title: Efficacy of supplemental 1 alpha-hydroxycholecalciferol and microbial phytase for young pigs fed phosphorus- or amino acid-deficient corn-soybean meal diets.
abstract: Young pigs (5 wk of age and 8 kg) were used to test the efficacy of 1 alpha-hydroxycholecalciferol (1 alpha-OH D3) and microbial phytase for improving the utilization of phytate phosphorus (P) and amino acids present in corn-soybean meal (SBM) diets. Phytase supplementation (1,200 units/kg) to a vitamin D3-adequate, P-deficient corn-SBM diet elicited a marked response (P < .05) in weight gain and ash content of fibula, scapula, and metatarsal bones, but dietary addition of 1 alpha-OH D3 (20 micrograms/kg) was without effect. A P- and vitamin D3-adequate, amino acid-deficient corn-SBM diet (15.5% CP) also was supplemented with 1,200 units/kg of phytase to evaluate the efficacy of phytase in improving amino acid utilization. Pigs gained faster (P < .05) and more efficiently (P < .05) when this diet was supplemented with limiting amino acids, and phytase addition also increased (P < .05) weight gain, regardless of whether the diet was deficient or adequate in amino acids. Feed efficiency was improved (P < .05) by phytase addition to the amino acid-deficient diet but not to the amino acid-adequate diet. Pigs fed the low-CP, amino acid-fortified diet gained as fast and as efficiently as those fed a 19.5% CP (1.19% lysine) positive-control diet.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
authors.forename: R R
authors.initials: RR
authors.lastname: Biehl
authors.forename: D H
authors.initials: DH
authors.lastname: Baker
mesh_terms: D010832:6-Phytase / Q000032:analysis / Q000592:standards*; D000596:Amino Acids / Q000032:analysis / Q000172:deficiency* / Q000378:metabolism; D000818:Animals; D004032:Diet / Q000592:standards / Q000662:veterinary*; D005527:Food, Fortified / Q000592:standards*; D006887:Hydroxycholecalciferols / Q000494:pharmacology*; D010758:Phosphorus / Q000032:analysis / Q000172:deficiency* / Q000378:metabolism; D011897:Random Allocation; D013025:Glycine max / Q000592:standards*; D013552:Swine / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D015430:Weight Gain / Q000502:physiology; D003313:Zea mays / Q000592:standards*
chemical_list: D000596:Amino Acids; D006887:Hydroxycholecalciferols; D010758:Phosphorus; D010832:6-Phytase