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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0658    [Accepted] Published online December 24, 2019.
Nutritional value and in situ degradability of oak wood roughage and its feeding effects on growth performance and behavior of Hanwoo steers during the early fattening period
Ye Ri Ju1  , Youl Chang Baek2  , Sun Sik Jang2  , Young Kyoon Oh2  , Sung Suk Lee3  , Yong Sik Kim4  , Keun-kyu Park5,* 
1Cargill Agri Purina, Inc. Gunsan Plant, Jeonbuk 54007, Korea
2National Institute of Animal Science, Rural Development Administration, Jeonbuk 55365, Korea
3Division of Wood Chemistry, Department of Forest Products, National Institute of Forest Science, Seoul, 02455, Korea
4Division of Forest Material Science and Engineering, Kangwon National University, Chuncheon 24341, Korea
5Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
Correspondence:  Keun-kyu Park, Tel: +82-2-450-3661, Fax: +82-2-455-1044, Email: kkpark@konkuk.ac.kr
Received: 20 August 2019   • Revised: 1 October 2019   • Accepted: 12 December 2019
This study was conducted to evaluate changes in nutritional value and in situ DM degradability of oak and pine wood before and after steam-digestion process (60 min/ 160 ℃/ 6 atm) and feeding effect of the oak roughage on performance and behavior of Hanwoo steers.
Chemical composition and tannin concentration were analyzed for oak and pine trees before and after the pretreatment. In situ DM and effective degradability (ED) of these samples were assessed using a nylon bag method. In vivo trial was performed to estimate animal performance and behavior, using steers fed TMR diets containing 0 (control), 25 (OR-25) and 50% (OR-50) of the oak roughage. Eighteen steers were allocated into nine pens (2 steers/pen, 3 pens/treatment) for 52days according to BW and age.
By the steam-digestion treatment, the NDF was decreased from 86.5 to 71.5% for oak and from 92.4 to 80.5% for pine, thereby increasing NFC (non-fiber carbohydrate). In situ DM degradability of treated oak reached 38% at 72 h, whereas that of untreated oak was only 11.9%. The 0 h degradability of the treated pine increased from 5.9 to 12.1%, but the degradability was unchanged thereafter. Animal performance including BW, ADG, DMI and FCR was not different among control and oak treatments. No differences were detected in animal behavior such as lying, standing, rumination, drinking, and eating, except walking. Walking was higher in control than oak treatments with numerically higher eating and lower lying times, probably due to bulkier characteristics of rice straw in the diet.
This study demonstrates that the oak roughage can be substituted for 50% of total forage or 100% of rice straw in TMR diets at early fattening stage of Hanwoo steers.
Keywords: Oak Roughage; Steam Digestion; Animal Performance; Animal Behavior; Rumen Degradability

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