Asian-Australasian Journal of Animal Sciences

  • 제31권1호
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  • Pages.80-85
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  • 2018
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  • 1011-2367(pISSN)
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  • 1976-5517(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Effect of corn grain particle size on ruminal fermentation and blood metabolites of Holstein steers fed total mixed ration

  • Kim, Do Hyung (Department of Animal Science, Gyeongbuk Provincial College) ;
  • Choi, Seong Ho (Department of Animal Science, Chungbuk National University) ;
  • Park, Sung Kwon (Department of Food Science and Technology, Sejong University) ;
  • Lee, Sung Sill (Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University & Institute of Agriculture and Life Science) ;
  • Choi, Chang Weon (Department of Animal Resources, Daegu University)
  • 투고 : 2017.02.01
  • 심사 : 2017.08.03
  • 발행 : 2018.01.01
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초록

Objective: This study was conducted to investigate the effect of corn grain particle size on ruminant fermentation and blood metabolites in Holstein steers fed total mixed ration (TMR) as a basal diet to explain fundamental data of corn grain for cattle in Korea. Methods: Four ruminally cannulated Holstein steers (body weight $592{\pm}29.9kg$) fed TMR as a basal diet were housed individually in an auto temperature and humidity modulated chamber ($24^{\circ}C$ and 60% for 22 h/d). Treatments in a $4{\times}4$ Latin square design were TMR only (control), TMR with whole corn grain (WC), coarsely ground corn grain (CC), and finely ground corn grain (FC), respectively. The corn feeds substituted for 20% energy intake of TMR intake. To measure the ruminal pH, ammonia N, and volatile fatty acids (VFA), ruminal digesta was sampled through ruminal cannula at 1 h intervals after the morning feeding to determine ruminal fermentation characteristics. Blood was sampled via the jugular vein after the ruminal digesta sampling. Results: There was no difference in dry matter (DM) intake between different corn particle size because the DM intake was restricted to 1.66% of body weight. Different corn particle size did not change mean ammonia N and total VFA concentrations whereas lower (p<0.05) ruminal pH and a ratio of acetate to propionate, and higher (p<0.05) propionate concentration were noted when the steers consumed CC compared with WC and FC. Concentration of blood metabolites were not affected by different particle size of corn grain except for blood triglyceride concentration, which was significantly (p<0.05) increased by FC. Conclusion: Results indicate that feeding CC may increase feed digestion in the rumen, whereas the FC group seemed to obtain inadequate corn retention time for microbial degradation in the rumen.

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참고문헌

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피인용 문헌

  1. Effects of cattle breed and corn processing on ruminal pH and volatile fatty acid concentrations, and apparent digestibility vol.269, pp.None, 2018, https://doi.org/10.1016/j.anifeedsci.2020.114659