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Articles by U.E. Ogundu
Total Records ( 3 ) for U.E. Ogundu
  E.U. Onweremadu , E.T. Eshett , U.E. Ogundu , C.P. Anyanwu and J.C. Obiefuna
  The study investigated influence of some soil properties on sorption and bioaccessibility of cationic chromium [Cr (III)] of rangeland soils proximal to military settlement at Obinze, Southeastern Nigeria in 2006. Field sampling was guided by a transect drawn from an open dump site away towards River Otamiri, Owerri, Southeastern Nigeria. Three land units, namely A, B and C from which soil samples were collected and analyzed using routine and special techniques. Soil and plant data were subjected to analysis of variance (ANOVA) of the Mix-model of SAS computer software and multiple regression analysis for purpose of modelling. Results showed that Cr sorption and biaccessibility varied among land units with the entire site having high potentials of bioavailability and biotoxicity. It was also found that clay-content, cation exchange capacity, soil pH and total inorganic carbon are good predictors of Cr (III) bioaccessibility in studied soil.
  I.P. Ogbuewu , U.E. Ogundu , M.N. Opara , I.C. Okoli , D.O. Umesiobi , U. Herbert and M.U. Iloeje
  The application of technologies in the field of male reproductive physiology has advanced greatly during past couple of decades. Since, the advent of frozen semen and artificial insemination, reproductive physiologists have attempted to manipulate male reproductive rates of mammals, sometimes successfully or sometimes not. The past five decades has resulted in phenomenal expansion in the improvement spermatozoa with direct application to livestock and medicine. Spermatogenesis had been reported to be induced in male animals using synthetic fertility drugs and local plant extracts. Sperm production and function have been improved via the use of nutritional regiments, semen extender and semen pool admixture. Currently, the sex of animal has been predetermined with 85-95% accuracy by sexing spermatozoa. The current success recorded in male assisted reproductive techniques came about due to advances in computer science, biophysics, cell biology and genetic engineering. This review will briefly cover the developments and modifications of existing sperm manipulation techniques that have direct practical applications today and in the near future in animal agriculture and bio-medicine.
  I.C. Okoli , D.A. Alaehie , E.C. Akano , U.E. Ogundu , C.G. Okoli , C.T. Akujobi , I.D. Onyicha and C.E. Chinweze
  Research on the concentrations of aerial pollutant gases in tropical livestock buildings is needed in order to establish baselines for exposure limits in context of animal and human welfare in the tropical environments. The concentrations of aerial ammonia, nitrous oxide, methane, carbon monoxide, hydrogen sulfide and sulfur dioxide in selected pig pens in the Owerri area of Imo State, Nigeria were measured during the month of August 2002. These were thereafter correlated with pig building measurements in order to determine the possible influence of building measurements on concentration of the gases. Overall mean aerial concentrations of carbon monoxide CO (2.7±0.34 ppm) was the highest mean value recorded and was followed by the 1.4±0.0 and 0.07±0.14 ppm recorded for flammable gas (methane) and hydrogen sulfide, respectively while the 0.0±0.0 ppm recorded for ammonia was lowest. The average length of the buildings was 64.20, while 21.40, 11.60 and 4.35 ft. were obtained for width, height and sidewalls, respectively. In all pens, the simple linear regression was not significant (p<0.05), with the coefficient of determination ranging from 0.001 (SO2) to 0.364 (CO). For the different aerial pollutant gases, the best linear predictor was for CO using height of building followed by SO2 using height and so on based on the R2 values. Even though this study returned low levels of gases for the area during the month of August, there is the need to extend the study to other periods of the year especially the dry season months in other to further elucidate the effects of inclement whether on gas concentrations in pig pens.
 
 
 
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