Henry P R, Ammerman C B, Miles R D
Departments of Animal Science and Poultry Science, University of Florida, Gainesville 32611.
Poult Sci. 1989 Jan;68(1):107-12. doi: 10.3382/ps.0680107.
The relative bioavailability of Mn from reagent grade Mn monoxide and feed grade Mn-methionine was compared with that from reagent grade Mn sulfate using 288 one-day-old male Cobb chicks. The basal corn-soybean meal diet (93 ppm Mn dry matter basis) was supplemented with 0, 700, 1,400, and 2,100 ppm Mn as Mn sulfate monohydrate, Mn oxide, or Mn-methionine. Additional diets contained 700, 1,400, and 2,100 ppm Mn as sulfate or oxide in combination with .16, .32, or .48% added DL-methionine, respectively, to equalize methionine concentrations in Mn-methionine-containing diets. Diets were fed ad libitum for 3 wk. Tibia and kidney Mn concentrations increased linearly (P less than .001) as dietary Mn increased. Addition of methionine to diets containing sulfate and oxide did not influence (P greater than .10) tissue Mn concentrations. Based on slope ratios from multiple linear regression of bone and kidney Mn concentrations on added dietary Mn from various sources, the respective relative bioavailability values were 96 and 86% from Mn oxide and 108 and 132% from Mn-methionine compared with 100% from Mn sulfate. Except for the first, all values were significantly different from 100%. Thus, Mn from Mn oxide is significantly less available and Mn from Mn-methionine is significantly more available than that from Mn sulfate monohydrate.
使用288只1日龄雄性科布雏鸡，比较了试剂级一氧化锰和饲料级蛋氨酸锰相对于试剂级硫酸锰的相对生物利用率。基础玉米-豆粕日粮（以干物质计锰含量为93 ppm）补充了0、700、1400和2100 ppm的锰，分别以一水硫酸锰、氧化锰或蛋氨酸锰的形式添加。其他日粮分别含有700、1400和2100 ppm的硫酸锰或氧化锰，并分别添加0.16%、0.32%或0.48%的DL-蛋氨酸，以使含蛋氨酸锰的日粮中蛋氨酸浓度相等。日粮自由采食3周。随着日粮锰含量的增加，胫骨和肾脏中的锰浓度呈线性增加（P小于0.001）。在含硫酸盐和氧化物的日粮中添加蛋氨酸对组织锰浓度没有影响（P大于0.10）。根据骨骼和肾脏锰浓度对来自不同来源的日粮添加锰的多元线性回归的斜率比，与硫酸锰的100%相比，氧化锰的相对生物利用率分别为96%和86%，蛋氨酸锰的相对生物利用率分别为108%和132%。除第一个值外，所有值均与100%有显著差异。因此，氧化锰中的锰利用率显著低于一水硫酸锰，而蛋氨酸锰中的锰利用率显著高于一水硫酸锰。
