Effects of by-product feed-based silage on feeding, rumination, and excretion in growing Hanwoo heifers

  • Kim, Young-Il (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Lee, Sang Moo (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Lee, Youn Hee (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Lee, Myeon (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Choi, Do Young (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Kwak, Wan Sup (Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University)
  • Received : 2014.09.19
  • Accepted : 2014.12.21
  • Published : 2015.01.31


This study investigated the effects of feeding by-product feed (BF)-based silage on the behavior of growing Hanwoo heifers. Twelve Hanwoo heifers (13.2 months-old, 315 kg body weight; four heifers per pen) were assigned to three diets: a rice straw (RS) diet (concentrate mix and free access to RS), a RS and BF-based silage (RSBFS) diet (concentrate mix and free access to RS and BF-based silage), and a BF-based silage (BFS) diet (concentrate mix and free access to BF-based silage). Behavior was recorded for 5 days using camcorders. Compared to the RS group, the BFS group showed 21.7% higher dry matter intake, shorter feeding, rumination, and chewing times, as well as longer resting time (p < 0.05). Although all groups exhibited similar drinking, urination, and defecation frequencies, the BFS group exhibited higher feeding rates, rumination efficiency, and chewing efficiency than the RS group (p < 0.05). Compared to the BFS group, the RSBFS group showed higher $peNDF_{8.0}$ intake (15.2% vs. 25.0% dry matter intake), longer feeding and sitting times, lower defecation frequency (p < 0.05), and similar rumination efficiency. In conclusion, complete replacement of conventional RS with BF-based silage reduced rumination and chewing activity in growing Hanwoo heifers, and BF-based silage feeding with large-particle straw is an effective approach in improving heifer behavior.


Spent mushroom substrate;By-product feed;Rumination;Behavior;Hanwoo heifer


Grant : Cooperative Research Program for Agriculture Science and Technology Development

Supported by : Rural Development Administration


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