PowerPoint-Aaron Cowieson - The Poultry Federation

More documents

Recommendations

Info

A note on phytate› Differential scanning calorimetry and vapour pressure osmometry used toexplore the interaction between protein and phytate› Phytate DOES bind directly to protein provided that the pH is below the pIof the protein› Thus, in the gastric phase of digestion phytate crosslinks protein, droppingout of solution› In the small intestine phytate acts indirectly as a Hoffmeister anion› Importantly, ANIONS displace phytate from the protein surface thus thoughmuch has been made of the putative interacting effects of phytate and Nait may be Cl and other anions that are responsibleBye, J.W., Cowieson, N.P., Scwarz, R.R., Cowieson, A.J., Selle, P.H. & Falconer, R.J. (2012) The dual effects ofsodium phytate on the structural stability and solubility of proteins. Journal of Biological Chemistry, Under Review.26
Medium hanging fruit› If the low hanging fruit is higher phytase doses and/or combinations ofdifferent phytase at conventional doses what is next?› Xylanase OR glucanase (Cowieson et al., 2010)- Enhanced protein digestibility (gives some energy release)- Variable improvements in fat and starch digestibility- Marginal P and Ca digestibility improvements› New mechanisms for xylanase emerging (Masey-O’Neill et al., 2012;Cowieson & Masey-O’Neill, 2012) that explain the ‘generic effects’(Cowieson & Bedford, 2009) on all nutrients27
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 and 10: FCR in the Future1.61.51.4FCR1.31.2
Page 11 and 12: So what?› Genetics have altered t
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 23 and 24: Total Ca (% as fed)Phytase moves us
Page 25: Total Ca (% as fed)Phytase moves us
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

Create successful ePaper yourself

Delete template?

Save as template?