Pharmacological zinc levels reduce the phosphorus-releasing efficacy of phytase in young pigs and chickens

Journal of Animal Science
N R AugspurgerD H Baker

Abstract

A pig trial and a chick trial were done to determine the effect of high levels of Zn and Cu on the P-releasing efficacy of phytase. Ninety-nine individually fed pigs (7.2 kg) were given ad libitum access to one of 11 experimental diets for a period of 21 d. Fibula ash (mg) was regressed against supplemental inorganic P (iP) intake (g) to establish the standard curve, from which phytase treatments were compared to determine P-releasing efficacy. The basal diet was a corn-soybean meal diet with no supplemental P (21% CP, 0.075% estimated available P, 130 mg of Zn/kg, as-fed basis). Diets included three graded levels of supplemental iP (0, 0.075, 0.150%) from reagent-grade KH2PO4, two levels of phytase (500 and 1,000 FTU/kg) from EcoPhos, 1,500 mg of Zn/kg from either Waelz ZnO or basic Zn chloride (Zn5Cl2(OH)8), and all combinations of phytase and Zn. One phytase unit (FTU) was defined as the amount of enzyme required to release 1 micromol of iP per minute from sodium phytate at 37 degrees C and pH 5.5. Phytase supplementation improved (P < 0.01) weight gain, G:F, and fibula ash (% and mg). Bone ash (mg) was highest (P < 0.01) for pigs fed diets containing 1,000 FTU/kg of phytase. Supplemental Zn had no effect (P > 0.50) on growt...Continue Reading

References

Nov 1, 1975·Journal of Agricultural and Food Chemistry·A R de BolandB L O'Dell
Nov 1, 1991·Journal of Animal Science·M A Funk, D H Baker
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Apr 28, 2001·Journal of Animal Science·G M HillUNKNOWN NCR-42 Committee on Swine Nutrition
Jun 1, 1965·Proceedings of the Society for Experimental Biology and Medicine·C A BYRD, G MATRONE

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Citations

Nov 11, 2014·Journal of the Science of Food and Agriculture·Yueming Dersjant-LiGary Partridge
Jun 23, 2011·Journal of Animal Physiology and Animal Nutrition·V KumarK Becker

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