Document Detail

Growth performance, diet nutrient digestibility, and bone mineralization in weaned pigs fed pelleted diets containing thermostable phytase.
MedLine Citation:
PMID:  23148255     Owner:  NLM     Status:  Publisher    
Traditional supplemental dietary phytase loses activity during steam pelleting. The thermal tolerance and bio-efficacy of a phytase product with a thermo-protective coating (C-phytase) was compared in mash and pelleted diets to a traditional, uncoated phytase (U-phytase) added to a negative control (NC) diet, formulated with reduced dietary Ca and P, and compared to a corn-soybean meal based positive control (POC) diet. Growth performance, nutrient digestibility, and third metacarpal bone characteristics were response variables. Weaned pigs (n = 56; initial BW, 8.20 ± 0.5 kg; 28-d of age) were individually housed and randomly allotted to 1 of 7 diets for 21-d. The diets were: 1, POC mash; 2, NC mash; 3, NC pelleted at 90°C; 4, NC mash + 500 U/kg U-phytase; 5, NC mash + 500 U/kg C-phytase; 6, NC + 500 U/kg C-phytase pelleted at 80°C; and 7, NC + 500 U/kg C-phytase pelleted at 90°C. The POC and NC diets were formulated to be isoenergetic and isolysinic. The content of Ca and available P was 1.01 and 0.40% and 0.83 and 0.22% in the POC and NC diets, respectively. Pig BW and feed intake were measured on d 7, 14, and 21, and feces were collected for 2 d. On d 21, pigs were killed and ileal digesta and the third metacarpal bone collected. Pigs fed POC had higher (P < 0.05) ADG, G:F, P digestibility, and bone mineralization but lower (P < 0.01) energy digestibility than pigs fed NC. Pelleting the NC diet did not improve performance, nutrient digestibility, or P utilization. Adding the U-phytase to NC mash diet increased (P < 0.05) ADG, G:F, apparent ileal digestibility (AID) of CP and Ile, Leu, Phe, Thr, Val, and Ser and apparent total tract digestibility (ATTD) of P compared to pigs fed NC. Pigs fed C-phytase in NC mash diets had increased (P < 0.05) G:F and an AID of CP and AA and ATTD of P compared with pigs fed NC, but not different than pigs fed U-phytase NC mash diets. Pigs fed pelleted NC diet with C-phytase had a higher (P < 0.05) ATTD of P and energy than pigs fed mash NC diet with C-phytase but had similar growth performance, AID of CP and AA, and bone mineralization to pigs fed U-phytase. In conclusion, release and bio-efficacy of phytase after pelleting was not affected by the thermal protective coating.
J L Yáñez; J L Landero; A Owusu-Asiedu; M Cervantes; R T Zijlstra
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada.
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