반추가축영양 : 섬유소원의 차이가 한우의 저작행동에 미치는 영향

This experiment was conducted to estimate the effect of different roughage sources, rice straw(RS), wild oat (WO) having high nutritive value and wild oat mixed with baggase(WBM) having high fiber content, on the chewing behavior in eating and ruminating. Three Korean native bulls, averaging 242.3±0.58㎏ body weight, were used for the experiment. The experiment was consisted of a 10-day preliminary and a 2-day collection period with 3×3 Latin squares. Experimental diets contained a 50:50 ratio of roughage to concentrate and were fed at 2.0% level of body weight. An average time spent on eating was 112.2, 63.0 and 52.5 min. and that on ruminating was 355.7, 208.2 and 261.5 min. for RS, WO and WBM, respectively. Ruminating time per DM kg ingested was 73.8, 56.0 and 42.9 min. in RS, WBM and WO, respectively. Total chews a day was highest in RS with the number of 21,876.2 and that in WBM was the number of 16,198.8 which was the level of 74% in comparison to RS. Ruminating period was similar in RS and WBM with 12.5 times and 11.3 times and that in WO was lowest with 6.7 times. Average length of a ruminating period was 31.1, 28.5 and 23.1 min. for WBM, RS and WO, respectively. Ruminating and chewing efficiency (voluntary intake/ruminating and chewing time) was highest in WO with 1,398.98 and 1,473.28 and that in WBM and RS was 1,0728 and 1,1368 and 813.28 and 863.48, respectively. It is concluded that the mixture of wild oat and baggase may expect as substitutional roughage source having high possibility in the point of an improvement of roughage quality and an offer of physical nature into rumen in comparison to rice straw.