Adeola O, Lawrence B V, Sutton A L, Cline T R
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907-1151, USA.
J Anim Sci. 1995 Nov;73(11):3384-91. doi: 10.2527/1995.73113384x.
Forty-eight pigs (barrows:gilts, 1:1) with an average initial weight of 9.4 kg were used in a 2 x 2 factorial experiment to determine the influence of dietary phytase (0 or 1,500 phytase units/kg) and zinc (0 or 100 mg/kg) supplementation of a corn-soybean meal diet on the utilization of P, Ca, Cu, Mg, Mn, and Zn. After a 21-d growth experiment, feed was withheld for 24 h and blood was collected from the anterior vena cava of all pigs for plasma mineral analyses. Twenty-four barrows from the growth experiment were then placed in metabolism cages and used in an 8-d mineral balance study. All pigs were maintained on their previous diet. Growth rate was fastest (P < .05) and feed efficiency was highest (P < .05) for pigs fed phytase-supplemented diets. Feed intake was unaffected (P > .05) by dietary treatment. Plasma P (P < .01) and Mg (P < .05) concentrations increased with phytase addition. Plasma Zn concentration increased (P < .05) when phytase was added to the diet containing no supplemental Zn, but plasma Zn concentration was not affected (P > .05) by phytase when the diet was supplemented with 100 mg of Zn/kg. Apparent Ca, P, and Cu balance were improved (P < .05) with phytase addition; however, Cu balance was reduced (P < .05) by Zn supplementation. Zinc balance was increased (P < .05) with supplemental zinc and phytase in the diet. These results indicate that the growth-promoting effect of phytase may be due to an overall increase in the availability of minerals.
选用48头平均初始体重为9.4 kg的猪（公猪：母猪，1:1）进行2×2析因试验，以确定在玉米-豆粕型日粮中添加植酸酶（0或1500植酸酶单位/kg）和锌（0或100 mg/kg）对磷、钙、铜、镁、锰和锌利用率的影响。经过21天的生长试验后，停饲24小时，从所有猪的前腔静脉采集血液用于血浆矿物质分析。然后将生长试验中的24头公猪放入代谢笼中，用于为期8天的矿物质平衡研究。所有猪均维持之前的日粮。饲喂添加植酸酶日粮的猪生长速度最快（P < 0.05），饲料效率最高（P < 0.05）。日粮处理对采食量无影响（P > 0.05）。添加植酸酶后血浆磷（P < 0.01）和镁（P < 0.05）浓度升高。在不添加锌的日粮中添加植酸酶时，血浆锌浓度升高（P < 0.05），但在日粮中添加100 mg/kg锌时，植酸酶对血浆锌浓度无影响（P > 0.05）。添加植酸酶可改善表观钙、磷和铜平衡（P < 0.05）；然而，添加锌会降低铜平衡（P < 0.05）。日粮中添加锌和植酸酶可提高锌平衡（P < 0.05）。这些结果表明，植酸酶的促生长作用可能归因于矿物质利用率的总体提高。
