[Objectives]The effect and mechanism of grape seed and sweet wormwood extract on growth of Monopterus albus were studied.[Methods]1 500 healthy M.albus with average mass of 23.8 g/tail were randomly divided into 5 gro...[Objectives]The effect and mechanism of grape seed and sweet wormwood extract on growth of Monopterus albus were studied.[Methods]1 500 healthy M.albus with average mass of 23.8 g/tail were randomly divided into 5 groups.The control group was fed with basal diet and the experimental groups were fed with 10,20,30 and 40 g/kg of grape seed and sweet wormwood extract,respectively.The growth performance of the fish was measured after 60 d of feeding at 23-28℃.[Results]The addition of grape seed and sweet wormwood extract in basal diet could increase the body weight gain rate,specific growth rate and protein efficiency,and decrease the feed coefficient.The activity of digestive enzymes,glutamic-oxaloacetic transaminase,glutamic-pyruvic transaminase,blood alkaline phosphatase and serum total protein was increased,and the contents of blood glucose and triglyceride were decreased.Compared with the control group,the above indexes showed significant difference(P<0.05)when the dosage was 20 and 30 g/kg(P<0.05).The difference was not significant(P>0.05)when the dosage was 10 and 40 g/kg(P>0.05).[Conclusions]As a feed additive,the plant extract from grape seed and sweet wormwood could increase digestive enzyme activity and regulate blood biochemical parameters of fish body.It had the function of promoting the digestion and absorption,enhancing the metabolic activity of 3 main nutrients,and hastening the growth of fish.展开更多
The losses caused by outbreaks of various diseases in aquaculture intensive farming are becoming more and more serious. Fish diseases have become one of the problems that constrain the healthy development of aquacultu...The losses caused by outbreaks of various diseases in aquaculture intensive farming are becoming more and more serious. Fish diseases have become one of the problems that constrain the healthy development of aquaculture. Among them,fish parasitic diseases have also caused some losses to the aquaculture industry. In this paper,17 species of fish parasites in Huaihua area,belonging to 15 genera in 13 families of 13 orders,are reviewed. In particular,the 10 kinds of fish parasitic diseases that are more harmful to farmed fishes are described in detail in order to provide a basis for the prevention of fish diseases in the future.展开更多
The Newcastle disease is an acute infectious disease,which spreads rapidly and causes serious damage to the chicken industry.In recent years,due to various reasons,atypical,chronic Newcastle disease has appeared in se...The Newcastle disease is an acute infectious disease,which spreads rapidly and causes serious damage to the chicken industry.In recent years,due to various reasons,atypical,chronic Newcastle disease has appeared in several chicken farms,especially in the process of stocking in mountain forests.In this paper,the author analyzed the causes of atypical Newcastle disease occurred in mountain forest stocking chickens from a farm in Zhongfang County,Huaihua City,and proposed some control measures.展开更多
基金Supported by Hunan Science and Technology Department Planning Project(2012NK3056)
文摘[Objectives]The effect and mechanism of grape seed and sweet wormwood extract on growth of Monopterus albus were studied.[Methods]1 500 healthy M.albus with average mass of 23.8 g/tail were randomly divided into 5 groups.The control group was fed with basal diet and the experimental groups were fed with 10,20,30 and 40 g/kg of grape seed and sweet wormwood extract,respectively.The growth performance of the fish was measured after 60 d of feeding at 23-28℃.[Results]The addition of grape seed and sweet wormwood extract in basal diet could increase the body weight gain rate,specific growth rate and protein efficiency,and decrease the feed coefficient.The activity of digestive enzymes,glutamic-oxaloacetic transaminase,glutamic-pyruvic transaminase,blood alkaline phosphatase and serum total protein was increased,and the contents of blood glucose and triglyceride were decreased.Compared with the control group,the above indexes showed significant difference(P<0.05)when the dosage was 20 and 30 g/kg(P<0.05).The difference was not significant(P>0.05)when the dosage was 10 and 40 g/kg(P>0.05).[Conclusions]As a feed additive,the plant extract from grape seed and sweet wormwood could increase digestive enzyme activity and regulate blood biochemical parameters of fish body.It had the function of promoting the digestion and absorption,enhancing the metabolic activity of 3 main nutrients,and hastening the growth of fish.
文摘The losses caused by outbreaks of various diseases in aquaculture intensive farming are becoming more and more serious. Fish diseases have become one of the problems that constrain the healthy development of aquaculture. Among them,fish parasitic diseases have also caused some losses to the aquaculture industry. In this paper,17 species of fish parasites in Huaihua area,belonging to 15 genera in 13 families of 13 orders,are reviewed. In particular,the 10 kinds of fish parasitic diseases that are more harmful to farmed fishes are described in detail in order to provide a basis for the prevention of fish diseases in the future.
文摘The Newcastle disease is an acute infectious disease,which spreads rapidly and causes serious damage to the chicken industry.In recent years,due to various reasons,atypical,chronic Newcastle disease has appeared in several chicken farms,especially in the process of stocking in mountain forests.In this paper,the author analyzed the causes of atypical Newcastle disease occurred in mountain forest stocking chickens from a farm in Zhongfang County,Huaihua City,and proposed some control measures.
