PowerPoint-Aaron Cowieson - The Poultry Federation

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Where does the genetic improvement come from?› Largely from increased feed intake and decrease maintenancerequirements (Huang, 2012; de Beer, 2012 – personal comm.)› HOWEVER, McDevitt et al. (2006) found that selection from 1970 to 2000has increased (P
So what?› Genetics have altered the birds efficiency, partly by altering nutrientdigestibility.› Simultaneously cereal and grain legume varieties are nutritionallyenhanced› Husbandry, nutrition and biosecurity is improved since 1970s› <strong>The</strong> closer bird performance is to the genetic potential the less opportunitythere is for enzyme to elicit a beneficial effect.› Nutrient digestibility cannot exceed 100%.› A CONCEPTUAL FRAMEWORK TO UNDERSTAND THE LIMITS11
Page 1: Enzymes beyond phytase in poultrynu
Page 5 and 6: What if all feed enzymes were FREE?
Page 7 and 8: De Beer (2010)
Page 9: FCR in the Future1.61.51.4FCR1.31.2
Page 13 and 14: Microingredient competitionAn addit
Page 15 and 16: % improvement in IAAD with xylanase
Page 17 and 18: Beyond phytase.......What is left t
Page 19 and 20: Low hanging fruitP first› Little
Page 21 and 22: Total Ca (% as fed)Phytase moves us
Page 27 and 28: Medium hanging fruit› If the low
Page 29 and 30: d49 BW (g/bird)FCR d49 (g:g)Cowieso
Page 31 and 32: Cowieson & Masey-O’Neill (2012) U
Page 33 and 34: Cooney et al., (1969) Biotech & Bio
Page 35 and 36: Future› Genetic improvements like

PowerPoint-Aaron Cowieson - The Poultry Federation

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