water:protein ration of body/carcass, which theoretically remains constant in an animal. o Eventually this was further refined to say that we don’t need to measure whole carcass we can just cut off the leg of animal and dry it out to constant weight to determine water:protein ratio. + You don’t have to measure N you just measure how much water in the body and from that equation it can be related back to total body protein 48. PER - PER (Protein Efficiency Ratio) - still used by the FDA for determining the quality of a protein suitable for infants o Used before the PDCAAS for all age groups o But PER still used on food labels which gives %protein in one serving of food and %DV For example, if it’s a high quality protein (i.e. casein, which has a high PER):
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  • Spring '14
  • Knutson,MitchellD
  • NRG

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