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Articles by X.J. Wang
Total Records ( 4 ) for X.J. Wang
  L.D. XIAO , K.S. MAI , Q.H. AI , W. XU , X.J. WANG , W.B. ZHANG and Z.G. LIUFU
  A 10-week feeding trial was conducted to determine the optimal requirement of cobia (Rachycentron canadum Linneaus) for dietary ascorbic acid (AA). Graded levels of L-ascorbyl-2-polyphosphate (LAPP) were supplemented in basal diet to formulate six semi-purified diets containing 2.70 (the control diet), 8.47, 28.3, 80.6, 241 and 733 mg AA equivalent kg−1 diet, respectively. Each diet was randomly fed to triplicate groups of fish in flow-through plastic tanks (300 L), and each tank was stocked with 25 fish with average initial weight of 4.59 ± 0.36 g. Observed deficiency signs included poor growth, higher mortality and lower feeding rate (FR) in the fish of the control group. Fish fed the control diet had significantly lower weight gain (WG), lower feed efficiency ratio (FER) and lower tissue AA concentrations in fish liver and muscle. With the increase of dietary AA, the survival, WG, FER, hepatic and muscular AA concentrations of cobia significantly increased and then levelled off. The dietary AA requirement of cobia was estimated to be 44.7 mg kg−1 based on WG, 53.9 mg kg−1 or 104 mg kg−1 based on either hepatic or muscular AA concentration, respectively.
  X.R. Wang , Y. Liu , L.P. Zhang , X.J. Wang and J.P. Wu
  The epidural retia mirabile is an arterial network formed by many of anastomotic branches from adjacent arteries for supplying blood to the brain in artiodactyla and plays a vital role in regulating cerebral blood flow. The purpose of this work was to compare anatomical differences of the epidural retia mirabile between the yak and cattle and to analyse their blood supply characteristics and provide a morphological basis for further research on the plateau adaptability of the yak. The vascular casts of the epidural retia mirabile were yielded on head specimens of 12 yaks (obtained from Qinghai China) and 10 cattle (obtained in Gansu China) by the corrosion casting technique. Their morphological features and arterial diameters were compared and analyzed using the methods of comparative anatomy. The general arrangements of the epidural retia mirabile in the yak were similar to that seen in cattle and mainly composed of the anterior portion, posterior portion, basi-occipital arterial plexus and anterior V-shaped extension. Middle width of the anterior epidural retia mirabile was more extensive and the posterior joint section was more developed and there were more abundant anterior anastomotic branches and communicating rami in the epidural retia mirabile of the yak. Moreover, the distribution ratios of blood flow from the maxillary artery entering the anterior epidural retia mirabile were 33.12% and 30.42% in the yak and in cattle, respectively. Our results indicated that the yak has more developed epidural retia mirabile. Its anatomical peculiarity perhaps is an adaptive characteristic of supplying blood system to the brain and which would help to buffer and regulate cerebral blood flow better so as to meet the cerebral oxygen demand of the yak in plateau areas.
  X.D. Mu , Y.C. Hu , X.J. Wang , H.M. Song , Y.X. Yang and J.R. Luo
  The Asian arowana, Scleropages formosus (Osteoglossidae) is one of the most valuable species of the ornamental fish which has an important role on academic study and economic development. The present study assessed the genetic variation of three S. formosus stocks cultured in ponds using 39 polymorphic microsatellite primer combinations. The results showed the middle level of genetic diversity among all three stocks. The average values of observed Heterozygosity (Ho) expected Heterozygosity (He) for the red stocks are the highest which were 0.509 and 0.552, respectively. Genetic diversity of the green stocks was higher than the golden group. The inbreeding coeffcients within the subpopulation (Fis) and the differentiation index of population (Fst) analyses showed low genetic differentiation among three cultured stocks. The cluster analysis based on Nei’s standard genetic distance showed that the golden and the green stocks clustered together and the red stock was in another clade. These results would have important implications for future breeding programs, conservation and production, suitable management guideline projects for S. formosus in mainland China.
  A.J. Turkson and X.J. Wang
  Problem statement: This study focused on statistical analysis of risk factors of the major disease among residents of STMA. The objectives of the study were to find the predominant diseases affecting residents in the catchments area. The study was also meant to identify risk factors associated with the incidence of the predominant disease. Approach: Purposive sampling technique was used to select residents from the target population. A structured questionnaire was used to obtain information from the sampling units. The data was analyzed using measures of risk, principal component analysis and chi-square tests. Results: Malaria (68%) topped the list of predominant diseases. It was also found that (44%) of those who had been diagnosed of malaria disease lived around swampy areas. The absolute risk value (78%) suggested that people living around the swampy area were at risk of infection by malaria parasites. The absolute risk value of 62% for dwellers of non-swampy areas indicated that aside the environmental factors there are other factors which were associated with the incidence of malaria. The principal component analysis results showed that; diets, social and educational status affect the incidence of malaria. The p-value of the chi-square test on two risk factors (environment and ones family history) were also significant, indicating that there was an association between the incidence of malaria in the catchments area and the identified risk factors. This result confirmed earlier researches that sought to investigate the relationship between diseases and environmental factors. Conclusion/Recommendations: It was revealed that apart from environmental factors and family history; diets, social status and educational background play an important role in the health of the residents. It was recommended that STMA takes the appropriate measures to prevent 6 people from the risk factor at any case.
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