Effect of dietary supplemental vitamin A concentration on performance, carcass merit, serum metabolites, and lipogenic enzyme activity in yearling beef steers

T. C. Bryant, J. J. Wagner, J. D. Tatum, M. L. Galyean, R. V. Anthony, T. E. Engle

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A randomized complete block design experiment with 360 single-source black yearling steers (average BW = 316.1 ± 9.1 kg) fed a 91% concentrate (steam-flaked corn base) diet was conducted to evalu-ate the effects of supplemental vitamin A (0, 1,103, 2,205, 4,410, or 8,820 IU/kg of dietary DM) on plasma and liver vitamin A and E concentrations, lipogenic en-zyme activity, marbling score, and performance of year-ling steers. Final BW (586, 580, 590, 585, and 584 kg for 0, 1,103, 2,205, 4,410, and 8,820 IU of supplemental vitamin A/kg of DM, respectively) did not differ (P = 0.39) among treatments. Feed efficiency, ADG, and daily DMI did not differ (P > 0.10) among treatments within each 28-d period or for the overall experiment. From d 57 to slaughter, average DMI (10.33, 10.28, 10.57, 9.75, and 10.22 kg/steer daily for 0, 1,103, 2,205, 4,410, and 8,820 IU of vitamin A/kg of DM, respectively) was less (P < 0.02) by steers receiving 4,410 IU of supplemental vitamin A/kg of dietary DM than for steers in the other treatments. Furthermore, DMI was greater (P = 0.06) for steers receiving 2,205 IU of supplemental vitamin A/kg of dietary DM than for steers receiving 8,820 IU of supplemental vitamin A/kg of DM. Marbling score, HCW, LM area, and 12th-rib fat thickness did not differ (P > 0.10) among treat-ments. Similarly, the percentage of carcasses grading ≥USDA Choice (62.6, 52.8, 64.0, 58.4, and 58.4% for 0, 1,103, 2,205, 4,410, and 8,820 IU of vitamin A/kg of DM, respectively), Select, or ≤Standard did not differ (P > 0.10) among treatments. Except for d 56 (P = 0.050; r = 0.18 for liver retinol), no correlations (P > 0.10) between marbling score and any plasma or liver tissue retinol or α-tocopherol concentrations or vitamin A intake were found, and no differences (P > 0.10) in lipogenic enzyme activity were detected among treat-ments. Taken together with previous and concurrent re-search, results of this experiment suggest that vitamin A supplementation at a concentration up to twice the NRC recommendation has little effect on performance, marbling, or lipogenic enzyme activity in adipose tis-sue samples in yearling feedlot steers, and that 2,205 IU of supplemental vitamin A/kg of DM (20,000 IU/ steer daily) or less is adequate to meet the vitamin A requirements of finishing beef cattle.

Original languageEnglish
Pages (from-to)1463-1478
Number of pages16
JournalJournal of animal science
Volume88
Issue number4
DOIs
StatePublished - Apr 2010

Keywords

  • Beef cattle
  • Carcass quality
  • Lipogenesis
  • Marbling
  • Vitamin a

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