Response of barrows to space allocation and ractopamine

M. C. Brumm, P. S. Miller, R. C. Thalert

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24 Scopus citations


An experiment using 264 crossbred barrows was conducted to examine the interaction between space allocation and dietary ractopamine addition on pig performance and carcass characteristics using a 2 x 2 factorial arrangement of treatments. Treatments were 0.55 (19 pigs per pen) or 0.74 (14 pigs per pen) m2/pig from start (29.7 ± 0.1 kg BW) to slaughter (108 kg BW) in a fully slatted facility and O or 10 ppm (asfed basis) ractopamine for 28 d before slaughter. There were few treatment interactions. Pigs given 0.55 m 2/pig had a lower ADG (P = 0.010), ADFI (P = 0.088), 10th-rib backfat depth on d 86 (P = 0.010), and carcass loin muscle depth (P = 0.011) than pigs given 0.74 m2/ pig. There was no difference in feed conversion (P = 0.210) as a result of space allocation. Pigs fed diets containing 10 ppm ractopamine had decreased (P = 0.004) ADFI and improved (P = 0.001) feed conversion efficiencies for the 28-d feeding period, along with greater loin depth (P = 0.005) and carcass lean percent (P = 0.001). The improvements in 28-d carcass lean growth associated with feeding 10 ppm ractopamine resulted in an improvement in overall daily fat-free lean gain (P = 0.046). Under these experimental conditions, the response to dietary ractopamine was similar for crowded and uncrowded pigs.

Original languageEnglish (US)
Pages (from-to)3373-3379
Number of pages7
JournalJournal of animal science
Issue number11
StatePublished - Nov 2004


  • Pigs
  • Ractopamine
  • Space Allocation

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics


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