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



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



Korean Journal of Animal Nutrition and Feedstuffs 12(6): 306-313



This experiment was conducted to evaluate the chemical compositions of the mixed feeds (1981 .apprx. 1982, 1984 .apprx. 1985) collected from feed plants located in different districts at four seasons. The results are summarized as follows: 1. Seasonal changes of mixed feeds of first-collection: crude protein contents showing the highest values were found in spring (Chick starter, 19.24%; Broiler starter, 20.54%; Layer I, 16.97%; Pig grower, 16.08%) and summer (Lactation III, 18.08%). But there were little seasonal differences in other general compositions. Calcium contents showing the highest values were found in summer (Chick starter 1.5%), autumn (Layer I, 3.72%) and winter (Pig grower, 1.34%). On the other hand, according to mixed feeds of second-collection, the crude protein contents of Chick starter, Layer I, Pig starter, Pig grower, Lactation III showed the highest values in winter. The crude fat contents showed the highest values in autumn (Broiler starter, 4.07%). Generally, mixed feeds of second-collection showed lower values in spring. 2. Regional differences of mixed feeds of first-collection-chemical composition:crude protein contents showed the highest values in Seoul (Chick starter, 19.25; Pig grower, 16.33%; Lactation III, 18.39%) and Jeonra (Layer I, 17.20%). There were little regional differences in the contents of crude fat, crude fiber, crude ash and phosphorus, but Ca contents showed the highest values in Jeonra (Chick starter, 1.69%; Layer I, 2.78%) and Chungcheong (Broiler starter, 1.64%). According to mixed feeds second-collection, crude protein contents showed the highest values in Incheon (Broiler starter, 21.79%; Pig starter, 19.56%) and Busan (Layer I, 17.00%: Pig grower, 17.69%; Lactation III, 18.28%). Crude fat contents showed little differences among areas but layer I showed the highest values in Incheon (3.52%) and the lowest value in Jeonra (2.81%) 3. Regional differences of mixed feeds of second-collection-mineral contents:calcium contents showed the highest values in Jeonra(Layer I, 4.01%) and Kyungsang (Lactation III, 1.34%) and the lowest value in Jeonra (Chick starter, 0.88%). The contents of phoshorus and magnesium showed little differences among areas. Miro elements contents of Chick starter, Layer I, Lactation III showed some differences related to areas and tended to be higher than NRC(1984) requirements but were not high enough to reach toxic levels. 4. Regional differences of mixed feeds of second-collection-amino acid contents:lysine contents were higher in Kyunggi samples (Broiler starter, 1.1426%; Layer I, 0.7628%; Pig starter, 1.0054%) than others. Methionine content was highest in the samples of Jeonra (Broiler starter, 0.4275%; Pig starter, 0.3033%) and Seoul (Layer I, 1.2920%). There were some differences in the content of histidine, arginine, valine in the samples collected from different regions.

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