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Articles by O.A. Ojo
Total Records ( 4 ) for O.A. Ojo
  M. Orunmuyi , I.A. Adeyinka , O.A. Ojo and F.D. Adeyinka
  One hundred and eleven litter records obtained from the mating of 8 bucks to 22 does of a non-descript population were used to provide estimates of heritability and genetic correlations for pre-weaning litter traits. Least square means and standard errors for fur score, litter size at birth, litter size at weaning and weaning weight were: 30.3±0.17, 3.72±0.12, 4.8±0.12, 3.6±0.14 and 480.70±22.43 g, respectively. The least square analysis of variance revealed that most of the productive traits studied exerted significant effect on weaning weight with the exception of litter size at birth and gestation length. Heritability estimates obtained for gestation length, fur score, litter size at birth, litter size at weaning and weaning weight were 0.60±0.39, 1.46±0.56, 1.09±0.51, 1.49±0.59 and 1.07±0.51, respectively. Genetic correlations were high and positive in most cases with the exception of correlations between gestation length and weaning weight and litter size at weaning and weaning weight which were negative. Phenotypic correlations were also high and positive in most cases except for gestation length and fur score and gestation length and weaning weight which were negative.
  T.I. Olabiyi , E.E.A. Oyedunmade , G.J. Ibikunle , O.A. Ojo , G.O. Adesina , K.A. Adelasoye and T.A. Ogunniran
  Laboratory experiments were conducted on the effect of leaf extract of some weeds on root knot nematode, Meloidogyne incognita and also on the chemical compounds in the leaf extract of some weeds. Leaf extracts were obtained from Sida acuta Burm F., Euphorbia hirta Linn Andropogon gayanus Kunth, Phyllanthus amarus Schum and Thomm and Cassia obtusifolia L. weeds. Distilled water and ethanol (95%) were used as the extraction media for nematode bio-assay and phyto-chemical analysis experiments, respectively. Concentrations of each leaf extract of the weed were 5, 10, 15 and 20% (w/v). Approximately, 100 M. incognita juveniles were dispensed into each Petri-dish containing the graded weed extracts, while M. incognita juveniles that were dispensed into distilled water only served as control. Each treatment, including the control, was replicated 10 times. M. incognita juvenile mortality rate increased with an increase in test plant extract concentrations and exposure time. In 15 and 20% (w/v) concentrations of Euphorbia hirta, Phyllanthus amarus and Cassia obtusifolia and 20% (w/v) concentration of Sida acuta and Andropogon gayanus, there was 100% M. incognita juvenile mortality by the 7th day. The result of phyto-chemical analysis revealed that Euphorbia hirta contained tannins, saponins, flavonoids and alkaloids; Andropogon gayanus contained saponins, flavonoids and alkaloids; Cassia obtusifolia contained tannins, flavonoids and alkaloids; Phyllanthus amarus contained tannins, saponins, flavonoids and alkaloids while Sida acuta contained tannins, saponins, flavonoids and sterols chemical compounds.
  O.A. Ojo , T.A. Adebayo and O.A. Olaniran
  The biological response of bacteria, actinomycetes, fungi and protozoan to four fungicides (Phenyl mercuric acetate, pentachloro-nitrobenzene, benomyl and captan) was investigated in a garden soil treated with three different rates of these fungicides. The microbial populations were estimated at different days after treatment using the standard dilution plate-count technique. Phenyl mercuric acetate completely inhibited the soil bacteria and fungi at all rates of application up till 33 Days After Treatment (DAT), after which recolonization of the soil occurred. The significantly (p 0.05) highest bacteria population of 22.11 x10 cfu g-1 and 16.03x10 cfu g-1 of actinomycetes population in soil was observed in the soil samples treated with benomyl at the application rate of 225.0 ìg g-1 and 63DAT when compared with that of untreated soil sample. Pentachloro Nitrobenzene (PCNB) gave significantly lowest (p 0.05) population of actinomycetes (0.03x10 cfu g-1) and protozoan (0.0x10 cfu g-1) compared to all other treatments throughout the period of study. The actinomycetes population in the captan and ceresan treated soils sample increases with days after treatment. In general, fungi and protozoa were more susceptible to fungicides than bacteria and actinomycetes. Phenyl mercuric acetate and pentachloro-nitrobenzene were more toxic particularly to soil, micro organisms, compared to benomyl and captan. The significant effects of fungicides on soil microbial population is here in discussed.
  T.A. Adebayo , O.A. Ojo and O.A. Olaniran
  Two insecticides were applied separately to the soil at 4000 and 8000 ppm for thiodan® and 6000 and 12000 ppm for karate®, respectively. Their effects were investigated at 0, 14, 21, 28, 35, 42 and 49 Days after Treatment (DAT) on the population of bacteria, fungi, actinomycetes and protozoa in the soil. The microbial population was estimated using the standard dilution plate technique. The two insecticides investigated at both rates of application significantly (p 0.05) reduced the fungi, actinomycetes and protozoa population in the soil. Whereas the bacteria population was significantly (p 0.05) increased. Thiodan at the rate of 8000 ppm gave significantly (p 0.05) lowest population of fungi in the soil compared to actinomycetes and protozoa population. A progressive increase in the soil microbial population for various insecticidal treatments in the order of 49DAT > 35DAT >28DAT > 21DAT > 14DAT > 0DAT was observed. The significance of thiodan and karate insecticide at two different rates of application on the soil microbial population is herein discussed.
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