사료의 일반성분에 관한 연구 2 . 일반성분 분석방법의 비교 = Studies on Chemical Compositions in Feedstuffs 2 . Comparison of Analyzing Methods for Measuring Chemical Compositions in Feedstuffs .

다국어 초록 (Multilingual Abstract)

In order to find out the most reliable and time-saving method, several techniques for analyzing chemical compositions in feedstuffs were compared. 1. No great differences were was found among the contents of moisture in tested feeds determined through 105-110℃ drying method(till constant weight) when compared with the method drying at 135±2℃ for 2 hours. More moisture content was resulted in the method where no air circulation was permitted in oven than the method of air-circulation by fan. And more moisture contents were resulted from the sample feeds which were placed on upper shelf than those from samples placed on lower shelf. 2. The mercury oxide mixture contributed to the digestion of the samples more quickly than copper sulfate mixture as a catalyzes. The direct distillation method. as a more convenient one when compared to the case dilution-distillation system. However, more amount of neutralizing agent and titration solution was needed when the direct distillation was used. The method of ammonia-catching to boric acid was more convenient than that of ammonia-catching to sulfuric or hydrochloric acids, because the only standard solution of hydrochloric acid was necessary instead of two standard solution(acid and basic) in later method. 3. The ether extraction method at 80-85℃ for 8 hours showed similar values for ether extract contents in feedstuffs to those determined at 55℃ for 16 hours, and the former was recommended because of its shorter time. No great differences were brought among ether extract contents dried the raw crude fat for 2, 3, and 4 hours. However, it seemed that 3 hours drying technique should be employed to get more accutate results. 4. The method for drying the residue on filter paper at 135±2℃ for 2 hours was more convenient and time-saving than that at 105-110℃ to get constant weight; that is 2 or 3 times-weighing in the balance in the determination of crude fiber. The technique to use ether-extracted samples was more accurate compared to that using raw samples for the quantitative analysis of crude fiber.