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Studies on the quality estimation for feed ingredients and mixed feeds in korea i. seasonal changes and regional differences in chemical compositions of feed ingredients



Studies on the quality estimation for feed ingredients and mixed feeds in korea i. seasonal changes and regional differences in chemical compositions of feed ingredients



Korean Journal of Animal Nutrition and Feedstuffs 12(6): 298-305



This study was undertaken to evaluate the chemical compositions of major feed ingredients. Feed ingredients (664 samples) were collected from feed plants located in different areas at four seasons. Feed ingredients collected (1981-1982, 1984-1985) were chemically analyzed to compare the contents of moisture, crude protein, crude fat, crude fiber, crude ash, calcium and phosphorus. Feeds collected during summer were chemically analyzed at the intervals of six months to observe the changes in chemical composition as affected by storage periods. The results are summarized as follows: 1. Among the contents of various nutrients of major feed ingredients, the moisture contents of feed ingredients were lower and ash contents were higher in summer and higher values in ash contents. In other nutrients contents, there were some variations by seasons compared with NRC data (1977, 1978, 1979). The feed ingredients except corn grain showed lower crude protein value but higher values in moisture, crude ash and crude fiber contents. 2. Feed ingredients were classified according to collected area to compare the variations in chemical composition. For corn, crude protein content of corn collected from Kyunggi district showed the highest value (9.03%) of all areas. Crude protein content of soybean meal showed the lowest value (43.19%) in kyunggi district and crude fat content was the highest value (2.22%) in Chung-cheong district. Rapeseed meal contained less crude protein (32.01%) in Incheon district, more crude ash content (9.38%) in Jeonra district and more crude fat (2.38%) in Seoul district than others. 3. As the storage period was extended from 0 to 12 months crude protein and crude fiber contents of feedstuffs decreased while NFE and crude ash contents increased.

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