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Articles by W. Chen
Total Records ( 6 ) for W. Chen
  Z. DING , Y. XU , H. ZHANG , S. WANG , W. CHEN and Z. SUN
  An experiment was conducted in the laboratory to investigate the effects of additive ratios of docosahexaenoic acid (DHA) to eicosapentaenoic acid (EPA) on the growth and survival of cobia (Rachycentron canadum) juveniles from August to October 2005. Three hundred and eighty cobia juveniles (56 days of age, body weight 6.9 ± 0.1 g, body length 9.2 ± 0.1 cm) were selected and 20 of them were freely taken for initial sample analysis in the week 0. Additional 360 juveniles were randomly assigned into eight groups with triplicate, total 24 tanks with 15 fish each. Cobia juveniles were reared in glass-steel tanks (200-L volume per tank) using filtered seawater with temperature 26–30.5 °C, salinity 25.4–33.0 g L−1 and pH 7.8–8.0. Cobia juveniles were fed for 8 weeks using seven treatment diets (D-1 to D-7) with the same amount of DHA and EPA (15.0 ± 1.2 g kg−1 of dried diet), but varying ratios of DHA to EPA (0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, respectively) and a control diet (D-0, DHA + EPA = 8.0 g kg−1 of dried diet, DHA/EPA = 1.3). Five juveniles per tank were randomly taken for sample analysis at the end of weeks 4 and 8, respectively. The highest protein efficiency rate (PER; 1.5 in mean), average body weight (BW; 73.3 g per fish in mean) and the lowest feed conversion ratio (FCR; 1.6 in mean) were obtained in cobia juveniles fed the control diet at the end of week 8. These parameters were significantly different (P < 0.05) among juveniles fed the control and treatment diets; however, no significant difference (P > 0.05) was found among juveniles fed the treatment diets evaluated in this study. It was concluded that the survival and growth of cobia juveniles were not greatly influenced by additive ratios of DHA to EPA in our experimental conditions.
  A.M. Fouad , Y. Li , W. Chen , D. Ruan , S. Wang , W. Xie , Y.C. Lin and C.T. Zheng
  Objective: Manganese (Mn) is a crucial trace element for poultry nutrition because it has multiple physiological functions. Thus, the main goal of this study was to evaluate the effects of dietary Mn supplementation on laying performance, egg quality and antioxidant status in Shanma laying ducks. Methodology: Five hundred and four Shanma laying ducks, at 17 weeks of age, were randomly assigned to 7 treatments, with 6 replicates per treatment and 12 ducks per replicate. Birds were fed the same basal diet, which was supplemented with 0.0 (control), 15, 30, 45, 60, 75 or 90 mg Mn/kg in the form of Mn-sulfate. Results: Results showed that dietary Mn supplementation did not affect egg production, egg weight, feed conversion ratio, egg mass, egg quality, tibia characteristics, total antioxidant capacity, copper-zinc superoxide dismutase or lipid peroxidation (malondialdehyde), but supplementing 90 mg Mn/kg diet significantly (p<0.05) improved the activities of total superoxide dismutase, Mn-containing superoxide dismutase and increased Mn content in egg yolk compared with the control group. Conclusion: These results indicate that corn-soybean meal diet containing sufficient amount of Mn for laying performance and egg quality in Shanma laying ducks under the conditions of current experiment, but adding 90 mg Mn/kg basal diet is required to improve the activities of Mn-containing superoxide dismutase and total superoxide dismutase and elevate Mn content in their egg yolk.
  A. Cheikhyoussef , N. Pogori , F.W. Tian , W. Chen and H. Zhang
  ┬áThe antimicrobial activity of four strains of Bifidobacterium toward Salmonella ssp. during associated cultures growth was investigated in skim milk medium. All strains showed different degrees of antagonistic action toward the indicator strain. The highest degree of inhibition (96%) was obtained with Bifidobacterium infantis and Bifidobacterium longum (92%). The combination effect of yogurt mixed culture with bifidobacterial strains (di-associated culture) toward Salmonella ssp. resulted in an enhancement of the antagonistic action for Bifidobacterium strains as a result of their production of organic acids, in particular lactic acid, which has a strong inhibitory effect against Gram-negative bacteria. The di-associated cultures all resulted in similar pH values but the degree of inhibition were different with B. infantis and B. longum; meaning that organic acids are not the sole inhibitory factors present in these cultures, but it could be another compounds which may contribute in this inhibitory effects. The combination between Bifidobacterium and YMC strains could has a great value in industrial application in resolving some problems in dairy products and pharmaceutical formulas.
  A.M. Fouad , W. Chen , D. Ruan , S. Wang , W.G. Xia and C.T. Zheng
  Modern strains of poultry have been produced to meet the demands of consumers in terms of quantity and they are affected by problems associated with immunity (sensitivity to infection with different diseases), stressors (high sensitivity to different stressors) and product quality (meat and egg quality). In particular, heat stress (HS) negatively affects the productive performance, meat yield, egg yield, meat quality (visual appearance and chemical characteristics), egg quality (internal and external), reproductive performance, intestinal functions and immune response. In addition, there is increased awareness among consumers of the quality of food and the industry must aim to satisfy the higher requirements of consumers. Thus, there is increased pressure on poultry producers to improve their production quantity and quality. As a consequence, it is important to know how HS affects the meat quality, egg quality, immune organs, intestinal functions and reproductive organs in order to protect against any negative effects. In addition, it is essential to determine the roles of nutritional factors and the possibility of using them to overcome the negative effects of HS. This review summarizes current research in these areas.
  J.L. Gao , X.X. Huang , H.T. Song , W. Chen and N.H. Quan
  To realize the high-speed, realtime and high-reliability communication between the controller and the servo motors, the high-speed communication system is developed. It is based on Sercos II (serial real time communication specification II). One modeling scheme fitting for the communication system based on Object-Oriented Technology (OOT) and Unified Modeling Language (UML) is presented. It gives in-depth discussion about modeling the system based on UML, designing of the software and hardware of Sercos II master/slave station, real-time performance calculation and consistency verification. Eventually, the system is applied in 3-axis numerical control machine tool. It can send the control instructions with 4 bytes to 1-6 servo motion axles and receive the feedback parameters with 4bytes within control cycle of 0.5 m sec.
  A.M. Fouad , Y. Li , W. Chen , D. Ruan , S. Wang , W.G. Xie , Y.C. Lin and C.T. Zheng
  This study was designed to investigate the influences of dietary copper (Cu) on laying performance, egg quality, plasma total cholesterol (TC), high-density lipoprotein cholesterol (HDLC) and low density lipoprotein-cholesterol (LDLC) concentrations in Shanma laying ducks. A total of 504 egg laying ducks aged 17 week were randomly allotted to seven groups (twelve ducks per replicate and six replicates each treatment). The control group was fed a corn-soybean meal diet, whereas the treatment groups were fed corn-soybean meal diets supplemented with 4, 8, 12, 16, 20, or 24 mg Cu-sulfate/kg. Egg production, egg weight, egg mass, feed conversion ratio, broken egg rate, abnormal egg rate, Haugh unit, yolk color, albumen height, eggshell weight, eggshell percent, eggshell breaking strength, eggshell thickness, plasma TC, HDLC and LDLC concentrations did not appear response to dietary Cu levels. Our results indicated that corn-soybean meal diet containing sufficient amount of Cu for laying performance and egg quality in laying ducks under the conditions of current experiment. Also, laying performance, plasma TC, HDLC, LDLC concentrations and egg quality were not sensitive traits to low levels of Cu.
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