The Ohio State University and The Ohio Agricultural Research and Development Center, Columbus 43210-1095, USA.
J Anim Sci. 2012 Sep;90(9):3012-22. doi: 10.2527/jas.2011-4424. Epub 2012 Jun 4.
The effect of dietary phytase and the prebiotic inulin on apparent mineral digestibility, bone mineralization, and tissue mineral contents was evaluated in weanling and growing pigs. In Exp. 1, inulin and phytase were incorporated in a 2 × 3 factorial arrangement of treatments with 8 replicate pens per treatment in a randomized complete block design. There were 2 levels of phytase [0 and 1000 phytase units (FTU)/kg] and 3 levels of chicory inulin (0, 3, and 6%). Weanling pigs (17 d of age; 5 or 4 pigs per pen) with an initial BW of 6.0 ± 0.6 kg were evaluated for 35 d postweaning. Macromineral digestibility was calculated using chromic oxide as an index in fecal samples collected during the final week of the experiment in replicates 1 through 4. On d 36, 1 pig per pen was killed and the heart, liver, kidney, and left tibia were excised and weighed. Inulin did not have any effect on growth performance measurements. Phytase increased (P < 0.05) BW on d 35 and ADG and ADFI during the 21-to-35-d and 0-to-35-d periods. Inulin did not result in increased tissue mineral concentrations on a per unit (mg/kg) or total tissue basis. Phytase increased (P < 0.05) the concentration of Zn in the liver, Mn and Zn in the heart, and Mg and Mn in the kidney. Phytase also increased (P < 0.05) total P, Mg, S, Mn, Se, and Zn in the liver as well as tibia ash. Phytase increased the digestibility of Ca (P < 0.01) and P (P < 0.05). Experiment 2 was conducted with growing pigs (initial BW, 41 ± 5 kg) to evaluate 2 levels of inulin (0 or 6%) and 2 levels of phytase (0 or 1000 FTU/kg) in a 2 × 2 factorial with 6 replicates in a randomized complete block design. Total urine and feces were collected for 10 d from each of 24 barrows after a 21-d acclimation period. Inulin inclusion resulted in reduced Ca digestibility (P < 0.05). Phytase increased (P < 0.05) the digestibility of both Ca and P. These results indicate that dietary inulin does not affect the overall mineral status or growth performance of pigs, whereas phytase increases the utilization of Ca and several microminerals, in addition to P, and also increases growth performance. Inulin and phytase do not appear to interact to affect pig growth or mineral status.
在断奶和生长猪中评估了日粮植酸酶和益生元菊糖对表观矿物质消化率、骨矿化和组织矿物质含量的影响。在实验 1 中，菊糖和植酸酶以 2×3 因子处理排列，每个处理有 8 个重复栏，采用随机完全区组设计。植酸酶有 2 个水平[0 和 1000 植酸酶单位（FTU）/kg]和菊糖 3 个水平（0、3 和 6%）。断奶仔猪（17 日龄；每栏 5 或 4 头猪）断奶后 35 天进行评估。在试验的最后一周，使用粪便样品中铬氧化合物作为指标，收集 1 到 4 个重复的粪便样本，计算大矿物质消化率。在第 36 天，每栏杀死 1 头猪，取出心脏、肝脏、肾脏和左侧胫骨并称重。菊糖对生长性能测量没有任何影响。植酸酶增加（P<0.05）断奶后第 35 天的 BW、21 至 35 天和 0 至 35 天的 ADG 和 ADFI。菊糖不会导致单位（mg/kg）或总组织基础上组织矿物质浓度增加。植酸酶增加了肝脏中 Zn、心脏中 Mn 和 Zn、肾脏中 Mg 和 Mn 的浓度。植酸酶还增加了（P<0.05）肝脏中总 P、Mg、S、Mn、Se 和 Zn 以及胫骨灰分。植酸酶增加了 Ca（P<0.01）和 P（P<0.05）的消化率。实验 2 用生长猪（初始体重 41±5kg）进行，评估了 2 个水平的菊糖（0 或 6%）和 2 个水平的植酸酶（0 或 1000FTU/kg）在 2×2 因子的随机完全区组设计中，每个处理有 6 个重复。24 头阉公猪在适应期 21 天后，收集 10 天的总尿液和粪便。添加菊糖会降低 Ca 的消化率（P<0.05）。植酸酶增加了（P<0.05）Ca 和 P 的消化率。这些结果表明，日粮菊糖不会影响猪的整体矿物质状况或生长性能，而植酸酶除了 P 之外，还增加了 Ca 和几种微量元素的利用率，并提高了生长性能。菊糖和植酸酶似乎不会相互作用影响猪的生长或矿物质状况。
