Kansas Agricultural Experiment Station contribution; no. 08-121-S; Swine day, 2007; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 985; Swine; Antibiotics; Phytobiotics


A total of 192 weanling pigs (initially weighing 12.9 lb and 22 ± 2 d of age, PIC) were used in a 42-d growth assay to determine the effects of phytobiotic (Biomin® P.E.P. 125 and 125T) addition to nursery pig diets on post-weaning growth performance. Pigs were blocked by initial weight and randomly allotted to one of four treatments: 1) negative control (feed containing no antibiotic or phytobiotic); 2) negative control + phytobiotic 1 (125 g/ton of Biomin® P.E.P. 125); 3) negative control + phytobiotic 2 (125 g/ton of Biomin® P.E.P. 125T), and 4) positive control (feed containing 140 g/ton of neomycin sulfate and 140 g/ton of oxytetracycline HCl; Neo/OTC). Each treatment had six pigs per pen and eight replications (pens). Phase 1 and Phase 2 diets were fed from d 0 to 14 and d 14 to 42 post-weaning, respectively. Pigs were weighed and feed intake was determined weekly to calculate ADG, ADFI, and F/G. Data were analyzed as a randomized complete block design using the MIXED procedure of SAS with pen as experimental unit. Overall (d 0 to 42), pigs fed Neo/OTC had greater ADG (P0.38) were observed in ADFI between pigs fed the negative control diet and pigs fed either phytobiotic. Pigs fed diets containing either phytobiotic had improved (P0.52) were observed in ADG, ADFI, and F/G between pigs fed diets with phytobiotic 1 and 2. In conclusion, phytobiotics in nursery diets improved post-weaning growth performance compared to pigs fed diets without antibiotics. However, the improvement in growth rate was intermediate between diets fed with and without in-feed antibiotics. Further research is needed to elucidate specific modes of action that caused positive effects in post-weaning growth and efficiency.; Swine Day, 2007, Kansas State University, Manhattan, KS, 2007


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