Analysis and Evaluation of Nutritional Composition of Yangtze River- coilia Meat at Different Ovarian Development Stages
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Abstract:
The nutritional components in the meat of Yangtze River-Coilia at different ovarian development stages (stage II, stage III, stage IV, and stage V) were studied and evaluated in this paper. The crude fat content declined significantly; the moisture and crude protein contents increased significantly (p<0.05), and the ash content decreased after the initial increase from stages II to V. These results indicated that fat was the main energy source during ovarian development. Given that fatty acids are the first to be decomposed for energy, mono-unsaturated fatty acid levels showed a downward trend during all stages of ovarian development. However, the fatty acids with the highest contents were C16:1 and C18:1 at different ovarian-development stages, indicating that they may be the principal metabolic fuels. The contents of the n-3 unsaturated fatty acids, especially those of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), decreased significantly from stages II to V (p<0.05). In contrast, amino acid contents increased significantly from stages II to V (p<0.05), but the amino acid composition was relatively stable. The contents of total essential amino acids accounted for 39.65~40.93% of total amino acids, the ratios of total essential amino acids to total non-essential amino acids were in the range of 59.07~60.35%, and the amino acid scores were all higher than 100, indicating that meat of Yangtze River-Coilia can serve as a good source of amino acids. At different stages of ovarian development, the K content was the highest, followed by Na and Ca. Among the microelements tested, Cu and Mn levels were significantly decreased from stages II to V (p<0.05).
