J. Anim Sci., doi: 10.2527/jas.2006-340
©Copyright, 2007, The American Society of Animal Science
An E. coli phytase expressed in yeast effectively replaces inorganic phosphorus for finishing pigs and laying hens
N. R. Augspurger 1*,
D. M. Webel 1,
D. H. Baker 2
1 JBS United, Inc., Sheridan, IN 46069
2 Department of Animal Sciences, University of Illinois, Urbana, IL 61801
* To whom correspondence should be addressed. E-mail: nathan.augspurger{at}jbsunited.com.
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Abstract |
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Two trials were done to determine the efficacy of an E. coli phytase (ECP) added to P-deficient corn-soybean meal diets fed to finishing pigs and second-cycle laying hens. Sixty finishing pigs (49 ± 0.9 kg) were formed into blocks within gender based on weight and ancestry, and allotted to a P-deficient diet unsupplemented or supplemented with 0.10% inorganic P (iP) from KH2PO4, or ECP at 250, 500, 1,000 or 10,000 FTU/kg. Individually-fed pigs were allowed ad libitum access to the experimental diets until an end BW of 120 ± 3 kg was achieved, at which time pigs were euthanized and the left fibula and 4th metatarsal were excised for determination of bone ash. Pigs were fed a 2-phase diet program for early- and late-finishing pigs; available P in the basal diets was set 0.10% below the requirement. Dietary supplementation of iP or ECP increased weight gain (P < 0.10) and gain/feed (P < 0.01); performance was not different (P > 0.13) among the phytase-supplemented groups. Fibula ash was greatest (P < 0.01) for pigs fed diets containing 10,000 FTU/kg ECP. Two hundred forty second-cycle hens were allotted to a P-deficient diet, or a P-deficient diet supplemented with 0.10% iP or ECP at 150, 300, or 10,000 FTU/kg, for a 12-wk trial. The basal diet was a corn-soybean meal diet with no added iP (17% CP, 3.8% Ca, 0.10% available P). Hens fed the P-deficient diet were removed from the trial after 4 wk due to poor egg production. Supplementation of iP or ECP resulted in superior (P < 0.01) feed intake, egg weight, and egg production during the first 4 wk. During the entire 12-wk period there were no differences (P > 0.28) between the iP- and ECP-supplemented groups in feed intake, egg weight, or egg production. These trials reveal that ECP was as efficacious as supplemental iP, and that supplementation of an excess dose of ECP was efficacious and without negative effects in both finishing pigs and laying hens.
Key Words:
Hens, Phosphorus, Phytase, Pigs
