Effects of live cultures of Lactobacillus acidophilus (strains NP45 and NP51) and Propionibacterium freudenreichii on performance, carcass, and intestinal characteristics, and Escherichia coli strain O157 shedding of finishing beef steers

N. A. Elam, J. F. Gleghorn, J. D. Rivera, M. L. Galyean, P. J. Defoor, M. M. Brashears, S. M. Younts-Dahl

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88 Scopus citations

Abstract

In Exp. 1,240 beef steers (initial BW = 332.8 kg) were used to determine the effects of Lactobacillus acidophilus (LA) plus Propionibacterium freudenreichii (PF) on performance, carcass, and intestinal characteristics; serum IgA concentrations; and the prevalence of Escherichia coli O157 (EC). Cattle were fed a steam-flaked corn-based, 92% concentrate diet, and the four direct-fed microbial (DFM) treatments (12 pens/treatment) included in a randomized complete block design were as follows: 1) control, lactose carrier only (CON); 2) 1 × 109 cfu of LA NP51 plus 1 × 10 6 cfu of LA NP45 plus 1 × 109 cfu of PF NP24 per animal daily (LA45-51H); 3) 1 × 109 cfu of LA NP51 plus 1 × 109 cfu of PF NP24 per animal daily (LA51); and 4) 1 × 106 cfu of LA NP51 plus 1 × 106 cfu of LA NP45 plus 1 × 109 cfu of PF NP24 per animal daily (LA45-51L). No differences (P > 0.10) were detected for pen-based performance data. The average lamina propria thickness for LA51 and LA45-51H steers was less (P = 0.02) than the average for CON and LA45-51L steers. Moreover, LA51 and LA45-51H steers had a lower (P = 0.06) prevalence of EC shedding than CON and LA45-51L steers. In Exp. 2, 660 steers fed 91% concentrate, steam-flaked corn-based diets were used to determine the effects of the following DFM treatments (10 pens/treatment) on performance, carcass, and intestinal characteristics: 1) control, lactose carrier only (CON); 2) 5 × 106 cfu of LA NP51 plus 5 × 106 cfu of LA NP45 plus 1 × 109 cfu of PF NP24 per animal daily (LA45-51L); and 3) 1 × 109 cfu of LA NP51 plus 5 × 106 cfu of LA NP45 plus 1 × 10 9 cfu of PF NP24 per animal daily (LA45-51H). Steers were from two weight groups (WG). One group (SDOF; BW at arrival = 351.5 kg) had grazed before arrival, and the other group (LDOF; BW at arrival = 314 kg) had been in a grower yard. A split plot was used with WG as the whole-plot factor and DFM in the split plot. There was an interaction of WG and DFM for ADG (P = 0.05) and for carcass-adjusted ADG (P = 0.08). The simple-effect ADG and carcass-adjusted ADG means for DFM treatments differed (P ≤ 0.01) between WG classifications. Within SDOF, ADG for CON and LA45-51L did not differ (P = 0.70), but both were less (P ≤ 0.08) than for LA45-51H. Overall, these data indicate that live cultures of LA plus PF did not greatly affect feedlot performance and carcass characteristics. Some of the DFM used decreased fecal EC shedding, which might be related to the results for ileal lamina propria thickness.

Original languageEnglish
Pages (from-to)2686-2698
Number of pages13
JournalJournal of animal science
Volume81
Issue number11
DOIs
StatePublished - Nov 2003

Keywords

  • Escherichia coli O157
  • Fattening Performance
  • Feed Intake
  • Intestinal Mucosa
  • Lactobacillus acidophilus
  • Propionibacterium freudenreichii

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