This experiment was conducted to investigate the effects of dietary arginine levels on growth performance, body composition, serum biochemical indices and resistance ability against ammonia-nitrogen stress in juvenile...This experiment was conducted to investigate the effects of dietary arginine levels on growth performance, body composition, serum biochemical indices and resistance ability against ammonia-nitrogen stress in juvenile yellow catfish(Pelteobagrus fulvidraco). Five isonitrogenous and isolipidic diets(42%protein and 9% lipid) were formulated to contain graded levels of arginine(2.44%, 2.64%, 2.81%, 3.01% and3.23% of diet), by supplementing L-Arginine HCI. Seven hundred juvenile yellow catfish with an initial average body weight of 1.13 ± 0.02 g were randomly divided into 5 groups with 4 replicates of 35 fish each and each group was fed one of the diets. After 56 d feeding, fish were exposed to 100 mg/L of ammonia-nitrogen for 72 h. The results showed that weight gain(WG) and specific growth rate(SGR) in2.64% and 2.81% groups were significantly higher than those in 3.23% group(P < 0.05). The feed conversation ratio(FCR) in 2,64%, 2,81% and 3.01% groups was significantly decreased when compared with3,23% group. The protein efficiency ratio(PER) in 2.64% group was significantly higher than that in 2.44%and 3.23% groups(P < 0.05). The condition factor(CF) of fish was significantly higher in 2.81% group than that in 2,44% group(P < 0.05). Dietary arginine levels had no significant effect on hepatosomatic index(HSI), viscerosomatic index(VSI), and whole-body dry matter, crude protein, crude lipid, ash contents, as well as serum total protein(TP), triglyceride(TG), glucose(GLU), urea nitrogen(UN) contents and aspartate aminotransferase(AST), alanine aminotransferase(ALT) activities(P> 0.05). After the fish were challenged to ammonia-nitrogen for 72 h, their cumulative mortality rate in 2.81% group was significantly lower than that in 2.44% group(P < 0.05). The results suggested that dietary arginine level at 2.81%could optimize anti-ammonia-nitrogen stress ability of juvenile yellow catfish and a level of 3.23%arginine seemed to depress the growth performance of fish and decreased their tolerance to the ammonia-nitrogen stress under current study. A quadratic regression analysis based on WG indicated that the optimal dietary arginine requirement of juvenile yellow catfish was estimated to be 2.74% of the diet(6.45% of dietary protein) under current culture conditions.展开更多
In order to provide reference for using Siganus guttatus to control overgrowth of Enteromorpha prolifra,the growth,serum biochemical and antioxidant enzyme indices of juvenile S.guttatus respectively fed with E.prolif...In order to provide reference for using Siganus guttatus to control overgrowth of Enteromorpha prolifra,the growth,serum biochemical and antioxidant enzyme indices of juvenile S.guttatus respectively fed with E.prolifra and artificial feed were studied.One hundred and eighty individuals were cultivated for 90 days in six 2.5 m × 1.5 m × 1.5 m cages (30 ind.per cage) which mesh size were 0.5 mm.The experimental animals were divided into two dietary groups (three cages for each group) that were fed with E.prolifra and artificial feed respectively.During the culture period,temperatures ranged from 23.0 to 26.5℃,p H was between 7.8 and 8.2,dissolved oxygen was more than 5.0 mg/L.The weight gain rate,specific growth rate,relative growth rate,hepato-somatic index of juvenile S.guttatus fed with E.prolifra were significantly lowe than that fed with artificial feed (P<0.05).The total protein (TP),urea nitrogen (UN)and alkaline phosphatase (AKP) of juvenile S.guttatus fed with E.Prolifra were significantly higher than that fed with artificial feed (P<0.05),while glutamic oxalacetic transaminase (AST/GOT) and glutamic-pyruvic transaminase (ALT/GPT) of juvenile S.guttatus fed with E.prolifra were significantly lower than that fed with artificial feed (P<0.05).SOD,GPX and anti-superoxide anion radical activity in liver,kidney,gill and muscle of juvenile S.guttatus fed with E.prolifra were higher than that fed with artificial feed,and these antioxidant enzyme activities in kidney of juvenile S.guttatus fed with E.prolifra was significantly higher than that fed with artificial feed (P<0.05),while CAT and hydroxyl radical-inhibiting activity in liver of juvenile S.guttatus fed with artificial feed were significantly higher than that fed with E.prolifra (P<0.05).Juvenile S.guttatus fed with E.prolifra showed poor growth performance but better antioxidant defense system.S.guttatus is easily raised and has stronger ability of digestion and absorption of E.Prolifra.The technique that uses S.guttatus to control E.prolifra deserves deeply study.展开更多
