ABSTRACT. Thirty-six castrated, seven months-old Hanwoo steers (initial body weight: 184 ± 5.2kg) were assigned to three treatments over 23 months to evaluate the effects of supplementation with bentonite (0, 0.1 and 0.3%) on growth performance and carcass and meat characteristics. A completely randomized design with three replicates was used. The inclusion of a bentonite-supplemented diet had an influence on final weight, total weight gain, and average daily gain. Bentonite supplementation had no significant effect on proximate composition and meat quality. For carcass characteristics, there were no significant differences in yield traits and quality traits between treatments (but not cold carcass weight, marbling score, and quality grade). It was concluded that supplementation with bentonite (0.1 and 0.3%) improved growth performance, cold carcass weight, marbling score and quality grade compared with the control, except for meat quality.Keywords: bentonite, Hanwoo steers, quality traits, yield traits.Desempenho, qualidade da carne e características de carcaça em novilhos Hanwoo em crescimento e engorda alimentados com bentonita RESUMO. Para avaliar os efeitos da suplementação com bentonita (0, 0,1 e 0,3%) sobre o desempenho de crescimento e características da carcaça e da carne, foram avaliados 36 novilhos Hanwoo, castrados, com sete meses de idade (peso inicial: 184 ± 5,2 kg) distribuídos nos três tratamentos. Utilizou-se um delineamento inteiramente casualizado com três repetições. A inclusão de uma dieta suplementada com bentonita teve influência no peso final, ganho de peso total e ganho médio diário. A suplementação com bentonita não teve efeito significativo na composição centesimal e na qualidade da carne. Para as características de carcaça, não houve diferenças significativas nas características de rendimento e de qualidade entre os tratamentos (mas não o peso da carcaça fria, nível de marmoreio e grau de qualidade). Concluiu-se que a suplementação com bentonita (0,1 e 0,3%) melhorou o desempenho de crescimento, peso de carcaça fria, nível de marmoreio e grau de qualidade em relação ao controle, com exceção da qualidade da carne.Palavras-chave: bentonita, novilho Hanwoo, características de qualidade, características de rendimento.

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: The purpose of this study is to survey on parents' preference and estimate parents' Willingness to pay(WTP) for after-school rural experience program in daegu city by choice experiment(CE). The results of this study are as follows; First, we divided after-school rural experience program into three types, namely: nature seeing, play exercise and learning experience. Second, the study has shown that parents prefer learning experience among those after-school rural experience programs. Among attributes which form a experience program, instructor certificates, consuming time and expense for participant are statistically effecting significant impact. Third, the result of estimation on willingness to pay for development of after-school rural experience program is as follow. The willingness to pay for learning experience is 6,337won, willingness to pay for instructor certificates is 14,102wonand it for consuming time is 2,926won. Therefore, composition centering learning experience is better and instructor who has expert certificate is required. It is much better to compose that the consuming time is longer and the expense for experience is lower. But there is limitation because this survey was conducted based on an assumption, so it could read over estimation problem. The result of this study may provide useful information to develop after-school rural experience program using rural resources and to improve rural tourism policy.