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영양적 가치에 따른 한우용 배합사료의경제적 사료 가치 분석
이중희 ( Joong Hee Lee ),서자겸 ( Ja Kyeom Seo ),박종수 ( Jong Soo Park ),서성원 ( Seong Won Seo ) 한국축산경영학회 2015 농업경영정책연구 Vol.42 No.1
For the maximum profit, one of the most important decisions to make by the Hanwoo producers is to choose compound feeds for their Hanwoo among a number of commercial products in the market. It is, however, a difficult task due to lack of information and a tool for assessing the value of these compound feeds. This study was conducted to evaluate and compare the economic value of commercial compound feeds for Hanwoo based on their nutritional value. A total of 20 different products (four stages of Hanwoo × five major feed mill companies in Korea) were obtained at the same time and analyzed for their nutrients content. The economic value of each compound feed was caluculated on the basis of the unit costs of nutrients estimated by different methods. We found large variations in the nutrients content between the compound feeds for different stages as well as between those from different companies. Among the stages, the largest variation was observed in the products for finishers between the companies. The economic values of the compound feeds based on the costs of nutrients varied by the stage and by the company; however, the extent of variation in the economic values was less than that in the suggested retail prices of the products. There were also large variations in the ratios of the economic value based on nutritional value to the suggested retail price among the products by both the stage and the company. These results implied that there were differences in the nutrient constraints and feed ingredients used for formulating rations among the companies; therefore, the Hanwoo producers need to consider these differences before making a decision of purchasing compound feeds. The methodology presented in this study should be useful for evaluating the economic value of compound feeds for Hanwoo based on their nutritional value and provide the Hanwoo producers with a decision making tool for choosing compound feeds.
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재고미의 가공처리에 따른 in vitro, in situ 소화율 및 발효성상 평가
양성재,정은상,김한빈,신택순,조병욱,조성근,김병우,서자겸,Yang, Sung-Jae,Jung, Eun-Sang,Kim, Han-Been,Shin, Taek-Soon,Cho, Byung-Wook,Cho, Seong-Keun,Kim, Byeong-Woo,Seo, Ja-Kyeom 한국유기농업학회 2018 韓國有機農業學會誌 Vol.26 No.2
This study was conducted to evaluate the effect of different processing of rice on rumen fermentation in in vitro and in situ experiments. Different processing treatments (extruding, roasting, and steaming) were used in this study and all treatments were ground through a cyclone mill (Foss, Hillerød, Denmark) fitted with a 1 mm screen. Non-treated rice was considered to a control substrate. Then, all treatments were used in in vitro and in situ experiments. Total gas production and dry matter digestibility in control were lower than any other treatment at all incubation times (P<0.01). The lowest ammonia nitrogen ($NH_3-N$) concentration was observed in control among treatments at 6, 12, and 24 h incubation (P<0.01). Extruding had a highest total volatile fatty acids (VFA) concentration at 6, 12 h incubation (P<0.01) and Steaming exhibited a highest total VFA at 24 h (P<0.01). The lowest total VFA concentration was observed in control at 6, 12, and 24 h (P<0.01). In an in situ, The highest value of soluble fraction, degradation rates, effective degradability was observed in extruding (P<0.01). It was considered that feed processing increased dry matter digestibility, total VFA concentration, and decreased pH as well as $NH_3-N$ concentration indicating that processing may increase nutrient degradation of rice in the rumen. 본 연구에서는 재고미의 사료가치 평가를 위해 무처리(Control)를 비롯한 Extruding, Roasting, Steam 처리구들의 영양소 성분분석, in vitro 소화율, in situ 소화율을 분석하였다. In vitro 실험에서 Extruding은 건물 소화율과 gas 발생량이 타 처리구에 비해 상대적으로 높았고, 가장 낮은 pH를 보였으며, 특히 배양 시간 초기에 소화가 신속히 발생하였다. $NH_3-N$ 함량은 배양 6 h 이후에서 Control이 Extruding, Roasting, Steam에 비해 유의적으로 높은 값을 보였고, 이는 가열처리된 단백질의 반추위 미생물의 이용성 저하에 따른 결과로 보이나, 더 정확한 결과를 위해 건물 소화율 분석뿐 아니라 CP 소화율 분석이 필요할 것으로 사료된다. VFA 발생량에서는 Extruding이 다른 처리구들에 비해 배양 6, 12 h에서 유의적으로 높았는데 이는 Extruding 처리구의 분해가 배양 초기에 주로 이어져 발생한 결과로 추정된다. 전분을 발효시키는 박테리아에 의해 높은 비율로 생산되는 propionate 증가 폭에서도 같은 경향을 보였다. In situ 소화율은 in vitro의 소화율과는 다소 차이가 있는 것으로 여겨지나, 이는 실험 방법에 대한 오차로 여겨질 수 있으며, ED(유효분해율)를 통해 in vitro 시험과 소화율의 경향성이 유사한 것을 알 수 있었다. 따라서 본 연구결과를 근거로 상대적으로 적합한 사료가공 처리방법은 무처리, Roasting 및 Steaming인 것으로 보여진다. 또한 무처리(control)의 경우 가공처리에 따른 추가비용 발생이 없으므로 경제적으로 유리할 것으로 판단된다. 재고미가 TMR의 원료로 이용될 수 있다면 국내에서 자급 가능한 사료원료로써 우수한 경제성을 지닐 수 있을 것이다.
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