Objective To examine the utility of the Nutrition Risk Screening 2002(NRS 2002),Patient-Generated Subjective Global Assessment(PG-SGA)and serum factors for the preoperative evaluation of gastric cancer patients.Method...Objective To examine the utility of the Nutrition Risk Screening 2002(NRS 2002),Patient-Generated Subjective Global Assessment(PG-SGA)and serum factors for the preoperative evaluation of gastric cancer patients.Methods We examined 181 gastric cancer patients treated at the First Affiliated Hospital of Guangxi Medical University from January 2015 to January 2018.Nutritional assessments were administered within 48 h of admission.The body mass index(BMI)and serum factors were measured,and information on preoperative nutritional support and postoperative complications was recorded.Results Both the NRS 2002 and PG-SGA had positive correlations with age(P<0.05),and negative correlations with albumin,prealbumin,transferrin,hemoglobin,BMI,and bodyweight(P<0.05).The NRS 2002 and PG-SGA scores were positively correlated with each other(r=0.683,P<0.01),but had poor consistency(κ=0.357,P<0.01).During the preoperative period,33.2%of patients received nutritional support,mainly enteral nutrition.The nutritional risk group(NRS 2002≥3)received more support than the group without nutritional risk(NRS 2002<3;P<0.05).Patients with nutritional risk or malnutrition who received preoperative nutritional support had fewer postoperative complications than unsupported patients.The overall rate of complications was 12.2%,and the rate of severe complications(gradeⅢor above)was 5.5%.The malnutrition and nutritional risk groups had higher rates of severe complications.Conclusions The combined application of the NRS 2002,PG-SGA,BMI,and serum nutritional indices was useful for the nutritional screening and assessment of preoperative gastric cancer patients.The NRS 2002 and PG-SGA provided guidance on the need for nutritional support during the preoperative period.展开更多
The objective of the present study was to investigate the effects of methionine(Met) supplementation on growth performance of cubs, nutrient digestibility, nitrogen metabolism and serum biochemical parameters of femal...The objective of the present study was to investigate the effects of methionine(Met) supplementation on growth performance of cubs, nutrient digestibility, nitrogen metabolism and serum biochemical parameters of female blue foxes. One hundred primiparous female blue foxes that were similar in breeding date, pedigree, age, and weight were selected for the trial. The foxes were randomly assigned to four groups(n = 25 each group) and fed diets supplemented with Met at 2(Met2), 4(Met4), 6(Met6)and 8 g/kg(Met8), respectively, for 40 days. Our data showed that body weights at 20 and 40 d were significantly higher in the Met4 group than in the Met2 group(P < 0.05). The Met4 group also had the highest apparent digestibility of dry matter and crude protein compared with either the Met2, Met6, or Met8 group(P< 0.05). The serum Met and isoleucine(Ile) concentrations were significantly higher in the Met4 group than in the Met6 or Met8 group(P < 0.05). In summary, these data indicate that supplementary Met improves growth performance of cubs likely due to increased crude protein and dry matter and increased nitrogen retention of female blue foxes. The optimal amount of Met supplementation is10 g/kg basal diet.展开更多
基金supported by the National Natural Science Foundation of China (31402307)the construction of public service platform for the evaluation of the value of aquatic feed and feed additives in Guangdong Province(2015A040404033)
文摘This experiment was conducted to investigate the effects of dietary arginine levels on growth performance, body composition, serum biochemical indices and resistance ability against ammonia-nitrogen stress in juvenile yellow catfish(Pelteobagrus fulvidraco). Five isonitrogenous and isolipidic diets(42%protein and 9% lipid) were formulated to contain graded levels of arginine(2.44%, 2.64%, 2.81%, 3.01% and3.23% of diet), by supplementing L-Arginine HCI. Seven hundred juvenile yellow catfish with an initial average body weight of 1.13 ± 0.02 g were randomly divided into 5 groups with 4 replicates of 35 fish each and each group was fed one of the diets. After 56 d feeding, fish were exposed to 100 mg/L of ammonia-nitrogen for 72 h. The results showed that weight gain(WG) and specific growth rate(SGR) in2.64% and 2.81% groups were significantly higher than those in 3.23% group(P < 0.05). The feed conversation ratio(FCR) in 2,64%, 2,81% and 3.01% groups was significantly decreased when compared with3,23% group. The protein efficiency ratio(PER) in 2.64% group was significantly higher than that in 2.44%and 3.23% groups(P < 0.05). The condition factor(CF) of fish was significantly higher in 2.81% group than that in 2,44% group(P < 0.05). Dietary arginine levels had no significant effect on hepatosomatic index(HSI), viscerosomatic index(VSI), and whole-body dry matter, crude protein, crude lipid, ash contents, as well as serum total protein(TP), triglyceride(TG), glucose(GLU), urea nitrogen(UN) contents and aspartate aminotransferase(AST), alanine aminotransferase(ALT) activities(P> 0.05). After the fish were challenged to ammonia-nitrogen for 72 h, their cumulative mortality rate in 2.81% group was significantly lower than that in 2.44% group(P < 0.05). The results suggested that dietary arginine level at 2.81%could optimize anti-ammonia-nitrogen stress ability of juvenile yellow catfish and a level of 3.23%arginine seemed to depress the growth performance of fish and decreased their tolerance to the ammonia-nitrogen stress under current study. A quadratic regression analysis based on WG indicated that the optimal dietary arginine requirement of juvenile yellow catfish was estimated to be 2.74% of the diet(6.45% of dietary protein) under current culture conditions.
