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25 February 2021 Effect of replacing barley silage with calcium oxide-treated barley straw on rumen fermentation, rumen microbiota, nutrient digestibility, and growth performance of finishing beef cattle
Katelyn R. Stehr, Stephanie A. Terry, Gabriel O. Ribeiro, Robert J. Gruninger, Gregory B. Penner, John McKinnon, Darryl Gibb, Tim A. McAllister
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Abstract

Effect of calcium oxide (CaO) treatment of barley straw and salt on rumen fermentation, microbiota, digestibility, growth, and carcass quality of cattle was assessed. A replicated 4 × 4 Latin square metabolism experiment was conducted using eight heifers fed a wheat finishing diet with barley silage (B-SIL), barley straw (B-S), or 5.0% CaO-treated barley straw (CaOS) with or without NaCl (CaOS-NS). Growth over 115 d was assessed using 75 individually housed steers fed the above diets and an additional diet (I-CaOS), where CaO was added to straw just before feeding. There was no effect (P ≥ 0.08) of diet on rumen fermentation, digestibility, or carcass quality, although CaO decreased (P < 0.001) maximum pH and retained Na was decreased (P < 0.05) by CaOS-NS. Rumen bacterial abundance was altered (P ≤ 0.05) by diet. The average daily gain (ADG) of B-SIL and CaOS-NS steers was 14.1% greater (P ≤ 0.05) than BS and CaOS steers, whereas the gain:feed of CaOS-NS steers was 14.2% greater (P ≤ 0.05) than B-S and CaOS steers. Steers fed I-CaO had similar ADG and gain:feed to other treatments. CaO-treated straw without NaCl could replace barley silage in wheat diets, without compromising digestibility or growth in steers.

Katelyn R. Stehr, Stephanie A. Terry, Gabriel O. Ribeiro, Robert J. Gruninger, Gregory B. Penner, John McKinnon, Darryl Gibb, and Tim A. McAllister "Effect of replacing barley silage with calcium oxide-treated barley straw on rumen fermentation, rumen microbiota, nutrient digestibility, and growth performance of finishing beef cattle," Canadian Journal of Animal Science 101(3), 493-506, (25 February 2021). https://doi.org/10.1139/cjas-2020-0071
Received: 7 May 2020; Accepted: 16 November 2020; Published: 25 February 2021
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KEYWORDS
alkaline treatment
beef cattle
bovins à bœuf
calcium oxide
microbiota
microbiote
oxyde de calcium
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