Effect of microbial phytase and 1,25-dihydroxycholecalciferol on dietary copper utilization in chicks.
Bile Cu accumulation in Cu-depleted chicks fed Cu concentrations between .56 and 1.56 mg Cu/kg (0, .5, or 1 mg supplemental Cu/kg) was used to investigate the effect of microbial phytase at 600 U/kg and 1,25-dihydroxycholecalciferol [1,25-(OH)2D3] at 10 micrograms/kg on Cu bioavailability from dehulled soybean meal (SBM) and cottonseed meal (CSM). The bioavailability of Cu (relative to CuSO4.5H2O, which was set at 100%) in SBM and CSM was 43 and 39%, respectively. Phytase addition (600 U/kg diet) decreased Cu bioavailability in SBM to 21%, but did not affect that in CSM (34%). Copper bioavailability in SBM was not affected by addition of 1,25-(OH)2D3 (10 micrograms/kg diet), but that in CSM was nearly doubled by 1,25-(OH)2D3 supplementation.
Aoyagi
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Department of Animal Sciences, University of Illinois, Urbana 61801.
Baker
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DH
D010832:6-Phytase / Q000494:pharmacology*; D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism; D002117:Calcitriol / Q000494:pharmacology*; D002645:Chickens / Q000378:metabolism*; D003300:Copper / Q000378:metabolism*; D003368:Gossypium; D008297:Male; D009753:Nutritive Value; D012639:Seeds / Q000378:metabolism*; D013025:Glycine max / Q000378:metabolism
D003300:Copper; D010832:6-Phytase; D002117:Calcitriol