文摘In order to provide reference for using Siganus guttatus to control overgrowth of Enteromorpha prolifra,the growth,serum biochemical and antioxidant enzyme indices of juvenile S.guttatus respectively fed with E.prolifra and artificial feed were studied.One hundred and eighty individuals were cultivated for 90 days in six 2.5 m × 1.5 m × 1.5 m cages (30 ind.per cage) which mesh size were 0.5 mm.The experimental animals were divided into two dietary groups (three cages for each group) that were fed with E.prolifra and artificial feed respectively.During the culture period,temperatures ranged from 23.0 to 26.5℃,p H was between 7.8 and 8.2,dissolved oxygen was more than 5.0 mg/L.The weight gain rate,specific growth rate,relative growth rate,hepato-somatic index of juvenile S.guttatus fed with E.prolifra were significantly lowe than that fed with artificial feed (P<0.05).The total protein (TP),urea nitrogen (UN)and alkaline phosphatase (AKP) of juvenile S.guttatus fed with E.Prolifra were significantly higher than that fed with artificial feed (P<0.05),while glutamic oxalacetic transaminase (AST/GOT) and glutamic-pyruvic transaminase (ALT/GPT) of juvenile S.guttatus fed with E.prolifra were significantly lower than that fed with artificial feed (P<0.05).SOD,GPX and anti-superoxide anion radical activity in liver,kidney,gill and muscle of juvenile S.guttatus fed with E.prolifra were higher than that fed with artificial feed,and these antioxidant enzyme activities in kidney of juvenile S.guttatus fed with E.prolifra was significantly higher than that fed with artificial feed (P<0.05),while CAT and hydroxyl radical-inhibiting activity in liver of juvenile S.guttatus fed with artificial feed were significantly higher than that fed with E.prolifra (P<0.05).Juvenile S.guttatus fed with E.prolifra showed poor growth performance but better antioxidant defense system.S.guttatus is easily raised and has stronger ability of digestion and absorption of E.Prolifra.The technique that uses S.guttatus to control E.prolifra deserves deeply study.
基金This work was supported by a Medical and Health Suitable Technology Development and Extension Project of Guangxi Province:The combined application of the evaluation and screening of nutritional risk and serum biochemical indexes for nutritional therapy of gastric cancer patients in perioperative period(No.S2017018).
文摘Objective To examine the utility of the Nutrition Risk Screening 2002(NRS 2002),Patient-Generated Subjective Global Assessment(PG-SGA)and serum factors for the preoperative evaluation of gastric cancer patients.Methods We examined 181 gastric cancer patients treated at the First Affiliated Hospital of Guangxi Medical University from January 2015 to January 2018.Nutritional assessments were administered within 48 h of admission.The body mass index(BMI)and serum factors were measured,and information on preoperative nutritional support and postoperative complications was recorded.Results Both the NRS 2002 and PG-SGA had positive correlations with age(P<0.05),and negative correlations with albumin,prealbumin,transferrin,hemoglobin,BMI,and bodyweight(P<0.05).The NRS 2002 and PG-SGA scores were positively correlated with each other(r=0.683,P<0.01),but had poor consistency(κ=0.357,P<0.01).During the preoperative period,33.2%of patients received nutritional support,mainly enteral nutrition.The nutritional risk group(NRS 2002≥3)received more support than the group without nutritional risk(NRS 2002<3;P<0.05).Patients with nutritional risk or malnutrition who received preoperative nutritional support had fewer postoperative complications than unsupported patients.The overall rate of complications was 12.2%,and the rate of severe complications(gradeⅢor above)was 5.5%.The malnutrition and nutritional risk groups had higher rates of severe complications.Conclusions The combined application of the NRS 2002,PG-SGA,BMI,and serum nutritional indices was useful for the nutritional screening and assessment of preoperative gastric cancer patients.The NRS 2002 and PG-SGA provided guidance on the need for nutritional support during the preoperative period.
文摘The objective of the present study was to investigate the effects of methionine(Met) supplementation on growth performance of cubs, nutrient digestibility, nitrogen metabolism and serum biochemical parameters of female blue foxes. One hundred primiparous female blue foxes that were similar in breeding date, pedigree, age, and weight were selected for the trial. The foxes were randomly assigned to four groups(n = 25 each group) and fed diets supplemented with Met at 2(Met2), 4(Met4), 6(Met6)and 8 g/kg(Met8), respectively, for 40 days. Our data showed that body weights at 20 and 40 d were significantly higher in the Met4 group than in the Met2 group(P < 0.05). The Met4 group also had the highest apparent digestibility of dry matter and crude protein compared with either the Met2, Met6, or Met8 group(P< 0.05). The serum Met and isoleucine(Ile) concentrations were significantly higher in the Met4 group than in the Met6 or Met8 group(P < 0.05). In summary, these data indicate that supplementary Met improves growth performance of cubs likely due to increased crude protein and dry matter and increased nitrogen retention of female blue foxes. The optimal amount of Met supplementation is10 g/kg basal diet.
