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http://dx.doi.org/10.5333/KGFS.2021.41.4.234

Study on Eating Behavior of Holstein Steers by Growth Stages (Bos taurus)  

Hea, Byeong-Joon (Department of Animal Science and Biotechnology, Kyungpook National University)
Kim, Eun Joong (Department of Animal Science and Biotechnology, Kyungpook National University)
Lee, Sang Moo (Department of Animal Science and Biotechnology, Kyungpook National University)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.41, no.4, 2021 , pp. 234-241 More about this Journal
Abstract
This study was carried out to investigate the effects of a different growing stage on the eating and ruminating behavior of Holstein steer (Bos taurus). A total of nine Holstein steers were divided into three growing stage groups (T1: growth stage, 8 months old, T2: Early fattening stage, 15 months old, T3: late fattening stage, 24 months old) with 3 replicates. In the feeding method, concentrate was offered at 1.62% of the body weight per treatment, respectively. And the forage was fed ad libitum for all treatment. The results of behaviors are summarized as follows: The rate of dry matter intake compared to body weight (DMI/BW, %) was high in the order of T1(2.21%) > T2(2.09%) > T3(1.39%). Eating time, ruminating time and resting time were significantly higher in T1, T2 and T3, respectively(p<0.05, 0.01). Chewing time was significantly lower in T3 than in T1 and T2(p<0.01). The number of bolus and the number of total chews were significantly higher in T2 than those of the other treatments(p<0.01). However ruminating time per bolus and the number of bolus per minute were not significantly different among the treatments. The numbers of drinking and defecating were not significantly different among the treatments. The number of urinating was significantly higher T1 than those of the other treatments(p<0.01). Time of drinking, defecating and urinating was not significantly difference among the treatments.
Keywords
Eating Behavior; Ruminating time; Number of bolus; Holstein steers;
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