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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0725    [Accepted] Published online January 2, 2019.
Effects of heat stress and rumen–protected fat supplementation on growth performance, rumen characteristics, and blood parameters in growing stage of Korean cattle steers
Hyeok Joong Kang1  , Min Yu Piao1,2  , Seung Ju Park1  , Sang Weon Na1  , Hyun Jin Kim1  , Myunggi Baik1,3,* 
1Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, 1 Gwanak–ro, Gwanak–gu, Seoul 08826, Korea
2Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3Institute of Green Bio Science and Technology, Pyeongchang 25354, Korea
Correspondence:  Myunggi Baik, Tel: +82–2–880–4809, Fax: +82–2–873–2271, Email: mgbaik@snu.ac.kr
Received: 21 September 2018   • Revised: 19 November 2018   • Accepted: 6 December 2018
Abstract
Objective: This study was performed to evaluate whether hot temperature and rumen–protected fat (RPF) supplementation affect growth performance, rumen characteristics, and serum metabolites in growing stage of Korean cattle steers.

Methods

Twenty Korean cattle steers [230.4 ± 4.09 kg of BW, 10.7 ± 0.09 months of age] were divided into a conventional control diet group (n = 10) and a 0.8 % RPF supplementation group (n = 10). Steers were fed 1.5 % BW of a concentrate diet and 4 kg of tall fescue hay for 16 weeks [July 10 to August 6 (P1), August 7 to September 3 (P2), September 4 to October 1 (P3), October 2 to 30 (P4), of 2015].

Results

The mean temperature–humidity index (THI) was higher (P < 0.001) in P1 (76.8), P2 (76.3), and P3 (75.9) than in P4 (50.9). The mean THI of P1–3 were within the alert heat stress (HS) category range according to previously reported categories for feedlot cattle, and the mean THI of P4 was under the thermo-neutral range. Neither month nor RPF supplementation affected (P > 0.05) average daily gain and gain to feed ratio. Month and RPF supplementation affected concentrations of glucose, albumin, and high-density lipoprotein (HDL); those of albumin and glucose tended to decrease (P < 0.10), but HDL concentration increased (P < 0.01) by RPF supplementation. Neither month nor RPF affected (P > 0.05) ruminal pH, NH3–N, and volatile fatty acid concentrations, whereas the C2:C3 ratio was affected (P < 0.05) by month.
Conclusion
Korean cattle may not have been significantly affected by alert HS during the growing stage. Growth performance was higher during hotter months, although some changes in blood metabolites were observed. RPF supplementation affected some blood lipids and carbohydrate metabolites but did not affect growth performance.
Keywords: Ambient Temperature; Beef Cattle; Blood Metabolites; Growth; Heat Stress; Rumen-protected Fat


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