A total of 360 weanling pigs (DNA 200 x 400; initially 9.7 ± 0.23 kg BW) were used in a 21-d growth trial to evaluate the effects of commercial diet acidifiers in nursery diets. Upon weaning, pigs were weighed and allotted to pens (6 pigs/pen, 10 replicate pens/treatment, blocked by 2 separate nursery rooms) and pens were then randomly assigned to one of 6 treatment diets: 1) negative control (no antibiotics or acidifiers) and the control with 2) 0.25% Acidifier A (KEM-GEST™, Kemin Industries, Des Moines, IA); 3) 0.3% Acidifier B (ACITVATE® DA, Novus International, Saint Charles, MO); 4) 0.5% Acidifier C (OutPace®, PMI Additives, Arden Hills, MN); 5) 50 g/ton carbadox; 6) 400 g/ton chlortetracycline. Pigs were fed common phase 1 and phase 2 starter diets without antimicrobials for 21 days, then fed experimental diets for 21 days. Data were analyzed as a completely randomized block design with pen as the experimental unit. Dietary treatment significantly impacted (P < 0.05) all growth response criteria for each week of the experiment. Overall (d 0 to 21), ADG was the greatest (P < 0.0001) for pigs fed a diet containing CTC. Likewise, ADFI was increased (P < 0.0001) for pigs consuming CTC compared to those fed the negative control, acidifier A, acidifier B and carbadox diets, while those fed acidifier C were intermediate. Feed efficiency was poorest (P < 0.0001) in pigs fed a diet with carbadox. By the end of the experiment, pigs fed CTC were significantly heavier (P < 0.0001) than pigs fed all remaining treatments. In summary, feeding CTC improved nursery pig performance while carbadox unexpectedly reduced it. The addition of dietary acidifiers did not improve growth performance compared to a negative control.

中文翻译：

---

185商业日粮酸化剂对保育猪生长性能的影响

共有 360 头断奶仔猪（DNA 200 x 400；最初 9.7 ± 0.23 kg 体重）用于 21 天的生长试验，以评估商业日粮酸化剂在保育日粮中的作用。断奶后，将猪称重并分配到猪栏（6 头猪/栏，10 个重复栏/处理，由 2 个单独的保育室封闭），然后将猪栏随机分配到 6 种处理饮食中的一种：1）阴性对照（无抗生素或酸剂）和对照 2) 0.25% 酸化剂 A (KEM-GEST™, Kemin Industries, Des Moines, IA)；3) 0.3% 酸化剂 B (ACITVATE® DA, Novus International, Saint Charles, MO)；4) 0.5% 酸化剂 C (OutPace®, PMI Additives, Arden Hills, MN)；5) 50克/吨卡巴多斯；6）400克/吨金霉素。给猪喂食不含抗菌剂的普通第一阶段和第二阶段起始日粮 21 天，然后喂食实验日粮 21 天。数据分析为完全随机区组设计，以笔为实验单位。饮食治疗显着影响 (P < 0.05) 实验每周的所有生长反应标准。总体而言（d 0 至 21），饲喂含 CTC 日粮的猪的 ADG 最大（P < 0.0001）。同样，与饲喂阴性对照、酸化剂 A、酸化剂 B 和卡巴多斯日粮的猪相比，饲喂 CTC 的猪的 ADFI 增加（P < 0.0001），而饲喂酸化剂 C 的猪处于中等水平。饲喂卡巴多的猪的饲料效率最差（P < 0.0001）。到实验结束时，喂食 CTC 的猪比喂食所有其余处理的猪明显更重 (P < 0.0001)。总之，饲喂 CTC 提高了保育猪的性能，而卡巴多则出人意料地降低了它。