An experiment was conducted to evaluate the effects of feeding various sources of dietary lipid on weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii...An experiment was conducted to evaluate the effects of feeding various sources of dietary lipid on weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii. Six semi-purified diets containing vitamin-free casein, defatted soybean meal, 0. 5% choline chloride, 0. 5% glycine and 0. 5% cholesterol were supplemented with 6. 0% of either anchovy oil, linseed oil, soybean oil, rapeseed oil, safflower oil or pork lard. Each diet was fed to crawfish (3. 07±0. 21 g average weight) in three replicate aquaria for 60 days. Survival rate, weight gain and feed conversion were best for crawfish fed the diet containing anchovy oil. Crawfish fed the linseed oil diet had the second highest weight gain, followed by crawfish on soybean oil, repaseed oil, safflower oil and pork lard diets, respectively. Feed conversion values were a reflection of weight gain. Results showed that both n-6 and n-3 fatty acids are dietary essential for juvenile Procambarus clarkii, although n-3 fatty acids promoted faster growth than n-6. However, highly unsaturated fatty acids (HUFA) (20 : 5n-3 and 22 :6n-3) had better growth-promoting effect than 18 : 3n-3, due probably to the limited ability of crawfish to bioconvert fatty acids to polyenoic forms of longer chain length. The fatty acid composition of the crawfish generally reflected that of the dietary lipids, especially for the diets containing unsaturated fatty acids.展开更多
Requirement for dietary n-3 HUFA (n-3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers and Artemia at various levels of n-3 HUFA. Five ...Requirement for dietary n-3 HUFA (n-3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers and Artemia at various levels of n-3 HUFA. Five treatments with rotifers and Artemia differing in n-3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n-3 HUFA significantly influence fish n-3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n-3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n-3 HUFA fatty acid ethyl esters from ethyl-esterified oil.展开更多
As the consumption of fructose and saturated fatty acids(FAs) has greatly increased in western diets and is linked with an increased risk of metabolic syndrome,the aim of this study was to investigate the effects of a...As the consumption of fructose and saturated fatty acids(FAs) has greatly increased in western diets and is linked with an increased risk of metabolic syndrome,the aim of this study was to investigate the effects of a mod-erate(10 weeks) and a prolonged(30 weeks) high fructose and saturated fatty acid(HFS) diet on plasma FA com-position in rats.The effects of a few weeks of HFS diet had already been described,but in this paper we tried to es-tablish whether these effects persist or if they are modified after 10 or 30 weeks.We hypothesized that the plasma FA profile would be altered between 10 and 30 weeks of the HFS diet.Rats fed with either the HFS or a standard diet were tested after 10 weeks and again after 30 weeks.After 10 weeks of feeding,HFS-fed rats developed the metabolic syndrome,as manifested by an increase in fasting insulinemia,total cholesterol and triglyceride levels,as well as by impaired glucose tolerance.Furthermore,the plasma FA profile of the HFS group showed higher proportions of monounsaturated FAs like palmitoleic acid [16:1(n-7)] and oleic acid [18:1(n-9)],whereas the proportions of some polyunsaturated n-6 FAs,such as linoleic acid [18:2(n-6)] and arachidonic acid [20:4(n-6)],were lower than those in the control group.After 30 weeks of the HFS diet,we observed changes mainly in the levels of 16:1(n-7)(decreased) and 20:4(n-6)(increased).Together,our results suggest that an HFS diet could lead to an adaptive response of the plasma FA profile over time,in association with the development of the metabolic syndrome.展开更多
基金supported by the Scientific Fund of Hubei Agricultural Collegea grant from the Ministry of Education in Hubei Province,P.R.China
文摘An experiment was conducted to evaluate the effects of feeding various sources of dietary lipid on weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii. Six semi-purified diets containing vitamin-free casein, defatted soybean meal, 0. 5% choline chloride, 0. 5% glycine and 0. 5% cholesterol were supplemented with 6. 0% of either anchovy oil, linseed oil, soybean oil, rapeseed oil, safflower oil or pork lard. Each diet was fed to crawfish (3. 07±0. 21 g average weight) in three replicate aquaria for 60 days. Survival rate, weight gain and feed conversion were best for crawfish fed the diet containing anchovy oil. Crawfish fed the linseed oil diet had the second highest weight gain, followed by crawfish on soybean oil, repaseed oil, safflower oil and pork lard diets, respectively. Feed conversion values were a reflection of weight gain. Results showed that both n-6 and n-3 fatty acids are dietary essential for juvenile Procambarus clarkii, although n-3 fatty acids promoted faster growth than n-6. However, highly unsaturated fatty acids (HUFA) (20 : 5n-3 and 22 :6n-3) had better growth-promoting effect than 18 : 3n-3, due probably to the limited ability of crawfish to bioconvert fatty acids to polyenoic forms of longer chain length. The fatty acid composition of the crawfish generally reflected that of the dietary lipids, especially for the diets containing unsaturated fatty acids.
文摘Requirement for dietary n-3 HUFA (n-3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers and Artemia at various levels of n-3 HUFA. Five treatments with rotifers and Artemia differing in n-3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n-3 HUFA significantly influence fish n-3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n-3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n-3 HUFA fatty acid ethyl esters from ethyl-esterified oil.
文摘As the consumption of fructose and saturated fatty acids(FAs) has greatly increased in western diets and is linked with an increased risk of metabolic syndrome,the aim of this study was to investigate the effects of a mod-erate(10 weeks) and a prolonged(30 weeks) high fructose and saturated fatty acid(HFS) diet on plasma FA com-position in rats.The effects of a few weeks of HFS diet had already been described,but in this paper we tried to es-tablish whether these effects persist or if they are modified after 10 or 30 weeks.We hypothesized that the plasma FA profile would be altered between 10 and 30 weeks of the HFS diet.Rats fed with either the HFS or a standard diet were tested after 10 weeks and again after 30 weeks.After 10 weeks of feeding,HFS-fed rats developed the metabolic syndrome,as manifested by an increase in fasting insulinemia,total cholesterol and triglyceride levels,as well as by impaired glucose tolerance.Furthermore,the plasma FA profile of the HFS group showed higher proportions of monounsaturated FAs like palmitoleic acid [16:1(n-7)] and oleic acid [18:1(n-9)],whereas the proportions of some polyunsaturated n-6 FAs,such as linoleic acid [18:2(n-6)] and arachidonic acid [20:4(n-6)],were lower than those in the control group.After 30 weeks of the HFS diet,we observed changes mainly in the levels of 16:1(n-7)(decreased) and 20:4(n-6)(increased).Together,our results suggest that an HFS diet could lead to an adaptive response of the plasma FA profile over time,in association with the development of the metabolic syndrome.
