This study was conducted to evaluate the effect of probiotics (Lactobacillus planetarium) relative to chlortetracycline (CTC) supplementation on growth performance, nutrient digestibility, fecal microbiota, fecal score and noxious gas emission in weaning pigs. A total of 135 weanling pigs with an average body weight of 6.61 kg and 28 ± 1 d of age were used in a 6-week feeding trial. The three treatments were (i) CON; control group, feeding with basal diet; (ii) CL; Control + 0.06% probiotic (1.2 × 10⁹ cfu kg⁻¹ of viable L. planetarium) (iii) AT; Control + 0.01% Antibiotic. The dietary supplementation with probiotic or CTC increased (P< 0.05) the body weight (BW), average daily gain (ADG) and gain: feed (G: F) compared with basal diet during 3-6 weeks. Additionally, the CTC group showed significantly higher (P< 0.05) BW, ADG and G: F than probiotic group. During the overall experimental period, pigs fed probiotic or CTC supplemented diet showed higher ADG (P< 0.05) than pigs fed basal diet, the G: F ratio in CTC group was higher (P< 0.05) than basal diet and probiotic group. In the 6th week, the apparent total tract digestibility (ATTD) of nitrogen increased (P< 0.05) for the probiotic or CTC group, the CTC group showed significantly higher (P< 0.05) ATTD of N than probiotic group. The dietary supplementation with CTC or probiotic decreased (P< 0.05) the E. coli counts on d 42. The CTC group showed lower (P< 0.05) E. coli counts than probiotic group. There was no significant difference in gas emission and diarrhea score in all treatments. Probiotic (L. planetarium) at 600mg kg⁻¹ concentration can be suggested as an alternative to growth-promoting probiotics.

进行这项研究以评估益生菌（天生乳酸杆菌）相对于补充金霉素（CTC）对断奶猪生长性能，养分消化率，粪便微生物群，粪便评分和有害气体排放的影响。在为期6周的饲养试验中，使用了135头平均体重为6.61千克，年龄为28±1 d的断奶猪。三种治疗方法是（i）CON；对照组，以基础饮食喂养；（ii）CL；对照+ 0.06％益生菌（1.2×10 ⁹ cfu kg ^-1的活天竺葵）（iii）AT; 对照+ 0.01％抗生素。益生菌或四氯化碳的饮食补充量增加（P<0.05）体重（BW），平均日增重（ADG）和增重：饲料（G：F）与基础饮食在3-6周内相比。此外，CTC组的BW，ADG和G：F显着高于益生菌组（P <0.05）。在整个实验期间，饲喂益生菌或CTC补充日粮的猪的ADG（P <0.05）高于饲喂基础日粮的猪，CTC组的G：F比值高于基础日粮和益生菌的猪（P <0.05）。在第6周，益生菌或CTC组的氮表观总氮消化率（ATTD）增加（P <0.05），CTC组显示明显更高（P<0.05）N的ATTD高于益生菌组。的膳食补充CTC或益生菌降低（P <0.05）在大肠杆菌上d 42计数的CTC组显示出较低（P <0.05）大肠杆菌比益生菌组计数。在所有治疗中，气体排放和腹泻评分均无显着差异。可以建议使用600mg kg ^-1浓度的益生菌（L. planetarium）作为促进生长的益生菌的替代品。