Analysis and evaluation of the nutrient composition of the muscle of hybrid F1 of female Cromileptes altivelis×male Epinephelus lanceolatus and its parent fish
Through analyzing and evaluating the muscle nutrient composition of the hybrid fish"Hualong Grouper"and its parent camelback grouper(Cromileptes altivelis ♀)and giant grouper(Epinephelus lanceolatus ♂),basic data and information are provided for the breeding of new varieties of groupers and the development of formulated feeds.The biochemical assay methods were used to determine and evaluate the water content,protein,crude fat,ash content,as well as the composition and content of amino acids,fatty acids,and eight mineral elements in the muscle of three species of groupers.The results showed that the crude protein content of"Hualong Grouper"was significantly higher than that of the Humpback Grouper and the Giant Grouper(P＜0.05);the crude fat content was higher than that of the Humpback Grouper and the Giant Grouper,and significantly different from the parent Giant Grouper(P＜0.05);the content of methionine and glycine in"Hualong Grouper"was higher than that of the parent species,and its glycine content was significantly different from the parent species(P＜0.05).The total amino acid content(18.42%),essential amino acid content(7.00%),non-essential amino acid content(11.42%),and umami amino acid content(7.60%)of"Hualong Grouper"were significantly lower than those of the mother species(P＜0.05);except for the total amino acid content,the other amino acid contents of"Hualong Grouper"were significantly higher than those of its father(P＜0.05);the essential amino acid index(EAAI)was in the order of Humpback Grouper(83.74)＞Giant Grouper(81.21)＞"Hualong Grouper"(75.21),and the difference was significant(P＜0.05);the DAA/TAA ratio(0.41)was higher than the parent species;the content of monounsaturated fatty acids(MUFA)was in the order of"Hualong Grouper"(26.60%)＞Humpback Grouper(26.51%)＞Giant Grouper(23.01%);the n-3 polyunsaturated fatty acid content of"Hualong Grouper"was lower than that of the parent species,while the n-6 polyunsaturated fatty acid content was higher than that of the parent species,and the n-3/n-6 ratio was also lower than that of the parent species.The potassium(K),magnesium(Mg),and phosphorus(P)content of"Hualong Grouper"was relatively high,while the zinc(Zn)content was significantly lower than that of the parent species(P＜0.05),and the sodium(Na)content was significantly higher than that of the Giant Grouper(P＜0.05).In summary,the muscle nutrient of the hybrid fish"Hualong Grouper"inherited and integrated the excellent traits of its parents,the muscle nutrient composition was relatively balanced,and it met the FAO/WHO standards,making it a high-quality protein source that meets people's nutritional needs.
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