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Articles by O.J. Ajanusi
Total Records ( 5 ) for O.J. Ajanusi
  N.P. Chiezey , O.J. Ajanusi and E.O. Oyedipe
  Reproductive performance of a flock of 63 ewes carrying natural infections of gastrointestinal worm burdens was studied. Parameters monitored included: ovarian activity through progesterone profiles, parturition intervals, birth weights, mortality rates of offspring and worm burdens through faecal egg counts. Mean lamb birth weight was 2.6±0.48, litter size was 1.1 lambs and up to 50% of the ewes lambed two or more times within the 18 month period. Twining rate was 6%, with 4.5% abortions and a mortality rate of 37% up to three months of age. There were significantly less lambs born in the late wet season, than any other season, lambing percentages being 9.9, 23.3, 25.9 and 38% for the late wet, late dry, early wet and early dry seasons, respectively. Mean lambing intervals was 192±7.5 days in 17% of ewes and 220±10.4 days in another 34.8% of the animals. The remaining 47.8% had mean LI of between 250-349 days. EPG was significantly lower (p<0.05) in ewes with mean LI of 192 days (5025EPG) but was not significantly different in ewes with longer LI. EPG ranged from 13011 to 16317 in these groups. Progesterone profiles showed that long lambing intervals was due to delayed resumption of ovarian activity post partum. In addition to seasonal variation in availability of quantity and quality of feed, helminthosis may have an effect on reproductive efficiency in sheep, mediated mainly through effects on body condition which ultimately affects re-breeding intervals.
  C.I. Ogbaje , E.O. Agbo and O.J. Ajanusi
  A survey was conducted to determine the prevalence of gastrointestinal helminthes in local chickens, broilers and layers slaughtered in Makurdi metropolis between September 2007 and April 2008. A total of 440 samples were collected from male and female chickens. Of the total samples examined, 200(45.5%) were from domestic chicken, 140(31.8%) from broilers and 100(22.7%) from layers. Of the total sample examined, 280(63.6%) were infected with one or more species of helminthes. Of the number positive for infections, 103(23.4%) had single infection, 105(23.9%) double infections and 60(13.6%) triple infections. Overall, 165(37.5%) of the samples had Ascaridia galli, 122(27.7%) had Heterakis gallinarum and 214(48.6%) had various tapeworm species. Out of the 200 samples from domestic chickens, 110(55%) were found infected with Ascaridia galli, 80(40%) with Heterakis gallinarum and 145(72.5%) with different tapeworm species. Of the 140 gastrointestinal tracts from broilers, 50(35.7%) were infected with Ascaridia galli, 40(28.6%) with Heterakis gallinarum and 60(42.9%) with various tapeworm species. Out of the 100 gastrointestinal tracts from layers, 5(5%) were infected with Ascaridia galli, 2(2%) with Heterakis gallinarum and 9(9%) with various tapeworm species. The species of tapeworm encountered were Raillietina species, Choanotaenia species and Hymenolepis species. These respective species constitute 30.9%, 5.2% and 3.6% of the tapeworm burdens. This study has highlighted the need for proper medication in flocks in Makurdi.
  K.H. Yusuf , O.J. Ajanusi , A.I. Lawal , L. Saidu and I.D. Jatau
  This study was conducted to determine the effects of experimental Ascaridia galli infection on the body weight (BW), packed cell volume (PCV) and total plasma protein (TP) of Hovad and Anak breeds of broilers. One hundred day old broiler chicks (50 for each breed) were divided into two subgroups (1-2) containing 25 birds per group of each breed. Subgroups 1 of each breed were infected with 500 infective eggs of A. galli at 3 weeks of age and subgroups 2 served as uninfected (Negative) controls. BW, PCV and TP values were determined and clinical signs observed weekly for 8 weeks post infection. Statistical analysis of data was performed using one way analysis of variance (ANOVA). Values of p<0.05 were considered as statistically significant. Results revealed decrease in mean values of the body weight gain, PCV and total plasma proteins in the infected groups of both breeds compared to the negative controls. The differences observed were however, not statistically significant, in both breeds at p>0.05 and values of p<0.05 were considered as statistically significant. A. galli infection had transient effect on BW, PCV and TP of infected birds.
  K.L. Adang , S.J. Oniye , A.U. Ezealor , P.A. Abdu and O.J. Ajanusi
  A total of 240 (127 males and 113 females) domestic pigeons (Columba livia domestica Linnaeus) purchased from Samaru and Sabon-Gari markets in Zaria, were examined by plumage brushing for ectoparasites. One hundred and seventy-seven (73.8%) of the birds were infested by five species of ectoparasites. The ectoparasites comprised lice: 15 (6.3%) Menopon gallinae, 153 (63.8%) Columbicola columbae and 26 (10.8%) Goniodes sp.; flies: 89 (37.1) Pseudolynchia canariensis and 6 (2.5%) of mites (Dermanyssus gallinae). Seventy-four (30.8%) of the domestic birds had single infestation, 95 (39.6%) had double infestation and 7 (2.9%) had triple infestation. The difference between single and mixed infestation was not statistically significant (p>0.05). The females had a higher prevalence 84 (74.3%) than the males 93 (73.2%). There was however no significant difference (p>0.05) in the infestation rates between the sexes. Ectoparasites were removed from the birds through out the year with highest prevalence (95%) in August. Columbicola columbae and Pseudolynchia canariensis were collected through out the year.
  S.O. Okaiyeto , O.J. Ajanusi , A.K. Sackey and L.B. Tekdek
  An experimental study on joint infection with Trypanosoma congolense (Tc) and Haemonchus contortus (Hc) was conducted in 30 female Yankassa sheep aged between 12 and 25 months, divided into 5 groups of 6 animals (TcHc, HcTc, Hc, Tc and control). Two groups received a single infection with either H. contortus or T. congolense and two other groups were infected with T. congolense followed by H. contortus (TcHc) in one and H. contortus followed by T. congolense (HcTc) in the other. One group was kept as uninfected control. All the trypanosome-infected groups (Tc, TcHc, HcTc) showed different prepatent periods, the Tc group was patent at day 10 post-infection (pi), while TcHc and HcTc were patent at day 5 and 7 pi, respectively. High mean parasiteamia was observed during the acute phase of the infection in the trypanosome infected groups, which declined during the chronic phase giving mean parasitaemic scores of 3.2±0.1 and 0.3±0.1. There was a rapid fall in the Packed Cell Volume (PCV) of the TcHc group, which reaches a minimum decline at day 25 pi. It was also observed that higher faecal egg count corresponded to decrease in PCV. All the Haemonchus infected groups developed higher eosinophils values, which was indicative of the activities of tissue invading helminthes.
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