摘要
An 8-week feeding trial was conducted to investigate the effects of dietary soy isoflavones on feeding intake,growth performance,and digestion of juvenile Japanese flounder(Paralichthys olivaceus).Four isonitrogenous(49% crude protein) and isoenergetic(20.1 MJ kg-1) diets were formulated to contain four graded levels of soy isoflavones,namely,0,1,4 and 8 g soy isoflavones in 1 kg of diet.Each diet was randomly fed to triplicate tanks of fish(Initial average weight:2.58 g ± 0.01 g),and each tank was stocked with 35 fish.No significant difference was observed among diets with levels of 0,1 and 4 g kg-1 soy isoflavones in feed intake,weight gain,feed efficiency ratio(FER),proximate composition of fish whole body and apparent digestibility coefficients(ADC) of nutrients and energy(P>0.05).However,high dietary soy isoflavones level(8 g kg-1) significantly depressed weight gain,FER,whole-body crude lipid content of fish and ADC of nutrients(P<0.05).These results indicate that high level of dietary soy isoflavones(above 4 g kg-1) significantly depresses growth responses and FER of Japanese flounder.However,as the content of soy isoflavones in soybean meal is around 1 to 3 g kg-1,the adverse effects might be neglected when soybean products are used as a fish feed ingredient.
An 8-week feeding trial was conducted to investigate the effects of dietary soy isoflavones on feeding intake, growth performance, and digestion of juvenile Japanese flounder （Paralichthys olivaceus）. Four isonitrogenous （49% crude protein） and isoenergetic （20.1 MJkg1-） diets were formulated to contain four graded levels of soy isoflavones, namely, 0, 1, 4 and 8 g soy isofla- vones in 1 kg of diet. Each diet was randomly fed to triplicate tanks of fish （Initial average weight： 2.58 g± 0.01 g）, and each tank was stocked with 35 fish. No significant difference was observed among diets with levels of 0, 1 and 4gkg-1 soy isoflavones in feed in- take, weight gain, feed efficiency ratio （FER）, proximate composition of fish whole body and apparent digestibility coefficients （ADC） of nutrients and energy （P〉0.05）. However, high dietary soy isoflavones level （8 g kg-1） significantly depressed weight gain, FER, whole-body crude lipid content of fish and ADC of nutrients （P〈0.05）. These results indicate that high level of dietary soy isoflavones （above 4 g kg-1） significantly depresses growth responses and FER of Japanese flounder. However, as the content of soy isoflavones in soybean meal is around 1 to 3 gkg-1, the adverse effects might be neglected when soybean products are used as a fish feed ingredient.
基金
supported by the National Natural Science Foundation of China (No. 30371120)
Modern Agro-industry Technology Research System (No. nycytx50-G07)
