By Michael R. Bedford, Gary G. Partridge
Overlaying all facets of the addition of enzymes to animal feeds, this publication discusses issues together with interactions with animal body structure, fiscal and environmental affects and know-how. This new version brings the reader modern with the massive advances in feed enzyme know-how of the decade. It incorporates a dialogue of latest sessions of enzymes brought into the marketplace position, an exploration of the way those items functionality and the scale and scope in their use within the worldwide with new tools for assessment of enzyme responses.
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Additional resources for Enzymes in Farm Animal Nutrition
2002, 2005). 6) to family 10. All P. 2. XynB and XynD xylanases contain a family 1 CBM, whereas XynC does not include a CBM. In addition to the above ‘true’ xylanases, a 48 kDa GH family 7 cellobiohydrolase from P. , 2005). However, the specific activities of XynB and XynD are clearly higher with respect to both soluble and insoluble wheat arabinoxylans compared with XynA. g. , 2005). All P. , 2002, 2005). , 2008). This analysis confirms the existence in the commercial product of the above three xylanases and the xylanase/cellobiohydrolase XynA.
2004). Although Trichoderma EGV/Cel45A shares homology with the three other well-characterized GH 45 cellulases (H. insolens, T. terrestris and M. , 2002). 6) has been found in T. reesei in expression screening in yeast (Saloheimo, 2004). Information on the development of thermostable feed β-glucanases is limited. , 2003a; the relevant gene accession numbers are AX812161 and AY055121, respectively). 0 and was most active on CMC at 70ºC. , 2003a). Cel5A purified from the original host retained 96% and 91% of barley-β-glucanase activity after pelleting at 75ºC and 85ºC, respectively.
1988; Cherry and Fidantsef, 2003; Maurer, 2004). Bacillus produces enzyme in the relatively short time of perhaps 48 h, whereas fungal hosts are typically cultivated for several days; thus the economics of both systems are comparable. There are several limitations in the use of the classical strains as the only method of enzyme manufacture – for example: (i) enzyme diversity is limited to the native enzymes of the host; (ii) expression levels of the desired activities can be limiting; (iii) the strain may secrete side-enzyme activities that are harmful in certain applications; or (iv) the production host may produce harmful secondary compounds such as acids or toxins.