Mineral retention of growing and finishing beef cattle across different production systems1

A. K. Watson, K. E. Hales, M. J. Hersom, G. W. Horn, J. J. Wagner, C. R. Krehbiel, M. P. McCurdy, G. E. Erickson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Calcium, P, Mg, K, and S retention in carcass, offal, and viscera were measured in 2 beef cattle experiments. Experiment 1 used 30 steers (245 kg of BW; SE = 4 kg) wintered at 3 levels of gain: grazing wheat pasture at a (1) high or (2) low rate of gain or (3) grazing dormant native range, and all were finished on a common diet (71% corn, 9% cottonseed hulls, 5.35% soybean meal). Experiment 2 used 46 steers (240 kg of BW; SE = 4 kg) fed 3 growing diets with similar rate of gain: (1) sorghum silage, (2) program-fed high-concentrate diet, or (3) wheat-pasture grazing, or placed directly into the feedlot. In Exp. 1, retention of Mg, K, and S (g/100 g of protein gain) during the finishing period was greater for treatments wintered at a low rate of gain during the growing period (P ≤ 0.02). There were no treatment differences for P or Ca retention during the finishing period (P ≥ 0.39). In Exp. 2, no differences were noted due to treatment (P ≥ 0.25) or feeding period (P ≥ 0.37) for Ca, P, Mg, K, and S retention (g/100 g of protein gain). Concentrations of Cu, Fe, Mn, and Na were greater in offal than carcass tissues in both experiments (P < 0.01). In both experiments, expressing mineral retention on a protein gain basis minimized effects due to BW or rate of gain, allowing for a better comparison of mineral retention across a variety of animals and diets.

Original languageEnglish
Pages (from-to)250-260
Number of pages11
JournalProfessional Animal Scientist
Volume34
Issue number3
DOIs
StatePublished - Jun 2018

Keywords

  • beef cattle
  • calcium
  • mineral requirement
  • mineral retention
  • phosphorus

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