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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1994;7(2): 273-277.
DOI: https://doi.org/10.5713/ajas.1994.273    Published online June 1, 1994.
Studies on the utilization of rice straw by sheep IV. Effect of soybean meal and barley supplementation on eating and rumination behavior
L. Warly, A. Fariani, O. P. Mawuenyegah, T. Matsui, T Fujihara, T. Harumoto
Abstract
A 3 횞 3 latin square design experiment was conducted to study eating and rumination behavior in sheep fed rice straw (RS) supplemented with soybean meal (SBM) and barley at three different levels of crude protein: low (40 g CP/d, LCP), medium (67 g/d, MCP) and high (94 g/d, HCP). In addition, all the supplements were formulated to contain the same amount of total digestible nutrients (TDN; 275 g). Daily time spent eating and eating rate of RS were not affected by any supplementation. However, time spent ruminating in sheep fed HCP diet was markedly shorter (p<0.05) than in those fed LCP and MCP diets. Rumination index (ruminating time/100 g DM intake) was also significantly reduced (p<0.05) by increasing level of protein supplementation. Although no significant differences were observed, the daily number of rumination periods tended to be lower, while daily number of boli regurgitated was considerably higher in sheep fed HCP diet than in those fed LCP and MCP diets. Increasing level of protein supplementation did not affect the number of chews per bolus, bolus time and rate of chewing during rumination. It is suggested that increasing level of protein supplementation was associated with more effective microbial reduction of rumen digesta particle size and consequently reduced the time spent ruminating.
Keywords: Rice Straw; Soybean Meal; Barley; Rumination Behavior


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