Biehl R R, Baker D H
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
J Anim Sci. 1996 Dec;74(12):2960-6. doi: 10.2527/1996.74122960x.
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.
选用5周龄、体重8千克的幼猪，来测试1α-羟基胆钙化醇（1α-OH D3）和微生物植酸酶对提高玉米-豆粕（SBM）日粮中植酸磷（P）和氨基酸利用率的效果。在维生素D3充足、磷缺乏的玉米-SBM日粮中添加植酸酶（1200单位/千克），可使幼猪体重增加，腓骨、肩胛骨和跖骨的灰分含量显著增加（P < 0.05），但日粮中添加1α-OH D3（20微克/千克）则无效果。在磷和维生素D3充足、氨基酸缺乏的玉米-SBM日粮（粗蛋白含量15.5%）中也添加1200单位/千克的植酸酶，以评估植酸酶在提高氨基酸利用率方面的效果。当这种日粮添加限制性氨基酸时，幼猪生长更快（P < 0.05）且效率更高（P < 0.05），无论日粮氨基酸缺乏与否，添加植酸酶均能增加（P < 0.05）体重。在氨基酸缺乏的日粮中添加植酸酶可提高饲料效率（P < 0.05），但在氨基酸充足的日粮中则无此效果。饲喂低粗蛋白、氨基酸强化日粮的幼猪，生长速度和效率与饲喂19.5%粗蛋白（1.19%赖氨酸）的阳性对照日粮的幼猪相同。
