Hill D A, Peo E R, Lewis A J, Crenshaw J D
J Anim Sci. 1986 Jul;63(1):121-30. doi: 10.2527/jas1986.631121x.
Two experiments were conducted to determine the effect of sources of dietary zinc on gain, feed conversion and blood and bone traits of swine. In the first experiment 96 pigs were used in a 28-d study. The pigs were fed diets with no supplemental Zn or with either 9 or 12 ppm supplemental Zn from zinc sulfate (ZnSO4), zinc methionine (ZnMet) or zinc methionine with picolinic acid (ZnMet w/PA), each with or without 5% added corn oil. There were differences (P less than .05) in average daily gain (ADG) and average daily feed intake (ADFI) between the pigs fed the two organic Zn sources, with those fed ZnMet w/PA showing the better gains and feed conversion. However, neither organic Zn source resulted in pig performance that was different from either the diet with no supplemental Zn or the diets supplemented with Zn from ZnSO4. In the second experiment the same dietary Zn sources and treatments were fed as in Exp. 1 except that corn oil was deleted as a variable. No differences in ADG, ADFI, feed/gain (F/G) or in changes in serum Zn or Cu were observed among treatments during either the 21-d nursery or the 56-d growing periods. During the subsequent 56-d finishing period ADG and ADFI were greater (P less than .01) for pigs fed the Zn-supplemented diets than for those fed the diets without supplemental Zn. There were no differences among treatments in F/G during the finishing period. Zn content of bone ash was lower (P less than .01) in the non-Zn-supplemented pigs. These data suggest that the Zn sources used are of similar biological value and do not support the theory that picolinic acid aids Zn absorption.
进行了两项试验以确定日粮锌源对猪的生长、饲料转化率以及血液和骨骼特性的影响。在第一项试验中，选用96头猪进行为期28天的研究。给猪饲喂不添加锌的日粮，或添加9或12 ppm硫酸锌（ZnSO4）、蛋氨酸锌（ZnMet）或含吡啶甲酸的蛋氨酸锌（ZnMet w/PA）的日粮，每种日粮添加或不添加5%玉米油。饲喂两种有机锌源的猪之间平均日增重（ADG）和平均日采食量（ADFI）存在差异（P<0.05），饲喂ZnMet w/PA的猪生长性能和饲料转化率更佳。然而，两种有机锌源均未使猪的生长性能与不添加锌的日粮或添加ZnSO4锌的日粮产生差异。在第二项试验中，饲喂与试验1相同的日粮锌源和处理方式，但去掉玉米油这一变量。在21天的保育期或56天的生长期内，各处理组之间的ADG、ADFI、料重比（F/G）或血清锌或铜的变化均无差异。在随后56天的育肥期，饲喂添加锌日粮的猪ADG和ADFI高于（P<0.01）不添加锌日粮的猪。育肥期各处理组之间F/G无差异。不添加锌的猪骨灰锌含量较低（P<0.01）。这些数据表明，所使用的锌源具有相似的生物学价值，并不支持吡啶甲酸有助于锌吸收的理论。
