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KMID : 1025520040460010049
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Journal of Animal Science and Technology
2004 Volume.46 No. 1 p.49 ~ p.54
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Effects of Rice Strew and Rice Hull Supplement on Rumination and Chewing Behavior in Hanwoo Steers
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이왕식/Lee, W.S.
이병석/이상철/이상석/이세영/이덕윤/하종규/Lee, B.S./Lee, S.C./Lee, Sang S./Lee, S.Y./Lee, D.Y./Ha, J.K.
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Abstract
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Effects of low quality roughage sources on duration and frequencies of rumination and chewing in Hanwoo steers were determined. Animals were fed three diets; concentrate+rice straw)50:50), concentrate+rice straw+popped rice hull(50:35:15) and concentrate)+rice straw+ground rice hull(50:35:15) to compare both rice straw alone and combination with rice hull. Eating and ruminating time of steers fed concentrate+rice straw(50:50), concentrate+rice straw+popped rice hull(50:35:15) and concentrate+rice straw+ground rice hull(50:35:15) were 78.8 and 338.4min/day; 98.0 and 362.5min/day, and 160 and 519.2min/day, respectively. When steers were fed popped rice hull and ground rice hull, time spent for both eating and ruminating was significantly increased(p<0.05). When steers fed popped and ground rice hull, number of ruminating chews and number of chews per rumination time were significantly decreased(p<0.05). The number of rumination boli and boli per rumination time had significantly decreased(p<0.05) in steers fed both types of rice hull.
In summary, when cattle were fed experimental diets substituted with popped or ground rice hull to rice straw, the rumination behaviors were increased, because popped or ground rice hull might physically stimulate rumen wall. Therefore, both the physically shape and size of roughage sources are important factors to induce rumination behavior.
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